Monday, December 7, 2015
December 4th, 2015
Space Weather Message Code: WATA20
Issue Time: 2:31 PM
Geomagnetic Storm Category G1
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, such as northern Michigan and Maine.
Space Weather Message Code: ALTEF3
Issue Time: 7:26 AM
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Begin Time: 11:10 AM
Yesterday Maximum 2MeV Flux: 1538 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Solar Wind Speeds: 367.3 km/sec
K-index: 1
Space Weather Message Code: WATA20
Issue Time: 2:31 PM
Geomagnetic Storm Category G1
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, such as northern Michigan and Maine.
Space Weather Message Code: ALTEF3
Issue Time: 7:26 AM
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Begin Time: 11:10 AM
Yesterday Maximum 2MeV Flux: 1538 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Solar Wind Speeds: 367.3 km/sec
K-index: 1
December 3rd, 2015
Space Weather Message Code: WATA20
Issue Time: 2015 Dec 03 1902 UTC
Geomagnetic Storm Category: G1
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: ALTEF3
Issue Time: 9:06 AM
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2279
Begin Time: 11:10 AM
Yesterday Maximum 2MeV Flux: 1421 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Solar Wind Speeds: 370.1 km/sec
K-index: 1
Space Weather Message Code: WATA20
Issue Time: 2015 Dec 03 1902 UTC
Geomagnetic Storm Category: G1
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: ALTEF3
Issue Time: 9:06 AM
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2279
Begin Time: 11:10 AM
Yesterday Maximum 2MeV Flux: 1421 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Solar Wind Speeds: 370.1 km/sec
K-index: 1
December 2nd, 2015
Space Weather Message Code: ALTEF3
Issue Time: 11:27 AM
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Intensity Reached: 11:10 AM
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Solar Wind Speeds: 410.1 km/sec
K-index: 2
Space Weather Message Code: ALTEF3
Issue Time: 11:27 AM
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Intensity Reached: 11:10 AM
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Solar Wind Speeds: 410.1 km/sec
K-index: 2
Tuesday, December 1, 2015
December 1st, 2015
Solar Wind Speeds: 554.3 km/sec
K-index: 3
Space Weather Message Code: WARK04
Issue Time: 10:14 AM
WARNING: Geomagnetic K-index of 4
Valid From: 10:15 AM
Valid To: 2:00 PM
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia
Induced Currents - Weak changes in power grids
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: SUM10R
Issue Time: 5:28 AM
Begin Time: 3:08 PM
Maximum Time: 3:09 PM
End Time: 3:09 PM
Duration: 1 minute
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
Solar Wind Speeds: 554.3 km/sec
K-index: 3
Space Weather Message Code: WARK04
Issue Time: 10:14 AM
WARNING: Geomagnetic K-index of 4
Valid From: 10:15 AM
Valid To: 2:00 PM
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia
Induced Currents - Weak changes in power grids
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: SUM10R
Issue Time: 5:28 AM
Begin Time: 3:08 PM
Maximum Time: 3:09 PM
End Time: 3:09 PM
Duration: 1 minute
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
Sunday, November 29, 2015
November 30th, 2015
Space Weather Message Code: ALTK04
Issue Time: 7:03 PM
Intensity Reached: 6:59 PM
Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
ftp://ftp.swpc.noaa.gov/pub/alerts/current_month.html
Solar Wind Speeds: 440.5 km/sec
K-index: 3/4
Sunspots:
Coronal Holes:
Space Weather Message Code: ALTK04
Issue Time: 7:03 PM
Intensity Reached: 6:59 PM
Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
ftp://ftp.swpc.noaa.gov/pub/alerts/current_month.html
Solar Wind Speeds: 440.5 km/sec
K-index: 3/4
Sunspots:
Coronal Holes:
November 29th, 2015
Space Weather Message Code: WARK04
Issue Time: 6:23 PM
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
K-index: 3/4
Solar Wind Speeds: 440.5 km/sec
Coronal Mass Ejection:
Frosty Moon:
Space Weather Message Code: WARK04
Issue Time: 6:23 PM
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
K-index: 3/4
Solar Wind Speeds: 440.5 km/sec
Coronal Mass Ejection:
Frosty Moon:
Auroras:
November 28th, 2015
Space Weather Message Code: WATA20
Issue Time: 3:44 PM
Geomagnetic Storm: G1-minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
www.swpc.noaa.gov/noaa-scales-explanation
Coronal Holes:
Solar Flares:
Space Weather Message Code: WATA20
Issue Time: 3:44 PM
Geomagnetic Storm: G1-minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
www.swpc.noaa.gov/noaa-scales-explanation
Coronal Holes:
Solar Flares:
November 25th, 2015 (Thanksgiving)
Alert: NOAA forecasters estimate a 40% chance in a geomagnetic storm when solar winds hit Earth's magnetic field.
K-index: 1
Solar Wind Speeds: 253.6 km/sec
Full Moon
"The glory"- softly colored rings around the shadow of an airplane.
Atmospheric optics expert Les Cowley explains what causes it: "These rings are formed when light is scattered backwards by individual water droplets in the clouds. The more uniform the size of the droplets, the more rings you will see. They swell and contract as you travel over clouds with smaller or larger droplets."
Alert: NOAA forecasters estimate a 40% chance in a geomagnetic storm when solar winds hit Earth's magnetic field.
K-index: 1
Solar Wind Speeds: 253.6 km/sec
Full Moon
"The glory"- softly colored rings around the shadow of an airplane.
Atmospheric optics expert Les Cowley explains what causes it: "These rings are formed when light is scattered backwards by individual water droplets in the clouds. The more uniform the size of the droplets, the more rings you will see. They swell and contract as you travel over clouds with smaller or larger droplets."
Space Weather Storms
Coronal Mass Ejections (CMEs): Massive bursts of highly charged particles (neutrons, protons, and heavy nuclei) from the sun's corona. The corona is the outermost layer of the sun.
Geomagnetic Storms: A temporary disturbance of the Earth's magnetic field (magnetosphere). It is caused by solar winds that strike the Earth's magnetosphere.
Coronal Holes: Coronal holes are part of the Sun's corona and are constantly changing and reshaping because the corona is not uniform. Coronal holes are areas where the Sun's corona is darker, and colder, and has lower-density plasma than average because there is lower energy and gas levels. -https://en.wikipedia.org/wiki/Coronal_hole
Coronal Mass Ejections (CMEs): Massive bursts of highly charged particles (neutrons, protons, and heavy nuclei) from the sun's corona. The corona is the outermost layer of the sun.
Geomagnetic Storms: A temporary disturbance of the Earth's magnetic field (magnetosphere). It is caused by solar winds that strike the Earth's magnetosphere.
Coronal Holes: Coronal holes are part of the Sun's corona and are constantly changing and reshaping because the corona is not uniform. Coronal holes are areas where the Sun's corona is darker, and colder, and has lower-density plasma than average because there is lower energy and gas levels. -https://en.wikipedia.org/wiki/Coronal_hole
November 22nd, 2015
Solar Wind Speeds: 327.7 km/sec
K-index: 1
A coronal mass ejection (CME) erupted in the southeastern quadrant of the sun. Here is a video from SOHO. This CME is not headed towards Earth.
Solar Wind Speeds: 327.7 km/sec
K-index: 1
A coronal mass ejection (CME) erupted in the southeastern quadrant of the sun. Here is a video from SOHO. This CME is not headed towards Earth.
November 21st, 2015
Asteroid Encounter -7.4 LD
K-index: 1
Solar Wind Speeds: 360.4 km/sec
A quiet day in space weather. There were no intense solar flares, CMEs or geomagnetic storms. But auroras appeared anyway.
Aurora:
Asteroid Encounter -7.4 LD
K-index: 1
Solar Wind Speeds: 360.4 km/sec
A quiet day in space weather. There were no intense solar flares, CMEs or geomagnetic storms. But auroras appeared anyway.
Aurora:
November 20th, 2015
Solar activity: Very low. There are only two sunspot groups on the Earthside of the sun
K-index: 1
Solar Wind Speeds: 414.5 km/sec
Sunspots:
http://spaceweather.com/archive.php?view=1&day=20&month=11&year=2015
Solar activity: Very low. There are only two sunspot groups on the Earthside of the sun
K-index: 1
Solar Wind Speeds: 414.5 km/sec
Sunspots:
http://spaceweather.com/archive.php?view=1&day=20&month=11&year=2015
Thursday, November 19, 2015
November 19th 2015
Space Weather Message Code: WARK04
Issue Time: 4:58 PM
WARNING: Geomagnetic K-index of 4 expected
Valid From: 4:00 PM
Valid to: 11:00 AM
Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: WARK04
Issue Time: 4:54 PM
WARNING: Geomagnetic K-index of 4 expected
Valid From: 4:00 PM
Valid to: 11:00 AM
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
http://sohowww.nascom.nasa.gov/spaceweather/

Space Weather Message Code: WARK04
Issue Time: 4:58 PM
WARNING: Geomagnetic K-index of 4 expected
Valid From: 4:00 PM
Valid to: 11:00 AM
Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: WARK04
Issue Time: 4:54 PM
WARNING: Geomagnetic K-index of 4 expected
Valid From: 4:00 PM
Valid to: 11:00 AM
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
http://sohowww.nascom.nasa.gov/spaceweather/

Wednesday, November 18, 2015
November 18, 2015
Space Weather Message Code: ALTK05
Issue Time: 6:09 PM
ALERT: Geomagnetic K-index of 5 (minor storm).
Intensity Reached: 6:08 PM
Active Warning: Yes
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: WARK05
Issue Time: 5:52 PM
WARNING: Geomagnetic K-index of 5 expected
Valid From: 6:00 PM
Valid To: 2:00 AM
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: ALTK04
Issue Time: 5:07 PM
ALERT: Geomagnetic K-index of 4
Intensity Reached: 5:07 PM
Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: WARK04
Issue Time: 4:00 PM
WARNING: Geomagnetic K-index of 4 expected
Valid From: 4:00 PM
Valid To: 5:00 PM
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: ALTK05
Issue Time: 6:09 PM
ALERT: Geomagnetic K-index of 5 (minor storm).
Intensity Reached: 6:08 PM
Active Warning: Yes
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: WARK05
Issue Time: 5:52 PM
WARNING: Geomagnetic K-index of 5 expected
Valid From: 6:00 PM
Valid To: 2:00 AM
NOAA Scale: G1 - Minor
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska. Also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: ALTK04
Issue Time: 5:07 PM
ALERT: Geomagnetic K-index of 4
Intensity Reached: 5:07 PM
Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: WARK04
Issue Time: 4:00 PM
WARNING: Geomagnetic K-index of 4 expected
Valid From: 4:00 PM
Valid To: 5:00 PM
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents - Weak changes in power grids.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
November 17, 2015
Space Weather Message Code: WATA20
Issue Time: 2:30 AM
WATCH: Geomagnetic Storm Category G1 Predicted.
Geomagnetic storm category: G1 (minor)
Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska and also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: WATA20
Issue Time: 7:17 PM
Geomagnetic Storm Category: G1
Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska and also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: WATA20
Issue Time: 2:30 AM
WATCH: Geomagnetic Storm Category G1 Predicted.
Geomagnetic storm category: G1 (minor)
Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska and also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
Space Weather Message Code: WATA20
Issue Time: 7:17 PM
Geomagnetic Storm Category: G1
Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Latitude Range: South of Alaska and also cuts through Canada and Russia.
Induced Currents - Weak changes in power grids.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes such as northern Michigan and Maine.
November 16, 2015
Space Weather Message Code: ALTEF3
Issue Time: 6:45 PM
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Yesterday Maximum 2MeV Flux: 2087 pfu
Impact: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Space Weather Message Code: ALTK04
Issue Time: 10:10 PM
ALERT: Geomagnetic K-index of 4
Intensity Reached: 9:59 AM
Active Warning: Yes
Potential Impacts: Area of impact is primarily 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents: Weak changes in power grids.
Aurora Activity: Aurora may be visible at high latitudes such as Canada and Alaska.
Space Weather Message Code: ALTEF3
Issue Time: 6:45 PM
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Yesterday Maximum 2MeV Flux: 2087 pfu
Impact: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Space Weather Message Code: ALTK04
Issue Time: 10:10 PM
ALERT: Geomagnetic K-index of 4
Intensity Reached: 9:59 AM
Active Warning: Yes
Potential Impacts: Area of impact is primarily 65 degrees Geomagnetic Latitude.
Latitude Range: Alaska to parts of Russia.
Induced Currents: Weak changes in power grids.
Aurora Activity: Aurora may be visible at high latitudes such as Canada and Alaska.
Tuesday, November 17, 2015
Terms
K-index: Used to characterize the magnitude of geomagnetic storms.
G-Scale: The geometric scale
Solar Radiation Storms
Radio Blackouts
Electron Flux Alert
The total number of lines of force passing through the unit area of a surface held perpendicularly. They follow a strong diurnal (daily) cycle due to the geometry of Earth's magnetic field. Maximum values generally occur near local noon locations on the daytime side of the Earth.
Plaque-forming unit (PFU) is a measure of the number of particles capable of forming plaques per unit volume, such as virus particles.
MeV- million electron volts
World Map with latitude and longitude lines
ftp://ftp.swpc.noaa.gov/pub/alerts/current_month.html
K-index: Used to characterize the magnitude of geomagnetic storms.
G-Scale: The geometric scale
Solar Radiation Storms
Radio Blackouts
Electron Flux Alert
The total number of lines of force passing through the unit area of a surface held perpendicularly. They follow a strong diurnal (daily) cycle due to the geometry of Earth's magnetic field. Maximum values generally occur near local noon locations on the daytime side of the Earth.
Plaque-forming unit (PFU) is a measure of the number of particles capable of forming plaques per unit volume, such as virus particles.
MeV- million electron volts
- 10 MeV Warning: Issued when flux levels above 10 pfu are predicted.
- 10 MeV ALERTS: Issued when flux level exceeding 10, 100, 1,000, 10,000, or 100,000 pfu confirmed.
- 10 MeV Proton Event Summary: Issued when 10 MeV flux levels make a confirmed drop below S-Scale . Includes date/times for begining and end.
- 100 MeV Flux ALERT: Issued when flux level exceeding 1 pfu.
- 100 MeV Proton Event Summary: Issued when 100 MeV flux level makes confirmed drop below 1 pfu threshold.
World Map with latitude and longitude lines
ftp://ftp.swpc.noaa.gov/pub/alerts/current_month.html
Subscribe to:
Posts (Atom)