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Weekly Space Weather Report, April 18-24, 2012

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## Message Type: Weekly Space Weather Summary Report for April 18, 2012 - April 24, 2012
##
## Message Issue Date: 2012-04-25T21:07:00Z
## Report Coverage Begin Date: 2012-04-18T00:00:00Z
## Report Coverage End Date: 2012-04-24T23:59:59Z
## Message ID: 20120425-7D-001

## Summary:

Solar activity was at moderate levels with only C and B-class flares. There were a few type C CMEs (500-1000km/s, see list below).

Geomagnetic activity was at low to moderate levels, with the Kp index (a measure of geomagnetic activity, ranging 0-9) <=6, but mostly between 2 and 3 throughout the week. The Kp index reached 6 (moderate storm, Activity ID 2012-04-24T00:00:00-GST-001, see alert 20120424-AL-001) on 2012-04-24T0:00Z to 03:00Z due to arrival of a CME (activity ID 2012-04-19T15:39:00-CME-001, see alert 20120420-AL-001). The arrival of interplanetary shock due to the CME arrival was observed by ACE at 2012-04-23T02:27Z. The flank of another CME caused Kp to increase again to 5 during 2012-04-24T21:00Z- 23:59Z.

The >0.8 MeV energetic electron flux at GEO increased remained below alert threshold levels (10^5 pfu) throughout the week.

There were no energetic proton events during the reporting period.

Space weather impact:

Spacecrafts in the path of the Earth directed CME (Activity ID 2012-04-23T18:09:00-CME-001, see alert 20120423-AL-001) could be impacted. Space weather impact is likely to have been small for the reporting week.

## Events:

Flares (M class and above):
None

CMEs (> 500 km/s):

Earth directed:
Starting time Speed (km/s) Direction (LON/LAT in HEE) Angular width (degrees) Detecting spacecraft (real-time)
2012-04-18T18:24Z ~ 500 25/-22 60 SOHO, STEREO B
2012-04-19T15:39Z ~ 650 -18/-28 50 STEREO A and B
2012-04-19T16:54Z ~ 535 -60/-34 64 STEREO A and B
2012-04-22T15:12 ~ 646 88/-46 78 SOHO, STEREO A and B
2012-04-23T18:09Z ~ 590 -13/-16 23 STEREO A and B
2012-04-24T08:12Z ~ 500 -60/10 30 STEREO A and B

Non-Earth directed:
Starting time Speed (km/s) Direction (LON/LAT in HEE) Angular width (degrees) Detecting spacecraft (real-time)
2012-04-18T02:48Z ~580 -147/12 48 SOHO, STEREO A, and B

2012-04-18T09:09Z ~700 -157/13 54 STEREO A and B

2012-04-18T14:54Z ~890 -158/10 44 STEREO A and B
2012-04-20T03:24Z ~600 175/13 76 SOHO, STEREO A and B

## Spacecraft Anomalies Reported to SWC:

None.

## Space Weather Outlook:
## Outlook Coverage Begin Date: 2012-04-25T00:00:00Z
## Outlook Coverage End Date: 2012-05-01T23:59:59Z

The solar and geomagnetic activity is expected to be low to unsettled levels for the upcoming week.

## Notes:
Video versions of the weekly reports are available at http://www.youtube.com/playlist?list=PL577C998181394F97

For questions, comments, requests etc. contact: GSFC-Space-Weather-Center

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