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If you are looking for the official U.S. Government forecast for space weather, please go to NOAA's Space Weather Prediction Center (http://swpc.noaa.gov). This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly.

Notifications & Analysis

Weekly Space Weather Report for April 25 - May 1, 2012

## Message Type: Weekly Space Weather Summary Report for April 25, 2012 - May 1, 2012
##
## Message Issue Date: 2012-05-02T22:05:00Z
## Report Coverage Begin Date: 2012-04-25T00:00:00Z
## Report Coverage End Date: 2012-05-01T23:59:59Z
## Message ID: 20120502-7D-001

## Summary:

Solar activity was at low levels for this reporting period with the largest flare event being the M1.0 class one peaked at 2012-04-27T08:24Z.

CME may impact Messenger and STEREO A

## NASA Goddard Space Flight Center, Space Weather Center ( SWC )
## Message Type: Space Weather Alert - CME
##
## Message Issue Date: 2012-04-30T15:45:00Z
## Message ID: 20120430-AL-001

## Alert Summary:

Type C CME detected by STEREO-A COR2 / STEREO-B COR2 / SOHO LASCO C3.

Start time of the event: 2012-04-30T07:48Z.

Estimated speed: ~ 960 km/s.

Estimated opening half-angle: 40 deg.

Direction (LONG/LAT): 85./-34. in Heliocentric Earth Ecliptic coordinates.

Weekly Space Weather Report, April 18-24, 2012

## 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).

Arrival Time of Earth-directed CME Updated

## NASA Goddard Space Flight Center, Space Weather Center ( SWC )
## Message Type: Space Weather Alert
##
## Message Issue Date: 2012-04-25T19:05:00Z
## Message ID: 20120425-AL-001

## Alert Summary:

Update on CME with the activity ID 2012-04-23T18:09:00-CME-001 (see alert 20120423-AL-001). Based on revised heliospheric modeling carried out at NASA GSFC Space Weather Center, it is estimated that the CME may impact the Earth earlier than predicted previously. Simulations indicate that the leading edge of the CME will reach the Earth at the revised arrival time of 2012-04-26T12:13Z (plus minus 7 hours). The roughly estimated expected range of the Kp index is 3-5 (minor).

Updated type C CME parameters are :

Start time of the event: 2012-04-23T18:09Z.

Estimated speed: ~800 km/s.

Estimated opening half-angle: 23 deg.

Geomagnetic Storm Today

## NASA Goddard Space Flight Center, Space Weather Center ( SWC )
## Message Type: Space Weather Alert
##
## Message Issue Date: 2012-04-24T04:10:00Z
## Message ID: 20120424-AL-001

## Alert Summary:

Ongoing space weather storm in the Earth's magnetosphere. Geomagnetic Kp index has reached level 6 (moderate) starting at 2012-04-24T00:00Z.
The storm is caused by arrival of the CME with ID 2012-04-19T15:39:00-CME-001 (see alert 20120420-AL-001). The arrival of IP shock due to the CME arrival was observed by ACE at 2012-04-23T02:27Z.
Spacecraft at GEO, MEO, polar and other orbits passing through or in the vicinity of the Earth's ring current and auroral regions can be impacted.

CME Headed Toward Messenger Spacecraft

## NASA Goddard Space Flight Center, Space Weather Center ( SWC )
## Message Type: Space Weather Alert - CME
##
## Message Issue Date: 2012-04-22T22:30:00Z
## Message ID: 20120422-AL-001

## Alert Summary:

Type C CME detected by SOHO LASCO C2 / STEREO-A COR2 / STEREO-B COR2.

Start time of the event: 2012-04-22T15:12Z.

Estimated speed: ~646 km/s.

Estimated opening half-angle: 39 deg.

Direction (lon./lat.): 88/-46 in Heliocentric Earth Ecliptic coordinates.

Multiples CME's Detected

## NASA Goddard Space Flight Center, Space Weather Center ( SWC )
## Message Type: Space Weather Alert - CMEs
##
## Message Issue Date: 2012-04-20T01:25:00Z
## Message ID: 20120420-AL-001

## Alert Summary:

A series of CMEs have been detected:
1) Type C CME detected by STEREO-B COR2 / SOHO LASCO C3.

Start time of the event: 2012-04-18T18:24Z.

Estimated speed: ~500 km/s.

Estimated opening half-angle: 30 deg.

Direction (lon./lat.): 25/-22 in Heliocentric Earth Ecliptic coordinates.

2) Type C CME detected by STEREO-A COR2 / STEREO-B COR2.

Start time of the event: 2012-04-19T15:39Z.

Estimated speed: ~650 km/s.

Estimated opening half-angle: 25 deg.

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