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Type R CME (reclassified as type ER) arrives at STEREO A


NOAA's Space Weather Prediction Center (http://swpc.noaa.gov) is the United States Government official source for space weather forecasts. This "Experimental Research Forecast" is a preliminary NASA research product and should be interpreted and used accordingly.

## NASA Goddard Space Flight Center, Space Weather Research Center ( SWRC )
## Message Type: Experimental Research Forecast
##
## Message Issue Date: 2012-07-23T23:50:00Z
## Message ID: 20120723-AL-005

## Summary:

Update on CME with ID 2012-07-23T02:36:00-CME-001 (see message 20120723-AL-003 / 20120723-AL-004).

CME with ID 2012-07-23T02:36:00-CME-001 arrived at STEREO A around 2012-07-23T19:30Z.
The flux of 13 - 100 MeV protons enhanced and peaked to 454 pfu/MeV (more than 100, 000 times of its nominal background level, which is about 2.*10^-3 pfu/MeV) around 2012-07-23T20:52Z due to this CME arrival.

Considering its arrival time, the initial speed of CME could be around 3400 km/s.

## Notes:

CME with ID 2012-07-23T02:36:00-CME-001 is classified as type ER.

Data and simulation for the event: http://bit.ly/20120723-STEREOA-CME-AC

NASA missions STEREO A and Dawn that are in the direct path of the CME are most likely to experience the siginificantly enhanced radiation conditions due to the combination of the CME and flare activity (from the old active region 1520). The same space weather event has also resulted in a minor SEP event in the near Earth's environment.

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