STEREO small ICME activity and the connection to the large-scale coronal structure during the solar activity minimum

Details STEREO small ICME activity and the connection to the large-scale coronal structure during the solar activity minimum STEREO small ICME activity and the connection to the large-scale coronal structure during the solar activity minimum

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh21a..06h&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH21A-06

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2169 Solar Wind Sources, 7507 Chromosphere, 7513 Coronal Mass Ejections (2101), 7524 Magnetic Fields

Scientific paper

We have investigated ICME activity during the solar activity minimum from March 2007 to December 2007 using observations from the STEREO and Wind spacecraft. During this period the angular separation of the twin STEREO satellites increased from about 1 to 44 degrees while Wind was located at the L1 point. At solar minimum the interplanetary medium is dominated by recurrent high-speed streams, but slow solar wind frequently includes ICME events. These slow ICMEs tend to have shorter durations and weaker magnetic fields than typical ICMEs at 1 AU. We will discuss the properties of these small ICMEs and their scale-sizes. In addition we will relate the ICMEs to the large-scale coronal structure using the GONG magnetogram synoptic maps. We also discuss the possible connection of these events to the transient outflows from coronal streamers identified originally by SOHO/LASCO and currently observed by the STEREO/SECCHI imagers.

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