ICME polarity: it's origins and effects on the magnetosphere, and STEREO's potential for resolving key problems

Details ICME polarity: it's origins and effects on the magnetosphere, and STEREO's potential for resolving key problems ICME polarity: it's origins and effects on the magnetosphere, and STEREO's potential for resolving key problems

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm22a..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM22A-01

Physics

2784 Solar Wind/Magnetosphere Interactions, 7513 Coronal Mass Ejections (2101), 7954 Magnetic Storms (2788)

Scientific paper

The importance of southward magnetic fields within and around interplanetary coronal mass ejections (ICMEs) for the geospace responses is well known. For example, southward fields in the shocked sheath region preceding the ICME driver or ejecta can lead to a rapid storm onset following the sudden commencement rather than a delayed onset. These are the simplest fields in the ICME to understand and predict because they are the piled-up fields of the ambient solar wind for which pre-ICME measurements exist and fairly accurate models have been developed. However, the sheath field often fluctuates between Northward and Southward due to the presence in the ecliptic of the heliospheric current sheet, and the sheath is normally of shorter duration than the ejecta that follows. The ~1-2 day long ejecta passage produces the steadier, and often highest magnitude north-south fields in an ICME. These have the potential to produce the greatest magnetospheric effects. We show some results from CISM numerical experiments demonstrating the geospace importance of understanding the source of ejecta southward fields. We also show how solar observations and models are being used to investigate this question. New observations from STEREO, coupled with those from SOHO, Solar-B, ACE and WIND, will give a multipoint perspective on the roles of various coronal field structures, the details of the photospheric field evolution, and the ambient solar wind in the generation of geoeffective ICMEs.

Affiliated with

Also associated with

No associations

Rating

ICME polarity: it's origins and effects on the magnetosphere, and STEREO's potential for resolving key problems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ICME polarity: it's origins and effects on the magnetosphere, and STEREO's potential for resolving key problems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ICME polarity: it's origins and effects on the magnetosphere, and STEREO's potential for resolving key problems will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-970892