Geomagnetic Storms Driven by CIRs as Seen by the TWINS ENA Imagers

Details Geomagnetic Storms Driven by CIRs as Seen by the TWINS ENA Imagers Geomagnetic Storms Driven by CIRs as Seen by the TWINS ENA Imagers

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23b1704p&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM23B-1704

Physics

2720 Energetic Particles: Trapped, 2764 Plasma Sheet, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Geomagnetic storms in the Earth's magnetosphere are predominately driven by either interplanetary coronal mass ejections (ICMEs) or corotating interaction regions (CIRs). ICMEs tend to be the dominate driver for storms during solar maximum, while CIRs are the dominate driver during solar minimum. CIRs are formed by the interaction between fast and slow solar wind streams and tend to corotate with the Sun. CIR-driven storms are often identified by their weak Dst perturbations and 27-day occurrence pattern. A series of small CIR-driven storms with an unusual storm sudden commencement (SSC) were identified during the TWINS science mission (June 2008 through September 2008). Observations from the TWINS energetic neutral atom (ENA) imagers are presented, giving a global perspective of storm-time dynamics within the magnetosphere during these CIR-driven storms.

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