Substorm Local Time and Compositional Characteristics During the April, 2002 Geomagnetic Storms

Details Substorm Local Time and Compositional Characteristics During the April, 2002 Geomagnetic Storms Substorm Local Time and Compositional Characteristics During the April, 2002 Geomagnetic Storms

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0440m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0440

Other

2704 Auroral Phenomena (2407), 2784 Solar Wind/Magnetosphere Interactions, 7513 Coronal Mass Ejections

Scientific paper

The geomagnetic storm associated with the solar events of April 14-21, 2002 is characterized by substorm activity of a nature probably restricted to particular storm conditions. The substorm dipolarization during the main phase of this storm acts more or less globally. The geosynchronous geomagnetic field appears to dipolarize almost simultaneously on the nightside and the dayside. The geosynchronous particle detectors also show simultaneous injections over almost the entire local time range. As long as the IMF Bz is negative the injections reccur with a 2-3 hour period and display a `sawtooth' like injection pattern in the LANL particle data [G. Reeves]. Global energetic neutral atom (ENA) images from the HENA imager onboard IMAGE display almost global enhancements of ENA fluxes at each of these events, implying that this is a more global depolarization than the classical picture provides. Furthermore, the ENA enhancements are much more prominent in energetic (50 to 180 keV) oxygen, than in hydrogen. Ground magnetometer data is under investigation for this type of event [Kitamura et al., this conference]. In this presentation we will use the global energetic neutral atom (ENA) images from the HENA imager on board IMAGE together with ground magnetometer data and other datasets (Geosynchronous magnetic field and particles, aurora, plasmasphere) to discuss the global signatures of this phenomenon.

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