The aurora and particle fluxes during the large January 21, 2005 geomagnetic storm

Details The aurora and particle fluxes during the large January 21, 2005 geomagnetic storm The aurora and particle fluxes during the large January 21, 2005 geomagnetic storm

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm51a..01f&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM51A-01

Other

2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms

Scientific paper

The geomagnetic storm on January 21, 2005 was special and different from other storms that an unusual large amount of ions were precipitated into the upper atmosphere. The proton aurora imager SI-12 on the NASA IMAGE spacecraft observed the strongest proton aurora signal since the beginning of the mission in May 2000. The storm started at 17:12 when a large solar wind dynamic pressure pulse must have hit the magnetopause thereby creating a subauroral proton flash. Within 2 minutes the whole southern auroral oval increased in brightness and rapidly expanded into the previously empty polar cap. The cusp signature is consistent with a southward IMF at the beginning of the storm. After a perigee pass IMAGE-FUV observed the later stage of the storm after 23:00 with a strong cusp signal during northward IMF. At the same time the FAST satellite observed unusually large fluxes of precipitating ions in the cusp, while the NOAA satellites detected large fluxes of ion and electron precipitation on the dayside and unusual energies on the nightside. The presentation will describe the auroral morphology and compare the auroral brightness with the low altitude in-situ measurements of partiucle fluxes. We will also compare the temporal evolution with other geomagnetic storms during the IMAGE mission.

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