Variatons of Geomagnetic Responses and Low-Altitude Radiation Belt Enviroment During Extreme Storm Events

Details Variatons of Geomagnetic Responses and Low-Altitude Radiation Belt Enviroment During Extreme Storm Events Variatons of Geomagnetic Responses and Low-Altitude Radiation Belt Enviroment During Extreme Storm Events

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm41a..07s&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM41A-07

Computer Science

Performance

2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

The October-November 2003 Sun-Earth connection events produced huge geomagnetic storms (Dst as low as -400 nT) and enhancements of the Earth's radiation belt. Using the newly developed Magnetospheric State Quer System (MSQS, http://radbelts.gsfc.nasa.gov), we have identified several additional storm events (July, 1982; September, 1982; March, 1989; October, 1989; March, 1991; November, 1991; July, 2000, March, 2001 and November, 2001) which reached similar magnitude in Dst, i.e. consecutive Dst < -250 nT for more than 5 hours. Using the low-altitude radiation environment data obtained continuously by NOAA POES satellites for more than 20 years, we can study the behaviors of the low-altitude electron and proton belts during these extreme storm events, and contrast them with their quiet-time behaviors. Some events, e.g. March, 1989 and March, 1991, show formation of new proton belts. The formation and enhancement of new proton belts (L less than 2.5) in NOAA POES/MEPED enery channels (0.25 MeV to 80 MeV) will be shown and the decay-time (over years) of the proton belt inferred from these past events will be discussed. Transient evolution of electron belt at energy channels (100 keV and 300 keV) during these extreme condition events will be shown with regard to the variations of the Dst index and other magnetospheric state parameters. Common features and distiguished characteristics in the radiation belt behavior during these extreme storm events will be discussed. In addition, we will apply the recently developed magnetospheric state-based model [Fung and Shao, 2005] to prescribe the geomagnetic responses (AL, Kp, Dst) during the October-November 2003 event using the data from past extreme condition events and assess the model performance. Fung, Shing F., and Xi Shao, Magnetospheric State Specification, submitted to J. Geophys. Res., 2005.

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