Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33a0426m&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM33A-0426
Other
2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2774 Radiation Belts, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
It has been known that CMEs and CIRs are two major solar wind drivers of geomagnetic storms. The primary parameter to control the ring current evolution is the southward component of the IMF. On the other hand, it is considered that the solar wind speed is a primary parameter to control the formation of the radiation belts. The solar wind speed and IMF are not independent but related via inherent plasma properties of the solar wind structures such as CMEs and CIRs. In this study, we identify a total of 78 isolated storm events with Dst < -100 nT during solar cycle 23. We categorize these storms into three groups in terms of the solar wind driver of the main phase; storms with Dst > -130 nT associated with CIRs, storms with Dst > -130 nT driven by CMEs, and CME-driven great storms with Dst < -130 nT. The superposed epoch analysis is performed for energetic particle data obtained from GOES and NOAA/POES satellites together with solar wind data obtained from Wind and ACE spacecraft. As the result, it is evident that the energetic particles at inner and outer parts are sensitive to different solar wind structures. The flux enhancements of radiation belt electrons and ring current ions at L > 3.5 during the recovery phase largely depend on the solar wind structures; CIRs are significantly more effective for the evolution of the outer belt than CMEs. A series of particle injections is important for the evolution of the outer belt, which are driven by Alfvén waves within the fast coronal hole stream following the CIR, and it is shown that only the fast solar wind speed is not sufficient condition for the flux enhancement. On the other hand, the flux enhancements of radiation belt electrons and ring current ions at L < 3.0 largely depend on the strength of storms; only particular CMEs with a huge motional electric field and large dynamic pressure are effective to increase radiation belt electrons and ring current ions at L < 3.0.
Kataoka Ryuho
Miyoshi Y. S.
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