Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13a1205a&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM13A-1205
Physics
2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2722 Forecasting, 2778 Ring Current, 2788 Storms And Substorms
Scientific paper
The dynamics of the ring current ions are studied in detail by using the observations of the NOAA/POES satellites (N15, N16, N17) from 2001 until now. These satellites observe energetic (keV - MeV) particles at altitudes of about 800 km and across the magnetic footprint of the ring current region. The orbit of three satellites can cover all magnetic local times (MLT) during a storm event. From the two-dimensional statistical analysis, we have confirmed that the ring current ions observed by the P0 (30-80 keV) channel show asymmetric distribution. The time variation of the ion flux during magnetic storm appears as intensity and special variation. Intensity of the ion flux shows MLT asymmetry; strongest in the pre-midnight sector (20-24 MLT). The flux in the post-midnight sector (0-4 MLT) tends to intense rather than that in the dusk sector (16-20 MLT). In comparison with the post-midnight sectors, the flux enhancement is very weak in the dawn and pre-noon sector (4-8 and 8-12 MLT) during storm times. The timing of ion flux enhancement during storm time is typically as the following: the ions in the pre-midnight sector increase firstly (in the initial phase) at about L = 6 and those in the post-noon sector increase finally (in the main phase). In the main phase, the peak flux of the ions is at about L = 4. In the recovery phase the ion fluxes in the all sectors decrease while these latitudes (L-values) increase. However, such asymmetric distribution still remains after the storm event. Even during non-storm period, the ring current ions exist in the pre-midnight and its neighbor sectors at L = 5 to 7. Only during Kp < 1 (very quiet period) such asymmetry disappears. This suggests that substorm injection play a role of ion distribution during non-storm time. The relationship between asymmetry of ring current ions and that of magnetic field variations observed on the ground will be discussed in this presentation.
Asai K. T.
Miyoshi Yasunobu
Nagatsuma Tadao
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