Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42c06w&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM42C-06
Physics
2716 Energetic Particles, Precipitating, 2778 Ring Current, 2788 Storms And Substorms
Scientific paper
On August 6, 1998, a magnetic storm occurred with a minimum Dst of 138 nT. Pitch angle distributions of the ring current ions were obtained with the SEPS/CEPPAD charged particle spectrometer on the NASA POLAR satellite during its passes through the radiation belt region. When SEPS was oriented parallel to the geomagnetic field, SEPS measured the downward and upward ion fluxes inside the loss cones with an angular resolution of about 1.5 deg. During the day following minimum Dst fluxes of 155 keV ions were observed inside the downward loss cone, comparable in intensity to the trapped fluxes measured at equatorial pitch angles of 50 deg. The distributions within the loss cone were uniform, suggesting that strong diffusion was occurring equatorward of the satellite latitude of 45 deg. At L values between 4 and 5 the scattering was strong enough to dominate the losses of ring current ions. During the early recovery phase of the storm the precipitation was greater in the afternoon sector (16:00 MLT) than in the morning sector (4:00 MLT).
Voss Henry D.
Walt Martin
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