Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm31a..03s&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM31A-03
Physics
2716 Energetic Particles: Precipitating, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
The precipitation of energetic ions and electrons into the upper atmosphere is a direct manifestation of their acceleration and pitch angle scattering in the magnetosphere. Electric fields inject/convect the particles from the tail plasma sheet towards the earth, and when closer to the Earth they spread in local time due to magnetic field forces. The electrons drift towards the morning sector and the ions towards the evening sector thus creating the RC (ring current). Certain aspects of the RC behaviour can be revealed by the precipitating energetic protons and electrons. From the protons a proxy for the energy injection rate into the RC can be estimated, and a RC-index which correlates highly with the pressure corrected Dst* can be calculated. In the injection/main phase of the storm the spatial structure of the RC in the midnight/evening MLT-sector can be inferred from the precipitation at high latitudes. The magnetic field at the Earth's surface exhibits an appreciable Magnetic Local Time (MLT) dependence in the initial and main phase of the storm. The field depression is very asymmetric, with the largest depression in the evening to midnight MLT sector. During such storms a well defined Storm Time Equatorial Belt (STEB) of Energetic Neutral Atoms (ENA) and ions is found to exist at low altitudes around geomagnetic equator. Ring Current (RC) asymmetry and symmetry inferred from the STEB are in accordance with results from ground based magnetic observations. There is, however, also a difference. The magnetic observations show the storms to be worldwide, displaying essential the same signature all around the equator. The STEB is not worldwide it appears first in the midnight/evening sector and then it appears in the morning sector largely consistent with the drift of the RC ions.
Søraas Finn
Sørbø M.
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