spectral characteristics of protons in the earth's plasmasheet: statistical results from cluster cis and rapid
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ID: 248421
2010
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Abstract
We present a study of the spectral characteristics of
protons in the Earth's plasma sheet for various geomagnetic disturbance levels. The study is
based on about 5400 h of data combined from the Cluster RAPID and CIS
instruments obtained during the tail season (July–October). The overall proton spectral shape
is generally that of a κ distribution, that is, resembling a Maxwellian at lower energies
which smoothly merges into a power-law tail at higher energies.
The actual spectral long-term slope depends on various magnetospheric driver parameters,
but is on average around 3.5–4. During disturbed conditions, such as geomagnetic storm
or substorm periods, a shift in the characteristic energy is observed. For two individual storms,
we also found a hardening of the spectra.
Unlike the electron spectra, we do not see any significant local time dependence in the spectral slope,
but we find higher average ion fluxes in the dusk side.
We also do not find any direct response in the energy spectra to changes in the interplanetary
magnetic field or solar wind dynamic pressure. This suggests that energization of
the ions are mainly due to internal processes in the plasma sheet.
| Reference Key |
haaland2010annalesspectral
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|---|---|
| Authors | ;S. Haaland;S. Haaland;E. A. Kronberg;P. W. Daly;M. Fränz;L. Degener;E. Georgescu;I. Dandouras |
| Journal | journal of food measurement and characterization |
| Year | 2010 |
| DOI |
10.5194/angeo-28-1483-2010
|
| URL | |
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