A statistical study of unstable particle populations in the global ringcurrent and their relation to the generation of high ULFwaves.

Details A statistical study of unstable particle populations in the global ringcurrent and their relation to the generation of high ULFwaves. A statistical study of unstable particle populations in the global ringcurrent and their relation to the generation of high ULFwaves.

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004angeo..22.4229b&link_type=abstract

Annales Geophysicae, vol. 22, Issue 12, pp.4229-4241

Physics

6

Scientific paper

The first statistical study of the unstable proton populations which contain ``free energy" required to drive small-scale poloidal mode ULF waves in the magnetosphere between L-shell locations of 6 and 9 is presented. The data examined are all in the form of Ion Distribution Functions (IDFs) covering a particle energy range of 0.025keV to 328keV, amassed over 2.5 years from the TIMAS and CAMMICE (MICS) instruments on-board the Polar spacecraft. Any free energy which is available to drive a resonant wave mode manifests itself as a positive gradient region in the IDF. A new analysis technique applied to the data, allows for the first time, the amount of free energy contained in each IDF to be quantified. The results show that IDFs are a common occurrence in the magnetosphere at these L-shells, although they are most common in the dawn/pre-noon sector. Lower energy (10-45keV) protons are the most commonly observed unstable populations and also contain the largest amounts of free energy (>1010J). Positive gradient regions at higher energies (>100keV) are rarely observed and also contain greatly reduced free energies (<109J).

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