Physics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009plst...11..539h&link_type=abstract
Plasma Science and Technology, Volume 11, Issue 5, pp. 539-543 (2009).
Physics
1
Scientific paper
The gyroresonant interaction between electromagnetic ion cyclotron (EMIC) waves and energetic particles was studied in a multi-ion (H+, He+, and O+) plasma. The minimum resonant energy Emin, resonant wave frequency ω, and pitch angle diffusion coefficient Dαα were calculated at the center location of the symmetrical ring current: r approx 3.5RE with RE the Earth's radius. Emin is found to decrease rapidly from 10 MeV to a few keV with the increase in Ω in three bands: H+-band, He+-band and O+-band. Moreover, EMIC waves have substantial potential to scatter energetic (~100 keV) ions (mainly H+ and He+) into the loss cone and yield precipitation loss, suggesting that wave-particle interactions contribute to ring current decay.
Chen Liangxu
He Huiyong
He Yihua
Li Yajie
Nie Liuying
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