Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..297f&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 297-300.
Physics
15
Birkeland Currents, Earth Magnetosphere, Exos Satellites, Exos-D Satellite, Field Aligned Currents, Ionospheric Currents, Electron Cyclotron Heating, Electron Precipitation, Plasma Waves
Scientific paper
The EXOS-D fluxgate magnetometer data obtained at 3000-10,000 km altitude have shown that small-scale field-aligned currents always exist in large-scale region 1, region 2, cusp and polar cap current systems. Assuming that these small-sale field-aligned currents have current sheet structure, the width of current sheet is estimated to be 5-20 km at ionospheric altitude. By comparing the magnetometer data with charged particle and high frequency plasma wave data simultaneously obtained from EXOS-D, it is found that small-scale currents have one-to-one correspondence with localized electron precipitation events characterized by flux enhancement over a wide energy range from 10 eV to several keV and broadband electrostatic bursts occasionally extending above local plasma frequencies or electron cyclotron frequencies.
Fujii Ryoichi
Fukunishi Hiroshi
Kokubun Susumu
Mukai Tadashi
Tohyama Fumio
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