Computer Science – Sound
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9114b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Oct. 1, 1984, p. 9114-9118. Research supported by the U.S. Defense Nu
Computer Science
Sound
39
Auroral Zones, Birkeland Currents, Electron Precipitation, Ionospheric Currents, Satellite Sounding, Atmospheric Turbulence, Electric Fields, F Region, Magnetic Signatures, Oxygen Ions, Vertical Motion
Scientific paper
The HILAT spacecraft magnetometer registered an intense Birkeland current at 850 km altitude in July 1983. The satellite also carried a VUV auroral image mapper and an ion drift meter. The 94 micro-A/sq m current was at the equatorward edge of the earthward directed current in the late evening sector. The VUV data showed that the current was imbedded in the diffuse aurora. Energetic electrons of 20 eV-20 keV increased in flux by more than two orders of magnitude in 0.75 sec. Strong ion turbulence was detected 10 km horizontally on either side of the current. An electron flux of 60 bilion/sq cm per sec is estimated, strong enough to destabilize 0(+) ion cyclotron waves, along with a 30 km/sec drift velocity sufficient for inciting current convective instabilities when associated with an F region density gradient.
Bythrow Peter F.
Hanson William B.
Hardy David A.
Huffman Robert E.
Meng Ching I.
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