Physics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2447e&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2447-2456. Research supported by NASA.
Physics
34
Frequency Modulation, Geomagnetic Micropulsations, Interplanetary Magnetic Fields, Ionospheric Disturbances, Polar Cusps, Extremely Low Frequencies, Frequency Ranges, Very Low Frequencies
Scientific paper
Search coil magnetometer, riometer, photometer, and ELF-VLF receiver data obtained at South Pole Station and McMurdo, Antarctica during selected days in March and April 1986 are compared. Narrow-band magnetic pulsations in the Pc 3 period range are observed simultaneously at both stations in the dayside sector during times of low IMF cone angle, but are considerably stronger at South Pole, which is located at a latitude near the nominal foot point of the dayside cusp/cleft region. Pulsations in auroral light at 427.8 nm wavelength are often observed with magnetic pulsations at South Pole, but such optical pulsations are not observed at McMurdo. The observations suggest that precipitating magnetosheathlike electrons at nominal dayside cleft latitudes are at times modulated with frequencies similar to those of upstream waves. These particles may play an important role, via modification of ionospheric currents and conductivities, in the transmission of upstream wave signals into the magnetosphere and in the generation of dayside high-latitude Pc 3 pulsations.
Anderson Benjamin J.
Arnoldy Roger L.
Cahill Laurence J. Jr.
Engebretson Mark J.
Rosenberg T. J.
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