Detailed correlations of magnetic field and riometer observations at L = 4.2 with pulsating aurora

Details Detailed correlations of magnetic field and riometer observations at L = 4.2 with pulsating aurora Detailed correlations of magnetic field and riometer observations at L = 4.2 with pulsating aurora

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....8710449a&link_type=abstract

Journal of Geophysical Research, vol. 87, Dec. 1, 1982, p. 10449-10456. Research supported by the Lockheed Independent Research

Physics

35

Auroral Spectroscopy, Geomagnetic Pulsations, Ionospheric Currents, Particle Precipitation, Cosmic Noise, D Region, Extremely Low Radio Frequencies, Picosecond Pulses, Riometers

Scientific paper

Pi 1 magnetic pulsations in the period range 5-15 s recorded on the ground at L = 4.2 during pulsating aurora are studied using data collected at Siple Station, Antarctica, in 1979. Pulsating aurora exceeding 200 R of 4278-A emission occurred for approximately 5% of the 1400 hours of photometer operation and in all cases was accompanied by ULF waves. A singular characteristic of the ULF waves is a strong westward component in the derivative of B with respect to t during the auroral light bursts. A detailed correlation of the ULF waves with riometer and flux gate magnetic field data shows that the magnetic field variations were very closely correlated with D region cosmic noise absorption. Asymmetric pulsations derive from the slow recovery of the magnetic field, they occurred when the auroral light pulses were of short duration. It is concluded that the ground Pi 1 recorded during pulsating aurora at L = 4.2 were due to an overhead current system produced by the particle precipitation. It is thought that the characteristic westward component in the derivative of B with respect to t could be interpreted as being due to an equatorially directed local ionospheric current driven by a polarization electric field.

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