On the relationship between morning sector irregular magnetic pulsations and field aligned currents

Details On the relationship between morning sector irregular magnetic pulsations and field aligned currents On the relationship between morning sector irregular magnetic pulsations and field aligned currents

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.1602e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, March 1, 1984, p. 1602-1612. Navy-NASA-supported research.

Physics

8

Birkeland Currents, Field Aligned Currents, Geomagnetic Micropulsations, Ionospheric Currents, Magnetic Disturbances, Correlation, Magnetometers, Magsat Satellites, Picosecond Pulses, Riometers

Scientific paper

For three magnetically disturbed days in early 1980, data from south polar masses of the Magsat satellite are compared with data from search coil magnetometer, riometer, and photometer instrumentation at Siple, Antarctica. It is found that during each Magsat polar pass in the morning sector, the level of Pi 1 activity correlates well with the intensities of three-dimensional current systems. Fine structure is often observed in the field-aligned currents during periods of intense Pi activity. Among the Birkeland currents are 2-s to 10-s (16-80 km) structured perturbations; these are evident in the transverse components of the field and are thought to indicate filamentary currents. Pi 1 amplitudes are found to be considerably larger when region 2 Birkeland currents are overhead than when they are not. In one case, detailed features are identified in the high-resolution Magsat magnetic field data that may be current fluctuations related to asymmetric Pi 1.

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