Longitudinal extension of the substorm-associated long-period hydromagnetic waves

Details Longitudinal extension of the substorm-associated long-period hydromagnetic waves Longitudinal extension of the substorm-associated long-period hydromagnetic waves

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..210w&link_type=abstract

Journal of Geophysical Research, vol. 83, Jan. 1, 1978, p. 210-214.

Physics

Geomagnetic Latitude, Magnetic Signatures, Magnetohydrodynamic Waves, Polar Substorms, Geomagnetic Tail, Plasma Oscillations

Scientific paper

A recent study has shown that long-period hydromagnetic waves exist at middle- and low-latitude stations prior to and/or simultaneously with polar substorms. The latitude-independent characteristics of the waves have led to the suggestion that the plasmasphere oscillates as a resonant cavity; their longitudinal extension is examined to see whether their activities are spatially localized. Magnetograms recorded at 19 stations in an east-west chain situated along a geomagnetic latitudinal circle of about 49 deg in the Northern Hemisphere were collected. For waves with a period of about 30 min occurring prior to a substorm, the longitudinal range is about 240 deg, starting clockwise from the 0400 meridian to the noon meridian. For waves with a longer period, of the order of 2 hours, which occurred simultaneously with the substorm, a much smaller longitudinal range (about 90 to 100 deg) is observed on the nightside. This localized character of long-period hydromagnetic waves suggests that they are a result of magnetotail oscillations.

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