Seasonal variation of amplitude of geomagnetic sudden commencements near midnight at geostationary orbit

Details Seasonal variation of amplitude of geomagnetic sudden commencements near midnight at geostationary orbit Seasonal variation of amplitude of geomagnetic sudden commencements near midnight at geostationary orbit

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..205n&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, Feb. 1986, p. 205-217.

Computer Science

8

Annual Variations, Geomagnetism, Geosynchronous Orbits, Magnetospheric Instability, Satellite Observation, Sudden Storm Commencements, Geomagnetic Tail, Night Sky

Scientific paper

Using digital magnetic data from the geostationary satellites of SMS/GOES series, the amplitude of geomagnetic sudden commencements (SCs) observed near midnight was examined and a seasonal variation for it was confirmed. SC amplitude normalized by the value at Honolulu is smaller in Northern Hemisphere winter than in summer. Variations from a steady state before an SC to a quasi-steady state soon after the SC tend to be positive for horizontal and vertical components and inclination in summer, while those tend to be negative in winter. These variations seem to be related with the seasonal variation of position of the neutral sheet in the magnetospheric tail and a shift of the sheet at disturbed times. Magnetic field caused by near-earth tail currents is calculated on the assumption of a cylindrical magnetotail. The results show that both the magnetopause surface currents and the tail currents contribute to SC amplitude near midnight, and the seasonal variation is mainly caused by the variation of position and the shift of the neutral sheet.

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