Plasmaspheric depletion and refilling associated with the September 25, 1998 magnetic storm observed by ground magnetometers at  L  = 2 | Zendy

Chi P. J. | Zendy; Russell C. T. | Zendy; Musman S. | Zendy; Peterson W. K. | Zendy; Le G. | Zendy; Angelopoulos V. | Zendy; Reeves G. D. | Zendy; Moldwin M. B. | Zendy; Chun F. K. | Zendy

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Plasmaspheric depletion and refilling associated with the September 25, 1998 magnetic storm observed by ground magnetometers at L = 2

Author(s) -

Chi P. J.,

Russell C. T.,

Musman S.,

Peterson W. K.,

Le G.,

Angelopoulos V.,

Reeves G. D.,

Moldwin M. B.,

Chun F. K.

Publication year - 2000

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/1999gl010722

Subject(s) - plasmasphere , magnetometer , geomagnetic storm , geophysics , storm , latitude , atmospheric sciences , tec , convection , geology , magnetosphere , polar cap , physics , magnetic field , ionosphere , solar wind , meteorology , geodesy , quantum mechanics

The plasmaspheric mass density at L ≃ 2 was monitored by two IGPP/LANL ground magnetometer stations during the magnetic storm on September 25, 1998. Even at this low latitude the plasma density dropped significantly to ≃ 1/4 of the pre‐storm value. The total electron content (TEC) inferred by GPS signals also shows a sizable decrease during the storm. The observations suggest that the convection caused by the strong electric field associated with the magnetic storm eroded the plasmasphere as low as L = 2, which is a much lower latitude than that expected from the estimated potential drop across the polar cap together with a simple model of the magnetospheric convection pattern.

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