Transient magnetic field signatures at high latitudes
- Johns Hopkins Univ., Laurel, MD (United States)
We survey GOES 2/5/6 geosynchronous and Huancayo, Peru, ground magnetometer observations at the times of 70 transient (2-10 min) events recorded at South Pole Station, Antarctica. The simultaneous observations indicate that most South Pole events correspond to sudden sharp variations in the equatorial magnetospheric and low-latitude ground magnetic field. The exceptions occur when the South Pole events have weak amplitudes and/or Huancayo and GOES 2/5/6 are far from local noon. The corresponding features observed at GOES 5 and GOES 6 are generally similar, with a lag indicating antisunward motion. A similar antisunward motion may be inferred from the ground observations themselves. On a case-by-case and statistical basis, the characteristics of the events observed in South Pole ground magnetograms resemble those previously interpreted as sudden impulse and sudden storm commencement signatures at other high-latitude stations. These observations suggest that the transient events at South Pole form part of the magnetospheric and ionospheric response to a sudden change in the fraction of the solar wind dynamic pressure applied to the magnetosphere. 57 refs., 14 figs.
- OSTI ID:
- 6821153
- Journal Information:
- Journal of Geophysical Research; (United States), Vol. 98:A1; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
ANTARCTICA
GEOMAGNETIC FIELD
STATISTICAL MODELS
PERU
SOLAR WIND
PRESSURE GRADIENTS
MAGNETOMETERS
STORMS
ANTARCTIC REGIONS
DEVELOPING COUNTRIES
DISASTERS
LATIN AMERICA
MAGNETIC FIELDS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
POLAR REGIONS
SOLAR ACTIVITY
SOUTH AMERICA
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)