Concerning the ionospheric modification of magnetospheric hydromagnetic waves: Case studies

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA092iA11p12213· OSTI ID:5940038

Glassmeier, K H ^[1]; Junginger, H ^[2]

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1. Univ. Muenster (West Germany)
2. Max-Planck-Inst. fuer Extraterrestrische Physik, Garching (West Germany)

Correlated ground magnetic and geostationary satellite electric field measurements of four ULF pulsation events occurring at different local times within the Earth's magnetosphere are analyzed with special emphasis on the influence of the ionosphere on ground-based observations. Using a simplified rule for the projection of the electric field observations down to the ionosphere, the authors find two occasions where the ionospheric rotation angle is about 90{degree} and two occasions where it significantly deviates from this value. A possible explanation of these results is given in terms of a recently developed theory concerning the influence of an ionosphere with arbitrary nonuniform horizontal conductivity distribution and in terms of propagation of hydromagnetic waves in noncoplanar magnetic field geometries. The need for further study of this latter point is strongly emphasized.

• OSTI ID: 5940038
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 92:A11; ISSN JGREA; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATIONS
DATA ANALYSIS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
GROUND LEVEL
HYDROMAGNETIC WAVES
IONOSPHERE
LEVELS
MAGNETIC FIELDS
PHYSICAL PROPERTIES
PLANETARY IONOSPHERES
WAVE PROPAGATION