AMPTE CCE observations of Pi 2 pulsations in the inner magnetosphere

Journal Article · Fri Jul 24 00:00:00 EDT 1992 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/92GL01283· OSTI ID:7174729

Takahashi, Kazue; Ohtani, Shinichi ^[1]; Yumoto, Kiyohumi ^[2]

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1. Johns Hopkins Univ., Laurel, MD (United States)
2. Nagoya Univ., Aichi (Japan)

Magnetic field data acquired with the AMPTE Charge Composition Explorer satellite in the inner magnetosphere (L = 2-5) often show Pi 2 pulsations whose waveforms match Pi 2 pulsations simultaneously observed on the ground at Kakioka (L = 1.2). From a study of 25 such events, the authors find that the magnetic pulsations in the equatorial magnetosphere are dominated by poloidal-mode oscillations. The relative phase between the compressional component at CCE and the horizontal component at Kakioka is either near zero or near 180[degree], with the [approximately] 180[degree] lag observed only when the satellite is at L > 3. This observation implies that there is a node of a radial standing wave at L > 3. They argue that the nodal structure arises from reflection of MHD fast-mode waves at some inner boundary of the magnetosphere and discuss the relevance of the nodal structure to cavity-mode resonances and oscillations in the inner magnetosphere forced by a source wave external to the inner magnetosphere.

• OSTI ID: 7174729
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Vol. 19:14; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EARTH MAGNETOSPHERE
HYDROMAGNETIC WAVES
DATA ANALYSIS
DETECTION
GEOMAGNETIC FIELD
MAGNETOTAIL
ORIGIN
OSCILLATION MODES
PULSATIONS
RESONANCE
SATELLITES
WAVE FORMS
EARTH ATMOSPHERE
MAGNETIC FIELDS
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)