AMPTE CCE observations of Pi 2 pulsations in the inner magnetosphere

Journal Article · Fri Jul 24 04:00:00 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), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 19:14; ISSN GPRLAJ; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

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