AMPTE CCE observations of Pc 3-4 pulsations at L = 2-6

Details AMPTE CCE observations of Pc 3-4 pulsations at L = 2-6 AMPTE CCE observations of Pc 3-4 pulsations at L = 2-6

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9517179t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Oct. 1, 1990, p. 17179-17186.

Physics

37

Ampte (Satellites), Geomagnetic Micropulsations, Lagrangian Equilibrium Points, Satellite Observation, Magnetoelastic Waves, Plasma Density, Resonance, Toroids

Scientific paper

Magnetic field data acquired by the AMPTE CCE satellite from L = 2-6 are analyzed. A procedure was specially developed to reduce the artificial modulation and noise in magnetic field measurements, making it possible to detect Pc 3-4 pulsations with amplitudes only 1 nT or less, even for L values less than 3. A survey of 41 CCE passes in L = 2-6 and in the postnoon sector showed that the most commonly observed pulsations in this region were the east-west oscillations of magnetic field with clearly L-dependent frequencies; these are identified as the toroidal mode standing Alfven waves. A relationship was found between the pulsation frequency and plasma density, showing that the pulsation data can be used to estimate the plasma mass density in the inner magnetosphere.

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