The statistical character of Pc 4 magnetic pulsations at synchronous orbit

Details The statistical character of Pc 4 magnetic pulsations at synchronous orbit The statistical character of Pc 4 magnetic pulsations at synchronous orbit

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.1325a&link_type=abstract

Journal of Geophysical Research, vol. 86, Mar. 1, 1981, p. 1325-1334.

Computer Science

Sound

35

Geomagnetic Micropulsations, Magnetospheric Instability, Satellite Sounding, Statistical Analysis, Synchronous Satellites, Ats 6, Geophysics, Histograms

Scientific paper

A statistical study of 215 magnetic pulsation events identified on the basis of waveform and period as Pc 4 (45- to 150-s period) observed at synchronous orbit by ATS 6 is reported. The study was designed to be similar to that done with Pc 3 (10- to 45-s period) by Arthur et al. (1977). These Pc 4 are found to occur most often near 1800 local time but are observed at all local times. The dominant period is approximately 100 s, but a secondary peak in the distribution occurred at approximately 53 s. They tend to be nearly linearly polarized, principally transverse to the ambient magnetic field. The Pc 4 are found to divide naturally into two classes (radial and azimuthal) on the basis of the azimuth of the major axis of polarization. These classes divide further into low-frequency (less than or equal to 0.015 Hz) and high-frequency (greater than or equal to 0.015 Hz) classes. These four classes organize the remaining wave characteristics quite well. Division of the Pc 4 events into these classes does not lead to identification of a single source mechanism as it did with Pc 3. However, some correspondence between the classes and various proposed mechanisms does exist.

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