Physics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..990s&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 11/12, p. 990-1010
Physics
6
Planetary Boundary Layer, Planetary Magnetic Fields, Plasma Density, Plasma Sheaths, Shock Waves, Explorer 50 Satellite, Propagation Velocity, Satellite Observation, Solar Wind
Scientific paper
A Pc 5-type pulsation (T approximately = 6 min) event, which persisted for approximately 19 h on 15-16 February 1978, was observed by the IMP-8 spacecraft inside the dusk low-latitude boundary layer (LLBL), while at the same time the ISEE-1 spacecraft was in the dawn LLBL or the nearby plasma sheet, and the IMP-7 spacecraft was upstream of the Earth's bow shock. The waves are observed as mixed mode compressional and transverse Pc 5 pulsations in the magnetic field, and are also often observed in the plasma density, plasma velocity and energetic ion intensities. The dynamic pressure on the magnetosphere is reduced abruptly and the pulsations occur simultaneously with the new magnetospheric configuration. The geomagnetic activity remains extremely low during the event, following a preceding disturbed period. Under such circumstances our major findings are the following: (1) the frequency of the dawn LLBL waves is twice (f approximately = 5 mHz) the frequency of the pulse trains at the duskside LLBL; (2) the magnetic field amplitude peaks in the LLBL coincide with plasma density maxima and plasma velocity minima; (3) the magnitude of the magnetic field and the energetic ion fluxes are anticorrelated; (4) the thickness of the LLBL on the plane Z(sub GSM) = 0 and at X approximately = 19 R(sub E) is estimated to be approximately 6.5 R(sub E) throughout the event; (5) the dusk LLBL and the dawn sector plasma sheet reveals Pc 5-type magnetic field pulsations at the same time, and furthermore, inside the plasma sheet the amplitude of the Pc 5 waves modulates the coexisting Pc 3 mode signals in the form of wave packets. The second harmonic of the magnetic field magnitude at ISEE-1 is interpreted as a spatial feature limited to the close vicinity of the plane Z(sub GSM) = 0. Candidate excitation mechanisms of the Pc 5 pulsations are proposed.
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