A modulated multiband Pc1 event observed by POLAR/EFI around the plasmapause

Details A modulated multiband Pc1 event observed by POLAR/EFI around the plasmapause A modulated multiband Pc1 event observed by POLAR/EFI around the plasmapause

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..24...81m&link_type=abstract

Advances in Space Research, Volume 24, Issue 1, p. 81-84.

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Scientific paper

We study an electromagnetic ion cyclotron (EMIC) wave event observed simultaneously by the Electric Field Instrument (EFI) on board the POLAR spacecraft and by the Finnish pulsation magnetometer chain on April 25, 1997, when the two were in a good conjunction. EFI recorded waves at two frequency bands from L = 4.3 (in the outer plasmasphere) to L=6.2 (just outside the plasmapause). Both bands were observed in several conjugate stations on ground. The waves showed repetitive variations in amplitude, corresponding to classical Pc1 pearls. The repetition period was the same on ground and in space. Moreover, the repetition period of Pc1 pearls coincided with the period of simultaneous Pc4 waves observed by POLAR and on ground. The observations suggest that Pc1 pearls (EMIC waves in general) are modulated by Pc4 waves rather than result from the bouncing of a wave packet from one hemisphere to another.

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