Fast magnetic fluctuations in the solar wind - HELIOS I

Details Fast magnetic fluctuations in the solar wind - HELIOS I Fast magnetic fluctuations in the solar wind - HELIOS I

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.3201n&link_type=abstract

Journal of Geophysical Research, vol. 82, Aug. 1, 1977, p. 3201-3212. Research supported by the Bundesministerium für Forschung

Physics

6

Helios 1, Interplanetary Medium, Magnetic Variations, Solar Wind, Low Noise, Magnetic Signatures, Oblique Shock Waves, Power Spectra, Satellite-Borne Instruments, Waveguides, Whistlers

Scientific paper

The Helios search coil experiment provides accurate low-background-noise measurements of interplanetary-magnetic-fluctuation spectra from about 4 Hz to 2.2 kHz adjacent to the frequency band from 0 to 4 Hz of a flux-gate magnetometer. Apart from a slowly varying fluctuation component ranging up to 100 Hz near 1 AU and beyond 500 Hz near 0.3 AU, the following superposed 'events' can be discerned in the fluctuation spectra which also have a distinct signature in the slowly varying magnetic field: (1) directional discontinuities acting as waveguide boundaries; (2) directional discontinuities producing whistler wave fields because of instability; (3) reversible magnetic-field variations, mostly dips of about 1-min duration associated with whistler wave fields; and (4) interplanetary shocks, where, for example, the oblique shock of January 8, 1975, has a thickness of about 1 proton gyroradius and produces an increase in whistler wave fields by more than 2 orders of magnitude in power spectral density, leading to a specific power spectrum in the wake region.

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