Waves in the Magnetic Field and Solar Wind Flow Outside the Bow Shock at Comet Halley

Details Waves in the Magnetic Field and Solar Wind Flow Outside the Bow Shock at Comet Halley Waves in the Magnetic Field and Solar Wind Flow Outside the Bow Shock at Comet Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.277j&link_type=abstract

The Exploration of Halley's Comet. Volume 1: Plasma and Gas, Proceedings of the 20th ESLAB Symposium held in Heidelberg, West Ge

Astronomy and Astrophysics

Astronomy

1

Scientific paper

An investigation of the low frequency waves, upstream from the bow shock, has been carried out using data from the JPA and MAG instruments on Giotto. The former obtains a snapshot of the solar wind distribution every two spins of the spacecraft, i.e. 8 s. From this data the components of the flow velocity, density and temperature of both protons and alpha particles can be obtained. To compare with these data the magnetic field components, obtained at a rate of 28 values-per-second, have been averaged over the same period of 8 secs. The two data sets can be used to study frequencies up to 60 milliherz, well above the H2O+ gyrofrequency at 6 milliherz, but below the proton gyrofrequency of 100 milliherz.

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