Physics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..417h&link_type=abstract
Nature, vol. 287, Oct. 2, 1980, p. 417-420.
Physics
7
Bow Waves, Interplanetary Medium, Shock Wave Propagation, Whistlers, Earth Surface, Polarized Electromagnetic Radiation, Propagation Modes, Satellite Observation, Velocity Measurement
Scientific paper
Measurements of the velocity of discrete whistler-mode wave packets in the region upstream of the earth's bow shock are presented. Data from the dual magnetometers aboard the ISEE 1 and 2 spacecraft was used to determine the time delay between the appearance of a wavefront at each spacecraft in order to obtain the wave velocity in the spacecraft frame, and from it the intrinsic wave phase velocity. Results from the 11 events characterized by sufficiently large velocities reveal the wave packets to exhibit a nearly perfectly circular polarization with the packet field rotating in the left-hand sense about the ambient field direction in the spacecraft frame. In the plasma rest frame, these waves are found to be right-handed polarized waves with frequencies several times the proton gyrofrequency which are attempting to propagate upstream against the solar wind but are in fact being carried towards the earth by the solar wind flow.
Hoppe Michael
Russell Christopher T.
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