Bernstein waves in the Io plasma torus: A novel kind of electron temperature sensor

Details Bernstein waves in the Io plasma torus: A novel kind of electron temperature sensor Bernstein waves in the Io plasma torus: A novel kind of electron temperature sensor

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821163m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,163-21,176

Astronomy and Astrophysics

Astronomy

30

Electron Energy, Io, Plasma Waves, Radio Astronomy, Radio Waves, Spaceborne Astronomy, Temperature Sensors, Toroidal Plasmas, Gyrofrequency, Plasma Frequencies, Radio Antennas, Toruses, Ulysses Mission

Scientific paper

During Ulysses passage through the Io plasma torus, along a basically north-to-south trajectory crossing the magnetic equator at R approximately 7.8 RJ from Jupiter, the United Radio and Plasma Wave experiment observed weakly banded emissions with well-defined minima at gyro-harmonics. These noise bands are interpreted as stable electrostatic fluctuations in Bernstein modes. The finite size of the antenna is shown to produce an apparent polarization depending on the wavelength, so that measuring the spin modulation as a function of frequency yields the gyroradius and thus the local cold electron temperature. This determination is not affected by a very small concentration of suprathermal electrons, is independent of any gain calibration, and does not require an independent magnetic field measurement. We find that the temperature increases with latitude, from approximately 1.3 x 105 K near the magnetic (or centrifugal) equator, to approximately twice this value at +/- 10 deg latitude (i.e., a distance of approximately 1.3 RJ from the magnetic equatorial plane). As a by-product, we also deduce the magnetic field strength with a few percent error.

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