Gyroradius effects on the energetic ions in the tail lobes of Comet P/Giacobini-Zinner

Details Gyroradius effects on the energetic ions in the tail lobes of Comet P/Giacobini-Zinner Gyroradius effects on the energetic ions in the tail lobes of Comet P/Giacobini-Zinner

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..419d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, April 1986, p. 419-422.

Other

11

Comet Tails, Energetic Particles, Giacobini-Zinner Comet, Ion Distribution, Current Sheets, Flyby Missions, Pitch (Inclination), Radii, Comets, Giacobini-Zinner, Ions, Comet Tails, Shape, Ice Missions, Depletion, Intensity, Distribution, Analysis, Motion, Gradients, Current Sheets, Magnetic Fields, Density, Spacecraft Observations, Energetic Particle Anisotropy Spectrometer, Epas, Flux

Scientific paper

It is reported that during the ICE fly-by of comet P/Giacobini-Zinner, a depletion was seen in the energetic ion intensities (E greater than 65 keV for 'water group' ions) extending to about 40 min on either side of the time of closest approach (1102 UT on September 11, 1985). It is demonstrated that the physical size of this hole is a few ion gyroradii (about 1.5 x 10 to the 4 km). Angular analysis of the ion distributions in the 'gyroradius region' can distinguish those ions whose gyromotion is entirely in one comet lobe from those that cross the current sheet into the other lobe. In the central tail within a few minutes of closest approach, the single-lobe ions exhibit high intensities and little pitch angle dependence, whereas the ions crossing the current sheet have lower intensities and are streaming along the magnetic field away from the comet. The derived density gradients are used to determine the orientation of the current sheet at closest approach, as 44 degrees east of north.

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