Publication Date:
1991-09-27
Description:
At Venus the Energetic Particles Detector (EPD) on the Galileo spacecraft measured the differential energy spectra and angular distributions of ions 〉22 kiloelectron volts (keV) and electrons 〉 15 keV in energy. The only time particles were observed by EPD was in a series of episodic events [0546 to 0638 universal time (UT)] near closest approach (0559:03 UT). Angular distributions were highly anisotropic, ordered by the magnetic field, and showed ions arriving from the hemisphere containing Venus and its bow shock. The spectra showed a power law form with intensities observed into the 120- to 280-keV range. Comparisons with model bow shock calculations show that these energetic ions are associated with the venusian foreshock-bow shock region. Shock-drift acceleration in the venusian bow shock seems the most likely process responsible for the observed ions.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Williams, D J -- McEntire, R W -- Krimigis, S M -- Roelof, E C -- Jaskulek, S -- Tossman, B -- Wilken, B -- Studemann, W -- Armstrong, T P -- Fritz, T A -- Lanzerotti, L J -- Roederer, J G -- New York, N.Y. -- Science. 1991 Sep 27;253(5027):1525-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17784094" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
