Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p13b1305d&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P13B-1305
Physics
2756 Planetary Magnetospheres (5443, 5737, 6033), 2772 Plasma Waves And Instabilities (2471), 2780 Solar Wind Interactions With Unmagnetized Bodies, 5421 Interactions With Particles And Fields
Scientific paper
Magnetometer data from two Venus-years of the Venus Express mission are investigated for the occurrence of proton cyclotron waves. Recently, proton cyclotron waves (PCW) were detected in the upstream region, in and upstream of the foreshock region and over a large volume of space; they are a direct indication of pick up of planetary protons from the exosphere of Venus and loss of hydrogen to interplanetary space. A statistical survey from long term observations from start of the nominal orbit (May 2006) over two Venus- years gives insight into the waves' spatial occurrence and specific properties. The waves are found up to large distances from the planet (~ 9 Rv); the positions of observation in Solar Wind Magnetic coordinates (with Z along the convective electric field) show no clear organization with the electric field direction. No known mechanisms exist to propagate PCWs across the magnetic fieldlines nor ions into directions of negative electric field. Furthermore, generation of the waves closer to the planet and subsequent propagation in the solar wind outward to the observed position can be excluded for several reasons. Therefore, the PCWs have to be generated locally from available neutral hydrogen, even at large distances. Pick-up from different sources of neutral hydrogen is discussed, leading to a non-satisfying result for non- planetary particles. The PCW observations from VEXMAG are interpreted as indication for the existence of an extended neutral hydrogen exosphere at Venus. The nature of this extended exosphere is still an open issue and under investigation.
Bertucci Cesar
Delva Magda
Mazelle Christian
Voeroes Z.
Volwerk Martin
No associations
LandOfFree
Upstream Proton Cyclotron Waves at Venus and Consequences for the Venus Exosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Upstream Proton Cyclotron Waves at Venus and Consequences for the Venus Exosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Upstream Proton Cyclotron Waves at Venus and Consequences for the Venus Exosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1235120