Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p41b..08k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P41B-08
Other
2152 Pickup Ions, 2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma, 6295 Venus
Scientific paper
The MESSENGER gravity assist maneuver at Venus on 5 June 2007 provided an opportunity to observe the interaction of Venus with the solar wind along a unique trajectory through the Venus environment. Closest approach (CA) occurred near 23:08 UTC on 5 June, and the Magnetometer experiment identified the inbound shock crossing at 22:57:55 UTC on 5 June and the outbound crossing at 00:43:47 UTC on 6 June. The Magnetometer experiment operated at its maximum sampling rate for a 12-hour span centered on CA, providing continuous coverage of magnetic signatures of electromagnetic waves up to 10 Hz. Prior to the inbound shock crossing, three intense foreshock magnetic field intensifications, analogous to hot flow anomalies documented at Earth's bow shock, were observed from 22:56:40 to 22:57:35 UTC on 5 June. The first upstream waves were observed as early as 22:25 UTC, more than 30 minutes upstream of the shock crossing at distance of 3 Venus radii upstream of the shock. These waves occurred in two narrow frequency bands, one near 0.05 Hz corresponding to a gyrofrequency of ions with M/Q in the range 10 to 20, and another near 1 Hz corresponding to a gyrofrequency of ions with M/Q near 1. Both waves increased in intensity with decreasing distance from the shock, but the lower-frequency waves ceased around 22:47 UTC whereas the higher-frequency waves persisted up to the inbound shock crossing. The higher-frequency waves were observed again following the outbound shock crossing. We attribute the 1-Hz waves to an ion cyclotron instability excited by solar wind ions reflected upstream by the shock. The lower-frequency waves are consistent with heavy ions originating from the Venus ionosphere and accelerated upstream by the shock.
Acuña Mario Humberto
Anderson Benjamin J.
Boardsen Scott A.
Korth Haje
Slavin James Arthur
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