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Plasma and Wave Phenomena Induced by Neutral Gas Releases in the Solar Wind : Volume 20, Issue 1 (30/11/-0001)

By Laakso, H.

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Book Id: WPLBN0004000928
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Plasma and Wave Phenomena Induced by Neutral Gas Releases in the Solar Wind : Volume 20, Issue 1 (30/11/-0001)  
Author: Laakso, H.
Volume: Vol. 20, Issue 1
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Trotignon, J., Janhunen, P., Grard, R., & Laakso, H. (-0001). Plasma and Wave Phenomena Induced by Neutral Gas Releases in the Solar Wind : Volume 20, Issue 1 (30/11/-0001). Retrieved from http://community.worldlibrary.net/


Description
Description: ESA Space Science Department, Noordwijk, The Netherlands. We investigate plasma and wave disturbances generated by nitrogen (N2) gas releases from the cooling system of an IR-camera on board the Vega 1 and Vega 2 spacecraft, during their flybys of comet Halley in March 1986. N2 molecules are ionized by solar UV radiation at a rate of ~ 7 · 10-7 s-1 and give rise to a plasma cloud expanding around the spacecraft. Strong disturbances due to the interaction of the solar wind with the N+2 ion cloud are observed with a plasma and wave experiment (APV-V instrument). Three gas releases are accompanied by increases in cold electron density and simultaneous decreases of the spacecraft potential; this study shows that the spacecraft potential can be monitored with a reference sensor mounted on a short boom. The comparison between the model and observations suggests that the gas expands as an exhaust plume, and approximately only 1% of the ions can escape the beam within the first meters. The releases are also associated with significant increases in wave electric field emission (8 Hz–300 kHz); this phenomenon lasts for more than one hour after the end of the release, which is most likely due to the temporary contamination of the spacecraft surface by nitrogen gas. DC electric fields associated with the events are complex but interesting. No magnetic field perturbations are detected, suggesting that no significant diamagnetic effect (i.e. magnetic cavity) is associated with these events.

Key words. Ionosphere (planetary ionosphere) – Space plasma physics (active perturbation experiments; instruments and techniques)


Summary
Plasma and wave phenomena induced by neutral gas releases in the solar wind

 

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