Recent sounding rocket flights of a mesospheric charged dust detector

Details Recent sounding rocket flights of a mesospheric charged dust detector Recent sounding rocket flights of a mesospheric charged dust detector

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa41a1548l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA41A-1548

Physics

2442 Meteor-Trail Physics, 2461 Plasma Interactions With Dust And Aerosols (7849), 3332 Mesospheric Dynamics, 7849 Plasma Interactions With Dust And Aerosols (2461)

Scientific paper

Various versions of fairly simple faraday-cup-style mesospheric charged dust detectors have been flown in recent years on mesospheric sounding rockets. The Dartmouth/UNH dust detector, one of the simplest versions, has been flown multiple times as a standalone instrument. This past year we have had the opportunity to fly copies of this instrument on several payloads with more complete instrumentation suites, allowing the comparison of the Dust Detector response both to other particle signatures, and to the response of similar dust sensors. On January 31st 2008, the detector was flown as part of the HotPay2 Campaign fromthe Andøya Rocket Range, Norway. On 30 June 2008 (1322UT) and 12 July 2008 (1046UT), another copy of the detector was flown on the ECOMA-04 and ECOMA-06 flights, also from Andoya. The HotPay2 flight, together with a new and more rigorous model of the detector response, allows a careful comparison of the dust density measurement to the densities of the ambient thermal ion and electron populations. The ECOMA flights allow comparison to both the Univ Tromso (Havnes) dust detector and the IAP (Rapp) dust detector, as all three sensors flew on both ECOMA missions. The data obtained with the Dartmouth/UNH Dust Detector on the HotPay2 flight show a peak charged dust density of approximately 500 particles per cc at 87 km. This interpretation, based on a newer and more rigorous model of the detector response, gives a five-fold increase from the estimated density of previous analyses. The measured HotPay2 ion density and electron density instruments show a net positive plasma charge in the 80-100 km range. By comparing the absolute dust density measurement to the profile of net positive charge, the mesospheric plasma's apparent non- neutrality may be explained by the presence of the observed negative charged dust layer in the 77-97 km altitude range.

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