Charged Particle Measurements in NLC and/or PMSE Regions During the DROPPS Sounding Rocket Campaign

Details Charged Particle Measurements in NLC and/or PMSE Regions During the DROPPS Sounding Rocket Campaign Charged Particle Measurements in NLC and/or PMSE Regions During the DROPPS Sounding Rocket Campaign

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31b08c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA31B-08

Computer Science

Sound

0305 Aerosols And Particles (0345, 4801), 0340 Middle Atmosphere--Composition And Chemistry, 2407 Auroral Ionosphere (2704), 2419 Ion Chemistry And Composition (0335), 2427 Ionosphere/Atmosphere Interactions (0335)

Scientific paper

Two NASA-sponsored sounding rocket payloads were launched as part of the DROPPS (Distribution and Role of Particles in the Polar Summer Mesosphere) Program, conducted in coordination with the MIDAS Campaign at the Andoya Rocket Range, Norway, during the summer of 1999. The first DROPPS payload (NASA flight 21.123), launched at 2336:30 UT on July 5, 1999, was flown during strong PMSE and weak NLC conditions. The second DROPPS flight (21.124) was launched at 0328:45 UT on July 14, 1999, during strong overhead NLC conditions and no evidence of PMSEs. Local magnetometers indicated weakly disturbed conditions for the first launch, while the second one occurred during a quiet geomagnetic period. The DROPPS payloads included a full set of complementary instruments designed to observe the charged particle (electrons, positive ions, and aerosols) and electric field environment in the NLC and PMSE regions. We continue to study this data set, and we report here our most recent conclusions. Strong "biteouts" in the electron density concentrations were observed in the PMSE/NLC regions. Also, the positive ion data show the presence of two distinct mobility groups, with the concentration of the lowest mobility group becoming similar to the concentration of the higher mobility group at the PMSE/NLC altitudes. Aerodynamic modeling of the flow of particles around the payload has been done to study the influence of the particle environment on the observed electric fields. Two fixed bias blunt probes that were electrically screened to provide a local-collection electric field observed the heaviest aerosol particles. The separate (+2.5 V and -2.5 V) bias values permitted identification of impact ionization effects. Evidence for the presence of both negative and neutral charged layers will be shown.

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