SM53A-05
Inner magnetosphere plasma, statistics from the Van Allen Probes HOPE instrument and data release 3.
Friday, 18 December 2015: 14:31
2018 (Moscone West)
Brian Larsen1, Ruth M Skoug2, David K Olson3, Geoff Reeves4, Reiner H Friedel3, Herbert O Funsten5 and Van Allen Probes - ECT HOPE Instrument Team, (1)The New Mexico Consortium, Los Alamos, NM, United States, (2)Los Alamos Natl Lab, Los Alamos, NM, United States, (3)Los Alamos National Laboratory, Los Alamos, NM, United States, (4)University of Minnesota, School of Physics and Astronomy, Minneapolis, MN, United States, (5)Los Alamos Natl Laboratory, Los Alamos, NM, United States
Abstract:
As the twin Van Allen probes spacecraft complete three years on-orbit more than a complete revolution in local time has occurred. We present the state of the HOPE plasma data and statistics of the plasma distribution inside of geostationary orbit. Over the course of the mission a better understanding of the instrument has been gained and the needed corrections added to the data to enable long-term statistics to be collected and compared with confidence. The major correction to the data is the expected degradation of the channel electron multiplier (CEM) efficiency as a function of time and count rate. HOPE provides background data sufficient to monitor the absolute detection efficiency throughout the mission. We have incorporated a time dependent gain correction factor to the data that normalizes the gain and thus the derived plasma properties. In addition the CEM bias voltage was adjusted bringing the gain back toward launch values. With a standard set of data electron and ion composition statistics are computed and presented. These statistics serve as a L-MLT dependent distribution to begin inner magnetosphere plasma modeling, instrument comparison, and climatology studies. These data are presented as ECT HOPE release 3.
