A New Perspective on Inner Zone Proton Data from 1971

Details A New Perspective on Inner Zone Proton Data from 1971 A New Perspective on Inner Zone Proton Data from 1971

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm31a0241m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM31A-0241

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2774 Radiation Belts

Scientific paper

The NASA Geospace Radiation Belt Storm Probes Mission will provide a new look at the inner magnetosphere, including the inner zone protons that originate from the decay of neutrons in interactions from galactic cosmic rays with the upper atmosphere. The G-RBSP mission is scheduled for launch in 2012. About forty years prior to the launch of G-RBSP, the US Air Force Orbiting Vehicle 20 (OV1-20) included instrumentation designed to capture a glimpse of the inner zone proton environment up to ~500 MeV. The Aerospace Corporation flew a Cherenkov counter on the OV1-20 propulsion module in a polar orbit of 130 km by ~1950 km; apogee was near the equator, and on-board hardware triggered the transmitter when the count rates were high. The data included singles rates, coincidence rates, and on-board magnetometer measurements. The Cherenkov counter used a fast coincidence between pairs of scintillator disk detectors to define the geometry, thus providing clean measurements in the penetrating, high-rate inner zone environment. The propulsion module re-entered about 10 days after launch in 1971. While the OV1-20 mission life was short, the data could offer an interesting look into the environment near the G-RBSP perigee. We will revisit the OV1-20 proton measurements with the perspective of the science and engineering requirements of G-RBSP as well as results from later missions that also sampled the inner zone protons from different orbits (CRRES; TSX-5; SAMPEX). This work was supported under The Aerospace Corporation's Independent Research and Development Program.

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