Abstract
Abstract. The NINA detector on board the Resurs-01 No. 4 satellite (835 km, 98° inclination) is equipped with particle trackers based on silicon strip detectors. From the energy deposited in each of its silicon layers the mass, the momentum direction and energy of incident particles have been determined. The resolutions in mass and energy allow identification of H and He isotopes over the 10-50 MeV/n energy range. The angular resolution is about 2.5°. We present the direct measurements of proton and helium isotopes pitch angle distributions derived from Resurs-01 No.4/NINA observations and their variations as functions of (B, L) coordinates and energy. The measurements of trapped helium isotopes spectrum are also presented.
Highlights
Besides the energy spectra, angular distributions of protons at low altitudes are needed to accurately evaluate their effects on space crew and equipments
We present the direct measurements of proton and helium isotopes pitch angle distributions derived from Resurs-01 No.4/New Instrument for Nuclear Analysis (NINA) observations and their variations as functions of (B, L) coordinates and energy
We present the angular distribution of protons and helium isotope nuclei measured by NINA, along with its variation as functions of (B, L) coordinates and energy
Summary
Angular distributions of protons at low altitudes are needed to accurately evaluate their effects on space crew and equipments. Detectors for direct angular and energy distribution measurements may be of a complexity level and a mass budget that are scarcely allowed on small satellite missions. The New Instrument for Nuclear Analysis (NINA) instrument, accommodated on the Resurs-01 No. satellite, is that type of complex and heavy telescope. Data acquired using such a detector usually serve. The description of the NINA instrument, orbit operations and detector performance in orbit may be found in Bidoli et al (2001). The recommendations for the design of directional particle telescopes to study angle distributions of trapped particles are presented
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