PAMELA's measurements of geomagnetically trapped and albedo protons
2015 (English)In: Proceedings of Science, Proceedings of Science (PoS) , 2015Conference paper (Refereed)
Data from the PAMELA satellite experiment were used to perform a detailed measurement of under-cutoff protons at low Earth orbits. On the basis of a trajectory tracing approach using a realistic description of the magnetosphere, protons were classified into geomagnetically trapped and re-entrant albedo. The former include stably-trapped protons in the South Atlantic Anomaly, which were analyzed in the framework of the adiabatic theory, investigating energy spectra, spatial and angular distributions; results were compared with the predictions of the AP8 and the PSB97 empirical trapped models. The albedo protons were classified into quasi-trapped, concentrating in the magnetic equatorial region, and un-trapped, spreading over all latitudes and including both short-lived (precipitating) and long-lived (pseudo-trapped) components. Features of the penumbra region around the geomagnetic cutoff were investigated as well. PAMELA observations significantly improve the characterization of the high energy proton populations in near Earth orbits. The.
Place, publisher, year, edition, pages
Proceedings of Science (PoS) , 2015.
IdentifiersURN: urn:nbn:se:kth:diva-194732ScopusID: 2-s2.0-84988695444OAI: oai:DiVA.org:kth-194732DiVA: diva2:1048456
34th International Cosmic Ray Conference, ICRC 2015, 30 July 2015 through 6 August 2015
QC 201611212016-11-212016-10-312016-11-21Bibliographically approved