July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

PAMELA'S MEASUREMENT OF GEOMAGNETIC CUTOFF VARIATIONS DURING SOLAR ENERGETIC PARTICLE EVENTS

Jul 30, 2015, 3:30 PM
1h
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 213
Poster contribution CR-EX Poster 1 CR

Speaker

Dr Alessandro Bruno (Department of Physics, University of Bari, I-70126 Bari, Italy)

Description

Data from the PAMELA satellite experiment were used to measure the geomagnetic cutoff for high-energy (above 80 MeV) protons during the solar particle events on 2006 December 13 and 14. The variations of the cutoff latitude as a function of rigidity were studied on relatively short timescales, corresponding to single spacecraft orbits (about 94 minutes). Estimated cutoff values were cross-checked with those obtained by means of a trajectory tracing approach based on dynamical empirical modeling of the Earth's magnetosphere. We find significant variations in the cutoff latitude, with a maximum suppression of about 6 degrees for 80 MeV protons during the main phase of the storm. The observed reduction in the geomagnetic shielding and its temporal evolution were compared with the changes in the magnetosphere configuration, investigating the role of IMF, solar wind and geomagnetic (Kp, Dst and Sym-H indexes) variables and their correlation with PAMELA results.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 469

Primary author

Dr Alessandro Bruno (Department of Physics, University of Bari, I-70126 Bari, Italy)

Presentation materials