dc.contributor.author Munini, Riccardo dc.contributor.author Potgieter, M.S. dc.contributor.author Di Felice, Valeria dc.contributor.author Boezio, M. dc.contributor.author Adriani, O. dc.date.accessioned 2018-05-29T08:13:37Z dc.date.available 2018-05-29T08:13:37Z dc.date.issued 2017 dc.identifier.citation Munini, R. et al. 2017. Short-term variation in the galactic cosmic ray intensity measured with the PAMELA experiment. 35th International Cosmic Ray Conference - ICRC2017 -10-20 July, 2017 Bexco, Busan, Korea. Proceedings of science, 301: Articla no 091. [https://pos.sissa.it/301/091/pdf] en_US dc.identifier.issn 1824-8039 (Online) dc.identifier.uri http://hdl.handle.net/10394/26933 dc.identifier.uri https://pos.sissa.it/301/091/pdf dc.identifier.uri https://pos.sissa.it/301/ dc.description.abstract New results on the galactic cosmic ray (GCR) short-term intensity variation associated with Forbush en_US decrease and co-rotating interaction regions (CIRs) measured by the PAMELA instrument between November 2006 and March 2007 are presented. Most of the past measurements on Forbush decrease events were carried out with neutron monitor detector. This tecnique allows only indirect detection of the overall GCR intensity over an integrated energy range. For the first time, thanks to the unique features of the PAMELA magnetic spectrometer, the Forbush decrease associated with the December 13th coronal mass ejection (CME) was studied in a wide rigidity range (0:4-20 GV) and for different species of GCRs detected directly in space. Using GCR protons, the amplitude and the recovery time of the Forbush decrease were studied for ten rigidity interval with a temporal resolution of one day. For comparison the helium and the electron intensity over time were also studied. The temporal evolution of the helium and proton intensity was found in good agreement while the electrons show, on average, a faster recovery time. This was interpreted as a charge-sign dependence introduced by drift motion experienced by the low rigidity (< 5 GV) GCRs during their propagation through the heliosphere. Moreover a clear 13:5 days cyclical variation was observed in the GCR proton intensity after the Forbush decrease. This phenomena could be interpreted as an effect of prominent structures of compressed plasma in the solar wind, i.e. CIRs, or to the latitudinal gradient due to the crossing of the heliospheric current sheet (HCS) dc.language.iso en en_US dc.publisher PoS en_US dc.title Short-term variation in the galactic cosmic ray intensity measured with the PAMELA experiment en_US dc.type Presentation en_US dc.contributor.researchID 10060014 - Potgieter, Marthinus Steenkamp
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