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dc.contributor.authorMunini, Riccardo
dc.contributor.authorPotgieter, M.S.
dc.contributor.authorDi Felice, Valeria
dc.contributor.authorBoezio, M.
dc.contributor.authorAdriani, O.
dc.date.accessioned2018-05-29T08:13:37Z
dc.date.available2018-05-29T08:13:37Z
dc.date.issued2017
dc.identifier.citationMunini, 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.issn1824-8039 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/26933
dc.identifier.urihttps://pos.sissa.it/301/091/pdf
dc.identifier.urihttps://pos.sissa.it/301/
dc.description.abstractNew results on the galactic cosmic ray (GCR) short-term intensity variation associated with Forbush 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)en_US
dc.language.isoenen_US
dc.publisherPoSen_US
dc.titleShort-term variation in the galactic cosmic ray intensity measured with the PAMELA experimenten_US
dc.typePresentationen_US
dc.contributor.researchID10060014 - Potgieter, Marthinus Steenkamp


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