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
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.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 | |