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Rapid recovery of anomalous cosmic ray flux at 1 Au in solar cycle 22
Author(s) -
Hasebe N.,
Mishima Y.,
Fujiki K.,
Fujii M.,
Kobayashi M.,
Doke T.,
Kikuchi J.,
Hayashi T.,
Shino T.,
Ito T.,
Takashima T.,
Yanagimachi T.,
Nakamoto A.,
Murakami H.,
Nagata K.,
Kohno T.,
Munakata K.,
Kato C.,
Yanagita S.,
Kashiwagi T.,
Maezawa K.,
Muraki Y.,
Nishida A.,
Terasawa T.,
Wilken B.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02098
Subject(s) - cosmic ray , physics , satellite , solar cycle , flux (metallurgy) , solar maximum , astrophysics , solar minimum , solar energetic particles , solar physics , cosmic cancer database , solar cycle 22 , astronomy , coronal mass ejection , solar wind , nuclear physics , plasma , materials science , metallurgy
A new observation of low energy cosmic ray particles with the energies from 4 to 120 MeV/n by the HEP instrument onboard the GEOTAIL satellite orbiting at 1 AU shows a remarkable enhancement of anomalous cosmic ray (ACR) N, O and Ne in the period September 1992–December 1993 before approaching to the solar minimum in solar cycle 22. The ACR fluxes obtained by the GEOTAIL observation are in good agreement with the results earlier obtained from the SAMPEX satellite [Mewaldt et al. 1993a,b]. The ACR carbon is also evident though the C enhancement is small compared with those of N, O and Ne. We confirm the new SAMPEX finding that the ACR fluxes have recovered more rapidly in 1992–1993 than in previous solar cycles and find this tendency continues to the end of 1993.