Long-Term Cosmic Ray Variability and the CME-Index | Zendy

H. Mavromichalaki | Zendy; Evangelos Paouris | Zendy

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Long-Term Cosmic Ray Variability and the CME-Index

Author(s) -

H. Mavromichalaki,

Evangelos Paouris

Publication year - 2012

Publication title -

advances in astronomy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.364

H-Index - 34

eISSN - 1687-7977

pISSN - 1687-7969

DOI - 10.1155/2012/607172

Subject(s) - physics , cosmic ray , solar cycle 22 , heliosphere , solar minimum , interplanetary magnetic field , heliospheric current sheet , solar cycle , sunspot , interplanetary spaceflight , solar maximum , solar wind , astrophysics , solar cycle 23 , solar cycle 24 , coronal mass ejection , interplanetary medium , astronomy , magnetic field , plasma , nuclear physics , quantum mechanics

The cosmic ray modulation in relation to solar activity indices and heliospheric parameters during the period January 1996–October 2011, covering the solar cycle 23 and the ascending phase of solar cycle 24, is studied. The new perspective of this contribution is that the CME-index, obtained from only the CMEs with angular width greater than 30 degrees, gives much better results than in previous works. The proposed model for the calculation of the modulated cosmic ray intensity obtained from the combination of solar indices and heliospheric parameters gives a very satisfactory value of the standard deviation. The best reproduction of the cosmic ray intensity is obtained by taking into account solar and interplanetary indices such as sunspot number, interplanetary magnetic field, CME-index, and heliospheric current sheet tilt. The standard deviation between the observed and calculated values is about 6.63% for the solar cycle 23 and 4.13% for the ascending part of solar cycle 24

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