Cosmic Ray Modulation with the Maximum CME Speed Index During Solar Cycles 23 and 24

Volkan Sarp; Ali Kilcik; Vasyl Yurchyshyn; Atila Ozguc; Jean Pierre Rozelot

doi:10.1007/s11207-019-1481-z

Cosmic Ray Modulation with the Maximum CME Speed Index During Solar Cycles 23 and 24

Volkan Sarp, Ali Kilcik, Vasyl Yurchyshyn, Atila Ozguc, Jean Pierre Rozelot

Center For Solar Terrestrial Research - Big Bear Solar Observatory

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

We analyzed modulation of cosmic-ray intensities (CRIs) during Solar Cycles 23 and 24 by using the international sunspot numbers (ISSN) and the maximum CME speed index (MCMESI) as proxies for solar activity. Temporal variations, cross-correlations, and hysteresis patterns of CRI, MCMESI, and ISSN data were investigated. As a result, we concluded that the MCMESI better describes solar modulation of the CRI as compared to the ISSN. This is mainly because the correlation between CRI and ISSN is caused by the general cyclic trend of solar activity, while the correlation between the CRI and the MCMESI is mainly due to short-term fluctuations related to Forbush decreases. In contrast to the ISSN, there is no time lag between the CRI and the MCMESI variations.

Original language	English (US)
Article number	86
Journal	Solar Physics
Volume	294
Issue number	7
DOIs	https://doi.org/10.1007/s11207-019-1481-z
State	Published - Jul 1 2019

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Coronal mass ejections
Cosmic rays
Solar cycle

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10.1007/s11207-019-1481-z

Cite this

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title = "Cosmic Ray Modulation with the Maximum CME Speed Index During Solar Cycles 23 and 24",

abstract = "We analyzed modulation of cosmic-ray intensities (CRIs) during Solar Cycles 23 and 24 by using the international sunspot numbers (ISSN) and the maximum CME speed index (MCMESI) as proxies for solar activity. Temporal variations, cross-correlations, and hysteresis patterns of CRI, MCMESI, and ISSN data were investigated. As a result, we concluded that the MCMESI better describes solar modulation of the CRI as compared to the ISSN. This is mainly because the correlation between CRI and ISSN is caused by the general cyclic trend of solar activity, while the correlation between the CRI and the MCMESI is mainly due to short-term fluctuations related to Forbush decreases. In contrast to the ISSN, there is no time lag between the CRI and the MCMESI variations.",

keywords = "Coronal mass ejections, Cosmic rays, Solar cycle",

author = "Volkan Sarp and Ali Kilcik and Vasyl Yurchyshyn and Atila Ozguc and Rozelot, {Jean Pierre}",

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doi = "10.1007/s11207-019-1481-z",

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T1 - Cosmic Ray Modulation with the Maximum CME Speed Index During Solar Cycles 23 and 24

AU - Sarp, Volkan

AU - Kilcik, Ali

AU - Yurchyshyn, Vasyl

AU - Ozguc, Atila

AU - Rozelot, Jean Pierre

PY - 2019/7/1

Y1 - 2019/7/1

N2 - We analyzed modulation of cosmic-ray intensities (CRIs) during Solar Cycles 23 and 24 by using the international sunspot numbers (ISSN) and the maximum CME speed index (MCMESI) as proxies for solar activity. Temporal variations, cross-correlations, and hysteresis patterns of CRI, MCMESI, and ISSN data were investigated. As a result, we concluded that the MCMESI better describes solar modulation of the CRI as compared to the ISSN. This is mainly because the correlation between CRI and ISSN is caused by the general cyclic trend of solar activity, while the correlation between the CRI and the MCMESI is mainly due to short-term fluctuations related to Forbush decreases. In contrast to the ISSN, there is no time lag between the CRI and the MCMESI variations.

AB - We analyzed modulation of cosmic-ray intensities (CRIs) during Solar Cycles 23 and 24 by using the international sunspot numbers (ISSN) and the maximum CME speed index (MCMESI) as proxies for solar activity. Temporal variations, cross-correlations, and hysteresis patterns of CRI, MCMESI, and ISSN data were investigated. As a result, we concluded that the MCMESI better describes solar modulation of the CRI as compared to the ISSN. This is mainly because the correlation between CRI and ISSN is caused by the general cyclic trend of solar activity, while the correlation between the CRI and the MCMESI is mainly due to short-term fluctuations related to Forbush decreases. In contrast to the ISSN, there is no time lag between the CRI and the MCMESI variations.

KW - Coronal mass ejections

KW - Cosmic rays

KW - Solar cycle

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Cosmic Ray Modulation with the Maximum CME Speed Index During Solar Cycles 23 and 24

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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