The behaviour of galactic cosmic ray intensity during solar activity cycle 24

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The behaviour of galactic cosmic ray intensity during solar activity cycle 24. / Ross, Eddie; Chaplin, William J.

In: Solar Physics, Vol. 294, No. 1, 8, 01.2019, p. 8.

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@article{5c15c951f20b414abc4d618152801e99,
title = "The behaviour of galactic cosmic ray intensity during solar activity cycle 24",
abstract = "We have studied long-term variations of galactic cosmic-ray (GCR) intensity in relation to the sunspot number (SSN) during the most recent solar cycles. This study analyses the time lag between the GCR intensity and SSN, and hysteresis plots of the GCR count rate against SSN for Solar Cycles 20 – 23, to validate a methodology against previous results in the literature, before applying the method to provide a timely update on the behaviour of Cycle 24. Plots of SSN versus GCR show a clear difference between the odd- and even-numbered cycles. Linear and elliptical models have been fit to the data, with the linear fit and elliptical model proving the more suitable model for even- and odd-numbered solar-activity cycles, respectively, in agreement with previous literature. Through the application of these methods for Solar Cycle 24, it has been shown that Cycle 24 experienced a lag of two to four months between the GCR intensity and SSN, and this follows the trend of the preceding activity cycles, albeit with a slightly longer lag than previous even-numbered cycles. It has been shown through the hysteresis analysis that the linear fit is a better representative model for Cycle 24, as the ellipse model does not show a significant improvement, which is also in agreement with previous even-numbered cycles.",
keywords = "Cosmic rays, galactic, Solar cycle, observations, Sunspots, statistics",
author = "Eddie Ross and Chaplin, {William J.}",
note = "19 pages, 10 figures, 6 tables; accepted for publication in Solar Physics",
year = "2019",
month = jan
doi = "10.1007/s11207-019-1397-7",
language = "English",
volume = "294",
pages = "8",
journal = "Solar Physics",
issn = "0038-0938",
publisher = "Springer",
number = "1",

}

RIS

TY - JOUR

T1 - The behaviour of galactic cosmic ray intensity during solar activity cycle 24

AU - Ross, Eddie

AU - Chaplin, William J.

N1 - 19 pages, 10 figures, 6 tables; accepted for publication in Solar Physics

PY - 2019/1

Y1 - 2019/1

N2 - We have studied long-term variations of galactic cosmic-ray (GCR) intensity in relation to the sunspot number (SSN) during the most recent solar cycles. This study analyses the time lag between the GCR intensity and SSN, and hysteresis plots of the GCR count rate against SSN for Solar Cycles 20 – 23, to validate a methodology against previous results in the literature, before applying the method to provide a timely update on the behaviour of Cycle 24. Plots of SSN versus GCR show a clear difference between the odd- and even-numbered cycles. Linear and elliptical models have been fit to the data, with the linear fit and elliptical model proving the more suitable model for even- and odd-numbered solar-activity cycles, respectively, in agreement with previous literature. Through the application of these methods for Solar Cycle 24, it has been shown that Cycle 24 experienced a lag of two to four months between the GCR intensity and SSN, and this follows the trend of the preceding activity cycles, albeit with a slightly longer lag than previous even-numbered cycles. It has been shown through the hysteresis analysis that the linear fit is a better representative model for Cycle 24, as the ellipse model does not show a significant improvement, which is also in agreement with previous even-numbered cycles.

AB - We have studied long-term variations of galactic cosmic-ray (GCR) intensity in relation to the sunspot number (SSN) during the most recent solar cycles. This study analyses the time lag between the GCR intensity and SSN, and hysteresis plots of the GCR count rate against SSN for Solar Cycles 20 – 23, to validate a methodology against previous results in the literature, before applying the method to provide a timely update on the behaviour of Cycle 24. Plots of SSN versus GCR show a clear difference between the odd- and even-numbered cycles. Linear and elliptical models have been fit to the data, with the linear fit and elliptical model proving the more suitable model for even- and odd-numbered solar-activity cycles, respectively, in agreement with previous literature. Through the application of these methods for Solar Cycle 24, it has been shown that Cycle 24 experienced a lag of two to four months between the GCR intensity and SSN, and this follows the trend of the preceding activity cycles, albeit with a slightly longer lag than previous even-numbered cycles. It has been shown through the hysteresis analysis that the linear fit is a better representative model for Cycle 24, as the ellipse model does not show a significant improvement, which is also in agreement with previous even-numbered cycles.

KW - Cosmic rays, galactic

KW - Solar cycle, observations

KW - Sunspots, statistics

UR - http://www.scopus.com/inward/record.url?scp=85060435848&partnerID=8YFLogxK

U2 - 10.1007/s11207-019-1397-7

DO - 10.1007/s11207-019-1397-7

M3 - Article

C2 - 30872867

VL - 294

SP - 8

JO - Solar Physics

JF - Solar Physics

SN - 0038-0938

IS - 1

M1 - 8

ER -