Hale-cycle effects in cosmic-ray intensity during the last four cycles
Monthly cosmic-ray data from Inuvik (0.16 GV) and Climax (2.96 GV) Neutron Monitor stations has been studied with the aid of solar activity parameters for the time period 1947-1995. Systematic differences in the overall shape of successive 11-year modulation cycles and similarities in the alternate...
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1996
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ftnkunivathens:oai:lib.uoa.gr:uoadl:3018745 2024-02-11T10:05:20+01:00 Hale-cycle effects in cosmic-ray intensity during the last four cycles Mavromichalaki, H. Belehaki, A. Rafios, X. Tsagouri, I. 1996-01-01 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3018745 Αγγλικά English eng uoadl:3018745 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3018745 scientific_publication_article Επιστημονική δημοσίευση - Άρθρο Περιοδικού Scientific publication - Journal Article 1996 ftnkunivathens 2024-01-18T18:38:37Z Monthly cosmic-ray data from Inuvik (0.16 GV) and Climax (2.96 GV) Neutron Monitor stations has been studied with the aid of solar activity parameters for the time period 1947-1995. Systematic differences in the overall shape of successive 11-year modulation cycles and similarities in the alternate 11-year cycles seem to be related to the polarity reversals of the polar magnetic field of the Sun. This suggests a possible effectiveness of the Hale cycle during even and odd solar activity cycles. Our results can be understood in terms of open and closed models of the heliosphere. Positive north pole of the Sun leads to open heliosphere where particles reach the Earth more easily when their access route is by the heliospheric polar regions (even cycles) than when they gain access along the current sheet (odd cycles). In this case as the route of access becomes longer due to the waviness of the neutral sheet, the hysteresis effect of cosmic-rays is also longer. This interpretation is explained in terms of different contributions of convection, diffusion and drift mechanisms to the whole modulation process influencing cosmic-ray transport in the heliosphere. Article in Journal/Newspaper Inuvik North Pole Pergamos - Library and Information Center of National and Kapodistrian University of Athens North Pole Inuvik ENVELOPE(-133.610,-133.610,68.341,68.341) Hale ENVELOPE(-86.317,-86.317,-78.067,-78.067) |
institution |
Open Polar |
collection |
Pergamos - Library and Information Center of National and Kapodistrian University of Athens |
op_collection_id |
ftnkunivathens |
language |
English |
description |
Monthly cosmic-ray data from Inuvik (0.16 GV) and Climax (2.96 GV) Neutron Monitor stations has been studied with the aid of solar activity parameters for the time period 1947-1995. Systematic differences in the overall shape of successive 11-year modulation cycles and similarities in the alternate 11-year cycles seem to be related to the polarity reversals of the polar magnetic field of the Sun. This suggests a possible effectiveness of the Hale cycle during even and odd solar activity cycles. Our results can be understood in terms of open and closed models of the heliosphere. Positive north pole of the Sun leads to open heliosphere where particles reach the Earth more easily when their access route is by the heliospheric polar regions (even cycles) than when they gain access along the current sheet (odd cycles). In this case as the route of access becomes longer due to the waviness of the neutral sheet, the hysteresis effect of cosmic-rays is also longer. This interpretation is explained in terms of different contributions of convection, diffusion and drift mechanisms to the whole modulation process influencing cosmic-ray transport in the heliosphere. |
format |
Article in Journal/Newspaper |
author |
Mavromichalaki, H. Belehaki, A. Rafios, X. Tsagouri, I. |
spellingShingle |
Mavromichalaki, H. Belehaki, A. Rafios, X. Tsagouri, I. Hale-cycle effects in cosmic-ray intensity during the last four cycles |
author_facet |
Mavromichalaki, H. Belehaki, A. Rafios, X. Tsagouri, I. |
author_sort |
Mavromichalaki, H. |
title |
Hale-cycle effects in cosmic-ray intensity during the last four cycles |
title_short |
Hale-cycle effects in cosmic-ray intensity during the last four cycles |
title_full |
Hale-cycle effects in cosmic-ray intensity during the last four cycles |
title_fullStr |
Hale-cycle effects in cosmic-ray intensity during the last four cycles |
title_full_unstemmed |
Hale-cycle effects in cosmic-ray intensity during the last four cycles |
title_sort |
hale-cycle effects in cosmic-ray intensity during the last four cycles |
publishDate |
1996 |
url |
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3018745 |
long_lat |
ENVELOPE(-133.610,-133.610,68.341,68.341) ENVELOPE(-86.317,-86.317,-78.067,-78.067) |
geographic |
North Pole Inuvik Hale |
geographic_facet |
North Pole Inuvik Hale |
genre |
Inuvik North Pole |
genre_facet |
Inuvik North Pole |
op_relation |
uoadl:3018745 https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3018745 |
_version_ |
1790602307685056512 |