Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978
The diurnal anisotropy of cosmic ray intensity has been investigated over the interval 1973–1978 by using neutron monitor data from Calgary, Deep River, Goose Bay, and Inuvik. It is observed that in general, the 27-day variation in the diurnal anisotropy is greater for the component perpendicular to...
Published in: | Journal of Geophysical Research |
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Language: | English |
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1981
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Online Access: | https://doi.org/10.1029/JA086iA13p11093 https://nrc-publications.canada.ca/eng/view/object/?id=8a2ab062-6900-43ad-b573-fbaf34ad02cf https://nrc-publications.canada.ca/fra/voir/objet/?id=8a2ab062-6900-43ad-b573-fbaf34ad02cf |
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ftnrccanada:oai:cisti-icist.nrc-cnrc.ca:cistinparc:21274949 2023-05-15T16:55:44+02:00 Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978 Agrawal, S.P. Venkatesan, D. 1981-12-01 text https://doi.org/10.1029/JA086iA13p11093 https://nrc-publications.canada.ca/eng/view/object/?id=8a2ab062-6900-43ad-b573-fbaf34ad02cf https://nrc-publications.canada.ca/fra/voir/objet/?id=8a2ab062-6900-43ad-b573-fbaf34ad02cf eng eng issn:0148-0227 Journal of Geophysical Research: Space Physics, Volume: 86, Issue: A13, Publication date: 1981-12-01, Pages: 11093–11097 doi:10.1029/JA086iA13p11093 article 1981 ftnrccanada https://doi.org/10.1029/JA086iA13p11093 2021-09-01T06:16:41Z The diurnal anisotropy of cosmic ray intensity has been investigated over the interval 1973–1978 by using neutron monitor data from Calgary, Deep River, Goose Bay, and Inuvik. It is observed that in general, the 27-day variation in the diurnal anisotropy is greater for the component perpendicular to the nominal interplanetary magnetic field (IMF) in comparison with the parallel (or field aligned) component, which has very little ‘power’. However, the direction of the average anisotropy vector is aligned almost perpendicular (within the hour) to the IMF. The results are discussed in terms of alternate possibilities: the ‘power’ with 27-day period and its harmonics arise from fluctuations in the amplitude aligned in the direction (a) of the total vector itself (≈ 16 hours) (b) perpendicular to the IMF. Peer reviewed: Yes NRC publication: Yes Article in Journal/Newspaper Inuvik National Research Council Canada: NRC Publications Archive Inuvik ENVELOPE(-133.610,-133.610,68.341,68.341) Journal of Geophysical Research 86 A13 11093 |
institution |
Open Polar |
collection |
National Research Council Canada: NRC Publications Archive |
op_collection_id |
ftnrccanada |
language |
English |
description |
The diurnal anisotropy of cosmic ray intensity has been investigated over the interval 1973–1978 by using neutron monitor data from Calgary, Deep River, Goose Bay, and Inuvik. It is observed that in general, the 27-day variation in the diurnal anisotropy is greater for the component perpendicular to the nominal interplanetary magnetic field (IMF) in comparison with the parallel (or field aligned) component, which has very little ‘power’. However, the direction of the average anisotropy vector is aligned almost perpendicular (within the hour) to the IMF. The results are discussed in terms of alternate possibilities: the ‘power’ with 27-day period and its harmonics arise from fluctuations in the amplitude aligned in the direction (a) of the total vector itself (≈ 16 hours) (b) perpendicular to the IMF. Peer reviewed: Yes NRC publication: Yes |
format |
Article in Journal/Newspaper |
author |
Agrawal, S.P. Venkatesan, D. |
spellingShingle |
Agrawal, S.P. Venkatesan, D. Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978 |
author_facet |
Agrawal, S.P. Venkatesan, D. |
author_sort |
Agrawal, S.P. |
title |
Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978 |
title_short |
Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978 |
title_full |
Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978 |
title_fullStr |
Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978 |
title_full_unstemmed |
Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978 |
title_sort |
variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973–1978 |
publishDate |
1981 |
url |
https://doi.org/10.1029/JA086iA13p11093 https://nrc-publications.canada.ca/eng/view/object/?id=8a2ab062-6900-43ad-b573-fbaf34ad02cf https://nrc-publications.canada.ca/fra/voir/objet/?id=8a2ab062-6900-43ad-b573-fbaf34ad02cf |
long_lat |
ENVELOPE(-133.610,-133.610,68.341,68.341) |
geographic |
Inuvik |
geographic_facet |
Inuvik |
genre |
Inuvik |
genre_facet |
Inuvik |
op_relation |
issn:0148-0227 Journal of Geophysical Research: Space Physics, Volume: 86, Issue: A13, Publication date: 1981-12-01, Pages: 11093–11097 doi:10.1029/JA086iA13p11093 |
op_doi |
https://doi.org/10.1029/JA086iA13p11093 |
container_title |
Journal of Geophysical Research |
container_volume |
86 |
container_issue |
A13 |
container_start_page |
11093 |
_version_ |
1766046789125799936 |