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...

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Published in:Journal of Geophysical Research
Main Authors: Agrawal, S.P., Venkatesan, D.
Format: Article in Journal/Newspaper
Language:English
Published: 1981
Subjects:
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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spelling 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
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