GEOMAGNETIC MICROPULSATION RESULTS FROM BYRD STATION AND GREAT WHALE RIVER
Early reports from the near-conjugate stations at Great Whale River and Byrd Station were based on the scanty data available in early 1961 (Lokken et al., Martin et al. 1961). The increased volume of data seems now to justify another preliminary report, in which the chief emphasis is on the time-agr...
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Canadian Science Publishing
1965
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crcansciencepubl:10.1139/p65-205 2023-12-17T10:30:39+01:00 GEOMAGNETIC MICROPULSATION RESULTS FROM BYRD STATION AND GREAT WHALE RIVER Jacobs, J. A. Wright, C. S. 1965 http://dx.doi.org/10.1139/p65-205 http://www.nrcresearchpress.com/doi/pdf/10.1139/p65-205 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Physics volume 43, issue 12, page 2099-2122 ISSN 0008-4204 1208-6045 General Physics and Astronomy journal-article 1965 crcansciencepubl https://doi.org/10.1139/p65-205 2023-11-19T13:39:28Z Early reports from the near-conjugate stations at Great Whale River and Byrd Station were based on the scanty data available in early 1961 (Lokken et al., Martin et al. 1961). The increased volume of data seems now to justify another preliminary report, in which the chief emphasis is on the time-agreement of the abrupt commencements of the numerous examples of Birkeland's "Polar Elementary Storms". Passing reference only is made to the associations at Byrd between VLF hiss and other ionospheric phenomena that are being reported by Stanford University. In the auroral zones, the magnetic activity is usually so great, even during the IQSY, that magnetograms can be employed usefully to supplement the micropulsation records. Using selected nighttime occasions, when the change in H is so sudden that a reasonable accuracy in the timing of the micropulsations can be achieved, it is found that the time differences between the two conjugate stations average ± 1 minute, although there is clear evidence that the two stations are not conjugate at all times, as evidenced by the lack of similarity of records. It is confirmed that the more abrupt changes in the magnetic field are associated with high-frequency "riders" of the order of 1 c.p.s., and that these events are often seen with the same riders at the same time at our mid-latitude stations. The return currents that show up in these lower latitudes must be taken into consideration when the areas of conjugate station agreement are considered. The daytime regime of regular (Pc) variations did not lend itself to accurate time comparison, except for very long-period oscillations at the two stations, when the maximum excursions were so far apart in time that one could reasonably assume that the indicated phase differences on the records at the two stations were correct. On this assumption, the long-period oscillations are nearly coincident at the two stations. This may usually be true for the shorter-period oscillations also, but, in many cases, considerable phase differences ... Article in Journal/Newspaper Great Whale River Canadian Science Publishing (via Crossref) Byrd Byrd Station ENVELOPE(-119.533,-119.533,-80.017,-80.017) Canadian Journal of Physics 43 12 2099 2122 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Physics and Astronomy |
spellingShingle |
General Physics and Astronomy Jacobs, J. A. Wright, C. S. GEOMAGNETIC MICROPULSATION RESULTS FROM BYRD STATION AND GREAT WHALE RIVER |
topic_facet |
General Physics and Astronomy |
description |
Early reports from the near-conjugate stations at Great Whale River and Byrd Station were based on the scanty data available in early 1961 (Lokken et al., Martin et al. 1961). The increased volume of data seems now to justify another preliminary report, in which the chief emphasis is on the time-agreement of the abrupt commencements of the numerous examples of Birkeland's "Polar Elementary Storms". Passing reference only is made to the associations at Byrd between VLF hiss and other ionospheric phenomena that are being reported by Stanford University. In the auroral zones, the magnetic activity is usually so great, even during the IQSY, that magnetograms can be employed usefully to supplement the micropulsation records. Using selected nighttime occasions, when the change in H is so sudden that a reasonable accuracy in the timing of the micropulsations can be achieved, it is found that the time differences between the two conjugate stations average ± 1 minute, although there is clear evidence that the two stations are not conjugate at all times, as evidenced by the lack of similarity of records. It is confirmed that the more abrupt changes in the magnetic field are associated with high-frequency "riders" of the order of 1 c.p.s., and that these events are often seen with the same riders at the same time at our mid-latitude stations. The return currents that show up in these lower latitudes must be taken into consideration when the areas of conjugate station agreement are considered. The daytime regime of regular (Pc) variations did not lend itself to accurate time comparison, except for very long-period oscillations at the two stations, when the maximum excursions were so far apart in time that one could reasonably assume that the indicated phase differences on the records at the two stations were correct. On this assumption, the long-period oscillations are nearly coincident at the two stations. This may usually be true for the shorter-period oscillations also, but, in many cases, considerable phase differences ... |
format |
Article in Journal/Newspaper |
author |
Jacobs, J. A. Wright, C. S. |
author_facet |
Jacobs, J. A. Wright, C. S. |
author_sort |
Jacobs, J. A. |
title |
GEOMAGNETIC MICROPULSATION RESULTS FROM BYRD STATION AND GREAT WHALE RIVER |
title_short |
GEOMAGNETIC MICROPULSATION RESULTS FROM BYRD STATION AND GREAT WHALE RIVER |
title_full |
GEOMAGNETIC MICROPULSATION RESULTS FROM BYRD STATION AND GREAT WHALE RIVER |
title_fullStr |
GEOMAGNETIC MICROPULSATION RESULTS FROM BYRD STATION AND GREAT WHALE RIVER |
title_full_unstemmed |
GEOMAGNETIC MICROPULSATION RESULTS FROM BYRD STATION AND GREAT WHALE RIVER |
title_sort |
geomagnetic micropulsation results from byrd station and great whale river |
publisher |
Canadian Science Publishing |
publishDate |
1965 |
url |
http://dx.doi.org/10.1139/p65-205 http://www.nrcresearchpress.com/doi/pdf/10.1139/p65-205 |
long_lat |
ENVELOPE(-119.533,-119.533,-80.017,-80.017) |
geographic |
Byrd Byrd Station |
geographic_facet |
Byrd Byrd Station |
genre |
Great Whale River |
genre_facet |
Great Whale River |
op_source |
Canadian Journal of Physics volume 43, issue 12, page 2099-2122 ISSN 0008-4204 1208-6045 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/p65-205 |
container_title |
Canadian Journal of Physics |
container_volume |
43 |
container_issue |
12 |
container_start_page |
2099 |
op_container_end_page |
2122 |
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1785583640610078720 |