The onset time interval of geomagnetic disturbances in the conjugate areas

Hajkowicz L.A. (1984) The onset time interval of geomagnetic disturbances in the conjugate areas. Planetary and Space Science, 32 7: 819-823. doi:10.1016/0032-0633(84)90004-7

Author Hajkowicz L.A.
Title The onset time interval of geomagnetic disturbances in the conjugate areas
Journal name Planetary and Space Science   Check publisher's open access policy
ISSN 0032-0633
Publication date 1984-01-01
Sub-type Article (original research)
DOI 10.1016/0032-0633(84)90004-7
Volume 32
Issue 7
Start page 819
End page 823
Total pages 5
Language eng
Subject 1908 Geophysics
1912 Space and Planetary Science
3103 Astronomy and Astrophysics
Abstract The onset time interval of geomagnetic disturbances, as deduced from the numerous cases of rapid changes of K-indices over a cycle in solar activity, was studied for two conjugate auroral stations, Macquarie Island and College. There is a distinct peak in the occurrence number of the disturbances for both stations at an interval 09.00-12.00 U.T., which is close to the local midnight at College but is in the pre-midnight sector at Macquarie Island. For comparison, a similar study was applied to the magnetic data obtained at two more auroral stations, Kiruna and Sodankyla. The onset time of the disturbances for these stations was most frequent at 18.00-21.00 U.T., centered at the conjugate midnight of Kiruna and Sodankyla in the Southern Hemisphere but well ahead of the local midnight of the stations themselves. The specific diurnal occurrences of the disturbances at all four auroral stations are consistent with a difference in the geometry between the southern and northern auroral ovals. It appears that the prevailing onset time of geomagnetic disturbances is associated with the time when both conjugate stations (or conjugate locations) are within the auroral oval and thus accessible to a direct particle influx from the Earth's magnetotail.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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