✦ LIBER ✦

Solar source of the interplanetary sector structure

✍ Scribed by John M. Wilcox; Norman F. Ness

Publisher: Springer
Year: 1967
Tongue: English
Weight: 846 KB
Volume: 1
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00151368

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✦ Synopsis

The interplanetary sector structure observed by the IMP-1 satellite during three solar rotations in 1963-4 is compared with the photospheric magnetic field structure observed with the solar magnetograph at Mt. Wilson Observatory. The interplanetary sector structure was most prominent on the sun in latitudes between 10 ~ and 20 ~ although the average heliographic latitude of the satellite was 3 89176 A superposed-epoch analysis of the calcium plage structure obtained from the Fraunhofer Institute daily maps of the sun is used to discuss the relation between the structure of the plages and the interplanetary sector structure. A possible explanation for the observations is discussed in terms of a North-South asymmetry in the flow of the solar wind. It is suggested that these observations favor the "equinoctial" hypothesis as compared with the "axial" hypothesis for the explanation of the semi-annual maxima in geomagnetic activity.

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