Long transequatorial interconnecting loops of the new solar cycle

Details Long transequatorial interconnecting loops of the new solar cycle Long transequatorial interconnecting loops of the new solar cycle

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..187...33f&link_type=abstract

Solar Physics, v. 187, Issue 1, p. 33-44 (1999).

Physics

18

Scientific paper

We study two long transequatorial loops connecting high-latitude regions of the new solar cycle. These loops (with lengths of 47 and 61 heliographic degrees) provide evidence that the upper length limit of 37 deg found by Chase et al. (1976) from Skylab data was determined simply by the typical distances between northern and southern active regions during the period of Skylab observations. We find strong support for the idea that these long interconnecting loops originate through reconnection of field lines extending from the two active regions towards and beyond the equator, and confirm the earlier finding by Canfield, Pevtsov, and McClymont (1996) that only field lines from active regions with the same chirality reconnect. As we are not aware of any longitudinal (E-W) loops of comparable lengths, we suggest that it is mainly the solar differential rotation which drives the reconnection of latitudinal (N-S) field lines.

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