Physics
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..187..185o&link_type=abstract
Solar Physics, v. 187, Issue 1, p. 185-205 (1999).
Physics
23
Scientific paper
The structure and variations of open field regions (OFRs) are analyzed against the solar cycle for the time interval of 1970-1996. The cycle of the large-scale magnetic field (LSMF) begins in the vicinity of maximum Wolf numbers, i.e. during the polar field reversal. At the beginning of the LSMF cycle, the polar and mid-latitude magnetic field systems are connected by a narrow bridge, but later they evolve independently. The polar field at the latitudes above 60 deg has a completely open configuration and fills the whole area of the polar caps near the cycle minimum of local fields. At this time, essentially all of the open solar flux is from the polar caps. The mid-latitude open field regions (OFRs) occur at a latitude of 30-40 deg away from solar minimum and drift slowly towards the equator to form a typical `butterfly diagram' at the periphery of the local field zone. This supports the concept of a single complex - `large-scale magnetic field - active region - coronal hole'. The rotation characteristics of OFRs have been analyzed to reveal a near solid-body rotation, much more rigid than in the case of sunspots. The rotation characteristics are shown to depend on the phase of the solar cycle.
Obridko Vladimir N.
Shelting B. D.
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