The magnetic fields of active regions. VIII - Cycle latitude variations

Details The magnetic fields of active regions. VIII - Cycle latitude variations The magnetic fields of active regions. VIII - Cycle latitude variations

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..135...43h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 135, Sept. 1991, p. 43-55.

Physics

12

Magnetic Flux, Magnetic Signatures, Solar Activity Effects, Solar Cycles, Solar Magnetic Field, Magnetic Field Configurations, Meridional Flow, Solar Physics

Scientific paper

A coarse-array-magnetograph data set is analyzed to determine characteristics of magnetic regions as a function of the distance from the average latitude, zeta(0), of regions in each hemisphere, a quantity which varies during the activity cycle. Regions with normal polarity axis orientations are distributed asymmetrically about zeta(0) with the median latitude about 1 deg equatorward of zeta(0). Reversed polarity orientation regions show a somewhat broader and more symmetric distribution. Average sizes for regions at zeta of 0(zeta/0/) are nearly twice as large as those located at 10 deg latitude in either direction. Regions poleward of zeta(0) tend to exhibit a net magnetic field biased toward the following polarity, and regions equatorward of zeta(0) are biased toward the leading polarity, both by around 10 percent. Neither region growth rates nor decay rates are related to zeta. The average polarity axis tilt angles of regions are lower for regions near the equator than for those nearer the poles. The results are discussed in terms of a hypothetical subsurface magnetic flux tube which gives rise to the surface gravity.

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