Unveiling the butterfly diagram structure

Details Unveiling the butterfly diagram structure Unveiling the butterfly diagram structure

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..274..195t&link_type=abstract

Advances in Plasma Astrophysics, Proceedings of the International Astronomical Union, IAU Symposium, Volume 274, p. 195-197

Astronomy and Astrophysics

Astrophysics

1

Sun: Activity, Sun: Magnetic Fields, Sun: Sunspots

Scientific paper

A Butterfly Diagram showing the spotted area distribution is presented. The diagram reveals that most of the spotted area is concentrated in few, small portions (``knots'') of the butterfly wings. A knot may appear at either lower or higher latitudes than previous ones, in a seemingly random way; accordingly, the spot mean latitude abruptly drifts equatorward or even poleward at any knot activation, in spite of any smoothing procedure. The description, assuming that spots scatter around the ``spot mean latitude'' steadily drifting equatorward, is questioned. In a relevant number of cases, knots appear to be arranged in two roughly parallel, oblique streams, the ``spot mean latitude'' being located in the underspotted band lying between these streams.

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