Long-term variation of sunspot latitudes

Details Long-term variation of sunspot latitudes Long-term variation of sunspot latitudes

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341l..43p&link_type=abstract

Astronomy and Astrophysics, v.341, p.L43-L46 (1999)

Astronomy and Astrophysics

Astrophysics

42

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

Scientific paper

We consider a continuous sunspot data set ranging from 1853 to 1996. The emphasis is given to long-term activity variations and north-south asymmetries. The difference of the distance between sunspot belts and equator between the northern and southern hemispheres is considered and a systematic variation is found. The period of this variation is about 8.4 sunspot cycles or about 90 years, and the amplitude is 1.3 degrees. This phenomenon could be explained by oscillation of a quadrupolar component of solar mixed parity mode magnetic field.

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