A.L.P.O. Solar Section observations for rotations 1813-1817 (1989 Mar 04 to Jul 19)

Details A.L.P.O. Solar Section observations for rotations 1813-1817 (1989 Mar 04 to Jul 19) A.L.P.O. Solar Section observations for rotations 1813-1817 (1989 Mar 04 to Jul 19)

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jalpo..34...93h&link_type=abstract

Association of Lunar and Planetary Observers, Journal (ISSN 0039-2502), vol. 34, April 1990, p. 93-98.

Physics

Annual Variations, Solar Rotation, Solar Activity, Sunspots

Scientific paper

This report summarizes ALPO Solar Section observations for rotations 1813-1817 (March 4 to July 19, 1989), particularly in terms of the morphology and development of sunspot groups. Twenty-two observers in four nations contributed visual drawings and integrated-light and H-alpha photographs. Solar activity continued to increase in this period, peaking at a record high for the Solar Section during rotation 1816.

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