A.L.P.O. solar section observations for rotations 1818-1823 (1989 Jul 19 to DEC 29)

Details A.L.P.O. solar section observations for rotations 1818-1823 (1989 Jul 19 to DEC 29) A.L.P.O. solar section observations for rotations 1818-1823 (1989 Jul 19 to DEC 29)

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jalpo..34..170h&link_type=abstract

Association of Lunar and Planetary Observers, Journal (ISSN 0039-2502), vol. 34, Nov. 1990, p. 170-176.

Astronomy and Astrophysics

Astronomy

Astronomical Photography, H Alpha Line, Solar Activity, Solar Rotation, Sunspots, Data Processing, Solar Flares, Solar Observatories

Scientific paper

This report summaries A.L.P.O. solar section observations for rotations 1818-1823 July 19 to December 29, 1989, particularly in terms of the morphology and development of sunspot groups. Twenty-four observers in five nations contributed visual drawings and integrated-light and H-alpha photographs. Solar activity tended to increase in this period; the highest rotational means were slightly lower, but the lowest means were somewhat higher, than those for the previous reporting period (Rotations 1813-1817).

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