Physics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jalpo..33...78h&link_type=abstract
Association of Lunar and Planetary Observers, Journal (ISSN 0039-2502), vol. 33, April 1989, p. 78-84.
Physics
Solar Rotation, Sunspots, H Alpha Line, Solar Cycles
Scientific paper
A.L.P.O. Solar Section observations for Rotation Numbers 1798-1802 are summarized in terms of the morphology and development of sunspot groups. Nine observers in four nations contributed visual drawings and photographs in both integrated and H-alpha light. Solar activity continued to increase during this reporting period, reaching a maximum during Rotations 1800 and 1801 (March-April, 1988).
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