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Sunspots and active regions — April 4, 1998

April 4, 1998

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Sunspots and active regions

The following active regions with sunspot groups were visible on the Sun on April 4, 1998. Coordinates are given as of the end of the day.
Group ID Location Number of sunspots Area (msh) Type CM Passage Disappearance (W90) Reappearance (W270)
№ 8192 S32 W66 03 0020 BETA Mar 31, 1998 Apr 7, 1998 Apr 21, 1998
№ 8191 S20 E11 08 0040 BETA-GAMMA Apr 6, 1998 Apr 13, 1998 Apr 26, 1998
№ 8190 S20 W01 18 0140 BETA Apr 5, 1998 Apr 12, 1998 Apr 25, 1998
№ 8185 S25 W83 05 0210 BETA Mar 29, 1998 Apr 5, 1998 Apr 19, 1998

Solar cycle progression

The average monthly sunspot number (SSN) from January 1969 to April 1998. The gray background is the average SSN index.