Sunspot areas and tilt angles for solar cycles 7–10

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Volume 584 (December 2015)

A&A, 584 (2015) A73

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Table 2

Statistics of coverage, spot areas, groups, and tilt angles α for Schwabe’s observations in 1825−1867.

Period	Days with	Gaps longer	Gross groups	Unique groups	Groups	Group tilts with	Group tilts with
	drawings	than 5 days^a	with areas	with areas	with tilt	\|CMD\| < 60°	\|CMD\| < 60°
							and α> 3°

1825−1830	1187 (63.0%)	32	4401	945	2452	2159	1745
1831−1867	8808 (65.2%)	149	27 116	5903	20 689	17 365	13 803

Total	9995 (64.9%)	182^b	31 517	6848	23 141	19 524	15 548

Notes. CMD is the central meridian distance of the area weighted centre of a group.

^(a)

The gaps are derived only from the days for which we obtained data; if we include the unused drawings, the number of gaps longer than five days is a bit smaller than the number given in this column.

^(b)

One group is missing in the 1825−1830 number because a gap straddles 1830 and 1831.

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