Observation 21.07.2015 · Istanbul University Observatory Solar Observations

Daily Sunspot Evaluation

Observation Details Tuesday, 21 July 2015

No: 17497
Date: 2015 / 07 / 21,264
Time: 06:20 UT
Seeing: 4 / 5
Number of groups (g): 3
Number of spots (f): 24
Relative number (R): 54
L_f: 3
P₀: 6.19°
B₀: 4.87°
L₀: 274.96°
Observer: Özgecan ÖNALTAŞ

21.07.2015 photosphere drawing

Sunspot groups

No	Group (class – spots)	B	Δ L	L	Δ L_f	U	NOAA
1	CSO – 3	10	35W	310	38W	3.2
2	AX_ – 1	15	03W	278	06W	-
3	DRI – 20	17	04E	271	01E	6.4

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