Istanbul University Faculty of Science

SOLAR OBSERVATIONS

Istanbul University Observatory · Sunspot observations since 1950

Observatory

Sunspot Records 1950–2007

13,360 / 15,663 sheets usable

Years usable / all sheets

19502 / 9 1951253 / 266 1952270 / 291 1953287 / 303 1954286 / 292 1955284 / 299 1956270 / 299 1957262 / 299 1958264 / 307 1959231 / 280 1960235 / 271 1961233 / 261 1962210 / 254 1963194 / 258 1964246 / 274 1965245 / 280 1966224 / 261 1967244 / 297 1968241 / 278 1969224 / 266 1970262 / 291 1971274 / 283 1972231 / 251 1973263 / 303 1974279 / 292 1975280 / 302 1976257 / 287 1977246 / 275 1978239 / 271 1979209 / 285 1980207 / 256 1981248 / 288 1982254 / 301 1983229 / 295 1984260 / 290 1985271 / 292 1986262 / 278 1987221 / 254 1988215 / 272 1989187 / 209 1990168 / 293 1991217 / 252 1992222 / 273 1993241 / 265 1994257 / 283 1995266 / 275 1996111 / 235 1997218 / 237 1998211 / 248 1999181 / 265 2000173 / 272 2001203 / 276 200282 / 279 2003239 / 252 2004266 / 280 2005216 / 236 2006221 / 238 2007269 / 284

Sheets of 1971 283 sheets · 274 usable · mean R 89.8

DrawingDategfRReading
01.01.1971 53686 all checks consistent
02.01.1971 63696 all checks consistent
03.01.1971 62080 all checks consistent
05.01.1971 42060 all checks consistent
06.01.1971 42464 all checks consistent
15.01.1971 41151 all checks consistent
16.01.1971 42565 all checks consistent
17.01.1971 31646 all checks consistent
18.01.1971 63595 all checks consistent
20.01.1971 678138 all checks consistent
22.01.1971 7120190 all checks consistent
24.01.1971 852132 all checks consistent
25.01.1971 670130 counts consistent, some coordinates doubtful
26.01.1971 852132 all checks consistent
27.01.1971 742112 all checks consistent
29.01.1971 783153 all checks consistent
30.01.1971 ——— reading could not be verified
31.01.1971 695155 all checks consistent
01.02.1971 695155 all checks consistent
02.02.1971 6113173 all checks consistent
08.02.1971 72797 all checks consistent
10.02.1971 51969 all checks consistent
11.02.1971 61474 all checks consistent
12.02.1971 61272 all checks consistent
13.02.1971 62888 all checks consistent
14.02.1971 53282 counts consistent, some coordinates doubtful
15.02.1971 52373 all checks consistent
17.02.1971 63696 all checks consistent
18.02.1971 63292 all checks consistent
19.02.1971 738108 all checks consistent
21.02.1971 736106 all checks consistent
23.02.1971 642102 all checks consistent
24.02.1971 754124 all checks consistent
27.02.1971 654114 all checks consistent
28.02.1971 846126 all checks consistent
04.03.1971 823103 all checks consistent
05.03.1971 62989 all checks consistent
06.03.1971 61878 all checks consistent
07.03.1971 51565 all checks consistent
11.03.1971 43171 all checks consistent
12.03.1971 63999 all checks consistent
14.03.1971 838118 all checks consistent
15.03.1971 738108 all checks consistent
16.03.1971 858138 all checks consistent
17.03.1971 738108 all checks consistent
19.03.1971 51363 all checks consistent
20.03.1971 53686 all checks consistent
21.03.1971 53282 counts consistent, some coordinates doubtful
22.03.1971 43474 all checks consistent
23.03.1971 52979 all checks consistent
24.03.1971 32151 all checks consistent
27.03.1971 53282 all checks consistent
28.03.1971 52575 all checks consistent
29.03.1971 43979 all checks consistent
30.03.1971 63090 all checks consistent
31.03.1971 62383 all checks consistent
01.04.1971 63595 all checks consistent
02.04.1971 42262 all checks consistent
04.04.1971 81494 all checks consistent
05.04.1971 ——— reading could not be verified
06.04.1971 62686 all checks consistent
07.04.1971 62484 all checks consistent
10.04.1971 61373 all checks consistent
13.04.1971 1051151 all checks consistent
15.04.1971 1171181 all checks consistent
16.04.1971 883163 all checks consistent
17.04.1971 890170 all checks consistent
18.04.1971 970160 all checks consistent
19.04.1971 1195205 all checks consistent
22.04.1971 839119 all checks consistent
23.04.1971 62080 all checks consistent
24.04.1971 72393 all checks consistent
25.04.1971 42666 all checks consistent
26.04.1971 45494 all checks consistent
27.04.1971 44888 all checks consistent
28.04.1971 44181 all checks consistent
29.04.1971 32252 all checks consistent
30.04.1971 41555 all checks consistent
01.05.1971 51666 all checks consistent
02.05.1971 41656 all checks consistent
03.05.1971 62181 all checks consistent
04.05.1971 52878 all checks consistent
05.05.1971 ——— reading could not be verified
07.05.1971 32555 all checks consistent
08.05.1971 33969 all checks consistent
09.05.1971 43373 counts consistent, some coordinates doubtful
11.05.1971 53383 all checks consistent
12.05.1971 54494 all checks consistent
13.05.1971 943133 all checks consistent
14.05.1971 745115 all checks consistent
15.05.1971 53282 all checks consistent
16.05.1971 833113 all checks consistent
17.05.1971 62080 all checks consistent
18.05.1971 61676 all checks consistent
19.05.1971 3838 all checks consistent
20.05.1971 51565 all checks consistent
21.05.1971 41555 all checks consistent
22.05.1971 4848 all checks consistent
23.05.1971 2222 all checks consistent
24.05.1971 2424 all checks consistent
25.05.1971 11323 all checks consistent
26.05.1971 11525 all checks consistent
27.05.1971 23959 all checks consistent
28.05.1971 ——— reading could not be verified
29.05.1971 54292 all checks consistent
30.05.1971 ——— reading could not be verified
31.05.1971 51767 all checks consistent
01.06.1971 52878 all checks consistent
02.06.1971 41656 all checks consistent
04.06.1971 41353 all checks consistent
05.06.1971 51161 all checks consistent
06.06.1971 2828 all checks consistent
07.06.1971 41454 all checks consistent
08.06.1971 5959 all checks consistent
09.06.1971 3737 all checks consistent
10.06.1971 31444 all checks consistent
11.06.1971 3939 all checks consistent
12.06.1971 42262 all checks consistent
13.06.1971 21434 all checks consistent
14.06.1971 41757 all checks consistent
15.06.1971 41656 all checks consistent
16.06.1971 41555 all checks consistent
17.06.1971 61979 all checks consistent
18.06.1971 41959 all checks consistent
19.06.1971 21333 all checks consistent
20.06.1971 41353 all checks consistent
21.06.1971 31848 all checks consistent
22.06.1971 32555 all checks consistent
23.06.1971 63797 all checks consistent
24.06.1971 648108 all checks consistent
25.06.1971 43979 counts consistent, some coordinates doubtful
26.06.1971 664124 all checks consistent
27.06.1971 863143 all checks consistent
28.06.1971 ——— reading could not be verified
29.06.1971 859139 all checks consistent
30.06.1971 784154 all checks consistent
01.07.1971 773143 all checks consistent
02.07.1971 671131 all checks consistent
03.07.1971 776146 all checks consistent
04.07.1971 690150 all checks consistent
05.07.1971 644104 all checks consistent
06.07.1971 54898 all checks consistent
07.07.1971 557107 all checks consistent
08.07.1971 644104 all checks consistent
09.07.1971 53383 all checks consistent
10.07.1971 467107 all checks consistent
11.07.1971 33363 all checks consistent
12.07.1971 676136 all checks consistent
13.07.1971 466106 all checks consistent
14.07.1971 54494 all checks consistent
15.07.1971 750120 all checks consistent
21.07.1971 956146 all checks consistent
22.07.1971 1049149 all checks consistent
25.07.1971 1163173 all checks consistent
26.07.1971 739109 all checks consistent
27.07.1971 844124 all checks consistent
28.07.1971 740110 all checks consistent
30.07.1971 837117 all checks consistent
31.07.1971 63292 all checks consistent
01.08.1971 1032132 all checks consistent
02.08.1971 71585 all checks consistent
03.08.1971 72090 all checks consistent
04.08.1971 51767 all checks consistent
05.08.1971 927117 counts consistent, some coordinates doubtful
06.08.1971 31545 all checks consistent
07.08.1971 42565 counts consistent, some coordinates doubtful
08.08.1971 54595 all checks consistent
09.08.1971 44989 all checks consistent
10.08.1971 645105 all checks consistent
11.08.1971 63595 all checks consistent
12.08.1971 649109 all checks consistent
13.08.1971 72393 all checks consistent
14.08.1971 61979 counts consistent, some coordinates doubtful
15.08.1971 5959 all checks consistent
16.08.1971 62585 all checks consistent
17.08.1971 62181 all checks consistent
18.08.1971 731101 all checks consistent
19.08.1971 53686 all checks consistent
20.08.1971 679139 all checks consistent
21.08.1971 680140 all checks consistent
22.08.1971 482122 all checks consistent
23.08.1971 5101151 all checks consistent
24.08.1971 482122 all checks consistent
25.08.1971 5108158 all checks consistent
26.08.1971 471111 all checks consistent
27.08.1971 24262 all checks consistent
28.08.1971 24464 all checks consistent
30.08.1971 3333 all checks consistent
31.08.1971 4848 all checks consistent
01.09.1971 3434 all checks consistent
02.09.1971 31444 all checks consistent
03.09.1971 22242 all checks consistent
04.09.1971 22545 all checks consistent
05.09.1971 23050 all checks consistent
06.09.1971 54494 counts consistent, some coordinates doubtful
08.09.1971 43878 all checks consistent
09.09.1971 51767 all checks consistent
10.09.1971 2222 all checks consistent
11.09.1971 2424 all checks consistent
12.09.1971 31040 all checks consistent
13.09.1971 51969 all checks consistent
14.09.1971 62888 counts consistent, some coordinates doubtful
15.09.1971 751121 all checks consistent
16.09.1971 751121 all checks consistent
17.09.1971 730100 all checks consistent
18.09.1971 845125 all checks consistent
19.09.1971 735105 all checks consistent
20.09.1971 42969 all checks consistent
21.09.1971 33060 all checks consistent
22.09.1971 731101 all checks consistent
24.09.1971 ——— reading could not be verified
25.09.1971 32050 all checks consistent
26.09.1971 2929 all checks consistent
27.09.1971 33060 all checks consistent
28.09.1971 44181 all checks consistent
29.09.1971 44282 all checks consistent
30.09.1971 646106 all checks consistent
01.10.1971 63999 all checks consistent
02.10.1971 646106 all checks consistent
03.10.1971 45999 all checks consistent
04.10.1971 42363 all checks consistent
05.10.1971 63999 all checks consistent
07.10.1971 31343 all checks consistent
11.10.1971 31343 all checks consistent
12.10.1971 52373 all checks consistent
13.10.1971 2727 all checks consistent
14.10.1971 41757 all checks consistent
15.10.1971 1616 all checks consistent
16.10.1971 3939 all checks consistent
20.10.1971 42969 all checks consistent
21.10.1971 45292 all checks consistent
22.10.1971 44585 counts consistent, some coordinates doubtful
23.10.1971 478118 all checks consistent
24.10.1971 45797 all checks consistent
25.10.1971 642102 all checks consistent
26.10.1971 550100 all checks consistent
27.10.1971 739109 all checks consistent
30.10.1971 32252 all checks consistent
31.10.1971 52575 all checks consistent
04.11.1971 938128 all checks consistent
05.11.1971 740110 all checks consistent
06.11.1971 63090 all checks consistent
07.11.1971 ——— reading could not be verified
08.11.1971 52878 all checks consistent
09.11.1971 732102 all checks consistent
10.11.1971 41858 all checks consistent
11.11.1971 61777 all checks consistent
12.11.1971 4848 all checks consistent
13.11.1971 5959 all checks consistent
14.11.1971 3636 all checks consistent
16.11.1971 2525 all checks consistent
17.11.1971 21232 all checks consistent
18.11.1971 41656 counts consistent, some coordinates doubtful
19.11.1971 3838 all checks consistent
20.11.1971 62585 all checks consistent
23.11.1971 735105 all checks consistent
25.11.1971 859139 all checks consistent
28.11.1971 798168 all checks consistent
29.11.1971 ——— reading could not be verified
30.11.1971 748118 all checks consistent
01.12.1971 857137 all checks consistent
02.12.1971 63393 all checks consistent
03.12.1971 63292 all checks consistent
04.12.1971 42262 all checks consistent
06.12.1971 743113 all checks consistent
07.12.1971 742112 all checks consistent
08.12.1971 746116 counts consistent, some coordinates doubtful
09.12.1971 953143 counts consistent, some coordinates doubtful
12.12.1971 964154 all checks consistent
14.12.1971 738108 counts consistent, some coordinates doubtful
16.12.1971 838118 all checks consistent
17.12.1971 1060160 all checks consistent
18.12.1971 1170180 all checks consistent
20.12.1971 951141 all checks consistent
22.12.1971 54797 all checks consistent
23.12.1971 668128 all checks consistent
25.12.1971 865145 counts consistent, some coordinates doubtful
26.12.1971 644104 all checks consistent
27.12.1971 733103 all checks consistent
28.12.1971 72292 all checks consistent
29.12.1971 52676 all checks consistent
30.12.1971 42666 all checks consistent
31.12.1971 53282 all checks consistent

Click a date for the group table and the drawing. “—”: the reading of the sheet could not be verified, numbers are not shown; see the drawing.