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 1972 251 sheets · 231 usable · mean R 89.8

DrawingDategfRReading
01.01.1972 51868 all checks consistent
02.01.1972 4747 all checks consistent
05.01.1972 61777 all checks consistent
06.01.1972 52575 all checks consistent
08.01.1972 51060 all checks consistent
09.01.1972 51363 all checks consistent
10.01.1972 31545 all checks consistent
13.01.1972 21535 all checks consistent
14.01.1972 41353 all checks consistent
15.01.1972 31747 all checks consistent
16.01.1972 32757 all checks consistent
17.01.1972 32757 all checks consistent
18.01.1972 ——— reading could not be verified
22.01.1972 743113 all checks consistent
26.01.1972 643103 all checks consistent
27.01.1972 1053153 all checks consistent
28.01.1972 1046146 all checks consistent
31.01.1972 43474 all checks consistent
01.02.1972 62181 all checks consistent
02.02.1972 52272 all checks consistent
04.02.1972 42969 all checks consistent
05.02.1972 51969 all checks consistent
07.02.1972 52070 all checks consistent
08.02.1972 51767 all checks consistent
09.02.1972 51969 all checks consistent
10.02.1972 41555 all checks consistent
11.02.1972 42060 all checks consistent
12.02.1972 42767 all checks consistent
14.02.1972 62787 all checks consistent
15.02.1972 767137 counts consistent, some coordinates doubtful
19.02.1972 8114194 all checks consistent
20.02.1972 9113203 all checks consistent
21.02.1972 759129 counts consistent, some coordinates doubtful
22.02.1972 1085185 all checks consistent
23.02.1972 771141 all checks consistent
25.02.1972 54191 all checks consistent
27.02.1972 748118 counts consistent, some coordinates doubtful
28.02.1972 935125 all checks consistent
29.02.1972 737107 all checks consistent
02.03.1972 640100 all checks consistent
06.03.1972 44181 all checks consistent
10.03.1972 750120 all checks consistent
11.03.1972 63393 all checks consistent
13.03.1972 735105 all checks consistent
14.03.1972 839119 all checks consistent
15.03.1972 ——— reading could not be verified
16.03.1972 845125 all checks consistent
17.03.1972 857137 all checks consistent
18.03.1972 1039139 all checks consistent
19.03.1972 1055155 all checks consistent
20.03.1972 968158 all checks consistent
21.03.1972 670130 all checks consistent
22.03.1972 564114 all checks consistent
23.03.1972 894174 all checks consistent
24.03.1972 874154 all checks consistent
25.03.1972 951141 all checks consistent
26.03.1972 53484 all checks consistent
27.03.1972 ——— reading could not be verified
28.03.1972 31040 all checks consistent
29.03.1972 41353 all checks consistent
30.03.1972 41151 all checks consistent
31.03.1972 52070 all checks consistent
01.04.1972 51666 all checks consistent
03.04.1972 63292 all checks consistent
04.04.1972 31949 all checks consistent
05.04.1972 43070 all checks consistent
06.04.1972 61979 all checks consistent
07.04.1972 63898 all checks consistent
08.04.1972 741111 all checks consistent
09.04.1972 940130 all checks consistent
10.04.1972 53484 all checks consistent
11.04.1972 654114 all checks consistent
12.04.1972 755125 all checks consistent
13.04.1972 641101 all checks consistent
14.04.1972 42363 all checks consistent
15.04.1972 62686 all checks consistent
16.04.1972 53181 all checks consistent
17.04.1972 43878 counts consistent, some coordinates doubtful
18.04.1972 653113 all checks consistent
19.04.1972 44383 all checks consistent
20.04.1972 53585 all checks consistent
21.04.1972 739109 all checks consistent
23.04.1972 753123 all checks consistent
24.04.1972 738108 all checks consistent
25.04.1972 934124 all checks consistent
26.04.1972 834114 all checks consistent
28.04.1972 62080 all checks consistent
01.05.1972 3737 all checks consistent
03.05.1972 2626 all checks consistent
04.05.1972 21737 counts consistent, some coordinates doubtful
07.05.1972 681141 all checks consistent
08.05.1972 45696 all checks consistent
09.05.1972 663123 all checks consistent
10.05.1972 789159 all checks consistent
11.05.1972 764134 all checks consistent
12.05.1972 665125 all checks consistent
13.05.1972 653113 all checks consistent
14.05.1972 ——— reading could not be verified
15.05.1972 898178 all checks consistent
16.05.1972 8115195 all checks consistent
17.05.1972 ——— reading could not be verified
18.05.1972 871151 counts consistent, some coordinates doubtful
19.05.1972 751121 all checks consistent
20.05.1972 685145 all checks consistent
21.05.1972 45292 all checks consistent
22.05.1972 ——— reading could not be verified
23.05.1972 42464 all checks consistent
24.05.1972 53181 all checks consistent
11.07.1972 53080 all checks consistent
12.07.1972 736106 all checks consistent
13.07.1972 1126136 all checks consistent
14.07.1972 ——— reading could not be verified
17.07.1972 53181 all checks consistent
18.07.1972 52676 all checks consistent
19.07.1972 ——— reading could not be verified
20.07.1972 63595 all checks consistent
21.07.1972 640100 all checks consistent
22.07.1972 653113 all checks consistent
23.07.1972 61575 all checks consistent
24.07.1972 4848 all checks consistent
25.07.1972 51565 all checks consistent
26.07.1972 961151 all checks consistent
27.07.1972 860140 all checks consistent
28.07.1972 777147 all checks consistent
29.07.1972 755125 all checks consistent
30.07.1972 751121 all checks consistent
31.07.1972 978168 all checks consistent
01.08.1972 1161171 all checks consistent
02.08.1972 849129 all checks consistent
03.08.1972 ——— reading could not be verified
04.08.1972 ——— reading could not be verified
05.08.1972 861141 all checks consistent
06.08.1972 ——— reading could not be verified
07.08.1972 550100 all checks consistent
08.08.1972 42767 all checks consistent
09.08.1972 42868 all checks consistent
10.08.1972 31848 all checks consistent
11.08.1972 ——— reading could not be verified
12.08.1972 62383 all checks consistent
13.08.1972 72696 all checks consistent
14.08.1972 51969 counts consistent, some coordinates doubtful
15.08.1972 41151 all checks consistent
16.08.1972 52575 all checks consistent
17.08.1972 53888 all checks consistent
18.08.1972 44080 counts consistent, some coordinates doubtful
19.08.1972 53585 all checks consistent
20.08.1972 835115 counts consistent, some coordinates doubtful
21.08.1972 54595 all checks consistent
22.08.1972 746116 all checks consistent
23.08.1972 654114 all checks consistent
24.08.1972 ——— reading could not be verified
25.08.1972 757127 all checks consistent
27.08.1972 958148 all checks consistent
28.08.1972 1183193 all checks consistent
29.08.1972 13106236 counts consistent, some coordinates doubtful
30.08.1972 13102232 all checks consistent
31.08.1972 1168178 all checks consistent
01.09.1972 972162 all checks consistent
02.09.1972 950140 all checks consistent
03.09.1972 742112 all checks consistent
04.09.1972 733103 all checks consistent
05.09.1972 829109 all checks consistent
06.09.1972 955145 all checks consistent
07.09.1972 ——— reading could not be verified
08.09.1972 63999 all checks consistent
09.09.1972 ——— reading could not be verified
10.09.1972 43272 all checks consistent
11.09.1972 72696 all checks consistent
12.09.1972 41555 all checks consistent
13.09.1972 31242 all checks consistent
14.09.1972 ——— reading could not be verified
15.09.1972 52979 counts consistent, some coordinates doubtful
16.09.1972 649109 all checks consistent
17.09.1972 52575 all checks consistent
18.09.1972 41858 all checks consistent
19.09.1972 4747 all checks consistent
20.09.1972 52979 all checks consistent
21.09.1972 53787 all checks consistent
22.09.1972 643103 all checks consistent
23.09.1972 45797 all checks consistent
24.09.1972 559109 all checks consistent
25.09.1972 ——— reading could not be verified
27.09.1972 568118 all checks consistent
28.09.1972 52070 all checks consistent
01.10.1972 52474 counts consistent, some coordinates doubtful
02.10.1972 62484 all checks consistent
03.10.1972 739109 all checks consistent
04.10.1972 61676 all checks consistent
05.10.1972 71585 all checks consistent
06.10.1972 72090 all checks consistent
07.10.1972 ——— reading could not be verified
08.10.1972 71181 all checks consistent
09.10.1972 4949 all checks consistent
10.10.1972 31040 counts consistent, some coordinates doubtful
11.10.1972 42161 all checks consistent
12.10.1972 4747 all checks consistent
13.10.1972 3535 all checks consistent
14.10.1972 000 all checks consistent
20.10.1972 33565 all checks consistent
21.10.1972 ——— reading could not be verified
23.10.1972 72393 all checks consistent
24.10.1972 737107 all checks consistent
27.10.1972 757127 all checks consistent
28.10.1972 584134 all checks consistent
29.10.1972 35787 all checks consistent
30.10.1972 567117 all checks consistent
31.10.1972 53282 all checks consistent
01.11.1972 53686 all checks consistent
02.11.1972 43070 all checks consistent
04.11.1972 1818 all checks consistent
05.11.1972 21030 all checks consistent
06.11.1972 1212 all checks consistent
09.11.1972 1111 all checks consistent
11.11.1972 1616 all checks consistent
12.11.1972 41050 all checks consistent
14.11.1972 ——— reading could not be verified
15.11.1972 2323 all checks consistent
16.11.1972 2525 all checks consistent
17.11.1972 2626 all checks consistent
18.11.1972 2525 all checks consistent
19.11.1972 41353 all checks consistent
21.11.1972 62181 all checks consistent
22.11.1972 62686 all checks consistent
23.11.1972 735105 all checks consistent
24.11.1972 63090 all checks consistent
25.11.1972 41454 all checks consistent
27.11.1972 51565 all checks consistent
28.11.1972 51161 all checks consistent
29.11.1972 41252 all checks consistent
30.11.1972 41252 all checks consistent
01.12.1972 3838 all checks consistent
02.12.1972 3838 all checks consistent
03.12.1972 31141 all checks consistent
04.12.1972 3636 all checks consistent
05.12.1972 1111 all checks consistent
06.12.1972 2626 all checks consistent
07.12.1972 2929 all checks consistent
08.12.1972 11323 all checks consistent
09.12.1972 12030 all checks consistent
10.12.1972 33464 all checks consistent
12.12.1972 52171 all checks consistent
14.12.1972 53686 all checks consistent
15.12.1972 52373 all checks consistent
17.12.1972 41656 all checks consistent
22.12.1972 32353 all checks consistent
23.12.1972 42060 all checks consistent
24.12.1972 21232 all checks consistent
25.12.1972 32454 all checks consistent
28.12.1972 2323 all checks consistent
30.12.1972 21030 all checks consistent
31.12.1972 31141 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.