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 1951 266 sheets · 253 usable · mean R 82.4

DrawingDategfRReading
04.01.1951 32959 all checks consistent
07.01.1951 16373 all checks consistent
08.01.1951 45393 all checks consistent
09.01.1951 44585 all checks consistent
12.01.1951 62080 all checks consistent
13.01.1951 41252 all checks consistent
17.01.1951 ——— reading could not be verified
22.01.1951 51262 all checks consistent
23.01.1951 61777 all checks consistent
25.01.1951 45292 all checks consistent
27.01.1951 6120180 all checks consistent
29.01.1951 586136 all checks consistent
30.01.1951 573123 all checks consistent
31.01.1951 567117 all checks consistent
05.02.1951 61878 all checks consistent
06.02.1951 2323 all checks consistent
07.02.1951 5858 all checks consistent
08.02.1951 3434 all checks consistent
13.02.1951 51464 all checks consistent
14.02.1951 63191 all checks consistent
15.02.1951 62383 all checks consistent
16.02.1951 ——— reading could not be verified
19.02.1951 31242 all checks consistent
21.02.1951 22141 all checks consistent
23.02.1951 23858 all checks consistent
24.02.1951 14252 all checks consistent
25.02.1951 26282 all checks consistent
26.02.1951 26787 all checks consistent
28.02.1951 33666 all checks consistent
05.03.1951 ——— reading could not be verified
06.03.1951 41656 all checks consistent
07.03.1951 41151 all checks consistent
08.03.1951 2727 all checks consistent
09.03.1951 2929 all checks consistent
10.03.1951 2424 all checks consistent
12.03.1951 31545 all checks consistent
13.03.1951 ——— reading could not be verified
14.03.1951 31545 all checks consistent
15.03.1951 2727 all checks consistent
17.03.1951 4444 all checks consistent
18.03.1951 3434 all checks consistent
19.03.1951 51767 all checks consistent
26.03.1951 54292 all checks consistent
27.03.1951 738108 all checks consistent
28.03.1951 63595 all checks consistent
29.03.1951 52777 all checks consistent
30.03.1951 42565 all checks consistent
31.03.1951 41656 all checks consistent
01.04.1951 31646 all checks consistent
02.04.1951 2727 all checks consistent
03.04.1951 1111 all checks consistent
05.04.1951 52272 all checks consistent
06.04.1951 62585 all checks consistent
08.04.1951 63898 all checks consistent
09.04.1951 644104 all checks consistent
10.04.1951 658118 all checks consistent
11.04.1951 ——— reading could not be verified
12.04.1951 737107 all checks consistent
13.04.1951 45292 all checks consistent
14.04.1951 475115 all checks consistent
15.04.1951 388118 all checks consistent
17.04.1951 391121 all checks consistent
18.04.1951 499139 all checks consistent
19.04.1951 4113153 all checks consistent
20.04.1951 683143 all checks consistent
21.04.1951 792162 all checks consistent
22.04.1951 784154 all checks consistent
26.04.1951 559109 all checks consistent
27.04.1951 693153 all checks consistent
28.04.1951 673133 all checks consistent
29.04.1951 53888 all checks consistent
30.04.1951 52373 all checks consistent
01.05.1951 62080 all checks consistent
02.05.1951 51767 all checks consistent
03.05.1951 ——— reading could not be verified
04.05.1951 21737 all checks consistent
05.05.1951 21737 all checks consistent
06.05.1951 11222 all checks consistent
07.05.1951 2222 all checks consistent
08.05.1951 2424 all checks consistent
09.05.1951 2222 all checks consistent
11.05.1951 647107 all checks consistent
12.05.1951 877157 all checks consistent
13.05.1951 885165 all checks consistent
15.05.1951 9168258 all checks consistent
16.05.1951 7153223 all checks consistent
17.05.1951 10139239 all checks consistent
20.05.1951 9126216 all checks consistent
21.05.1951 9111201 all checks consistent
22.05.1951 966156 all checks consistent
23.05.1951 661121 all checks consistent
24.05.1951 666126 all checks consistent
25.05.1951 755125 all checks consistent
26.05.1951 644104 all checks consistent
27.05.1951 53686 all checks consistent
28.05.1951 653113 all checks consistent
29.05.1951 51868 all checks consistent
30.05.1951 41858 all checks consistent
31.05.1951 41252 all checks consistent
02.06.1951 41252 all checks consistent
03.06.1951 2828 all checks consistent
04.06.1951 41656 all checks consistent
05.06.1951 51868 all checks consistent
06.06.1951 53686 all checks consistent
07.06.1951 687147 all checks consistent
08.06.1951 6128188 all checks consistent
09.06.1951 ——— reading could not be verified
10.06.1951 592142 all checks consistent
11.06.1951 461101 all checks consistent
14.06.1951 7121191 all checks consistent
15.06.1951 646106 all checks consistent
16.06.1951 686146 all checks consistent
17.06.1951 670130 all checks consistent
18.06.1951 6104164 all checks consistent
19.06.1951 580130 all checks consistent
20.06.1951 5104154 all checks consistent
21.06.1951 598148 all checks consistent
23.06.1951 574124 all checks consistent
24.06.1951 43676 all checks consistent
25.06.1951 32050 all checks consistent
26.06.1951 71888 all checks consistent
27.06.1951 41151 all checks consistent
28.06.1951 6969 all checks consistent
29.06.1951 51767 all checks consistent
30.06.1951 2424 all checks consistent
01.07.1951 1313 all checks consistent
02.07.1951 ——— reading could not be verified
03.07.1951 5555 all checks consistent
04.07.1951 31040 all checks consistent
05.07.1951 32151 all checks consistent
06.07.1951 62585 all checks consistent
07.07.1951 72797 all checks consistent
08.07.1951 62484 all checks consistent
09.07.1951 52979 all checks consistent
10.07.1951 990180 all checks consistent
11.07.1951 45191 all checks consistent
12.07.1951 461101 all checks consistent
13.07.1951 477117 all checks consistent
14.07.1951 45999 all checks consistent
15.07.1951 466106 all checks consistent
16.07.1951 15363 all checks consistent
17.07.1951 35787 all checks consistent
18.07.1951 21333 all checks consistent
19.07.1951 3838 all checks consistent
21.07.1951 2626 all checks consistent
22.07.1951 3939 all checks consistent
23.07.1951 52474 all checks consistent
24.07.1951 62686 all checks consistent
25.07.1951 51464 all checks consistent
26.07.1951 42464 all checks consistent
27.07.1951 53989 all checks consistent
28.07.1951 730100 all checks consistent
31.07.1951 740110 all checks consistent
01.08.1951 32353 all checks consistent
02.08.1951 52676 all checks consistent
03.08.1951 44989 all checks consistent
04.08.1951 52979 all checks consistent
05.08.1951 63999 all checks consistent
06.08.1951 646106 all checks consistent
07.08.1951 742112 all checks consistent
08.08.1951 674134 all checks consistent
09.08.1951 6106166 all checks consistent
10.08.1951 6119179 all checks consistent
11.08.1951 579129 all checks consistent
12.08.1951 654114 all checks consistent
14.08.1951 ——— reading could not be verified
15.08.1951 62484 all checks consistent
16.08.1951 41151 all checks consistent
17.08.1951 32252 all checks consistent
18.08.1951 23353 all checks consistent
19.08.1951 22949 all checks consistent
20.08.1951 22545 all checks consistent
21.08.1951 31646 all checks consistent
22.08.1951 31848 all checks consistent
23.08.1951 31444 all checks consistent
24.08.1951 41050 all checks consistent
25.08.1951 2424 all checks consistent
26.08.1951 1212 all checks consistent
27.08.1951 000 all checks consistent
28.08.1951 1616 all checks consistent
29.08.1951 1515 all checks consistent
30.08.1951 2222 all checks consistent
31.08.1951 41151 all checks consistent
01.09.1951 41252 all checks consistent
02.09.1951 62181 all checks consistent
03.09.1951 31747 all checks consistent
04.09.1951 43676 all checks consistent
05.09.1951 33767 all checks consistent
06.09.1951 54090 all checks consistent
07.09.1951 644104 all checks consistent
08.09.1951 824104 all checks consistent
09.09.1951 62383 all checks consistent
11.09.1951 850130 all checks consistent
12.09.1951 837117 all checks consistent
13.09.1951 1168178 all checks consistent
14.09.1951 ——— reading could not be verified
15.09.1951 1168178 all checks consistent
16.09.1951 1054154 all checks consistent
17.09.1951 647107 all checks consistent
18.09.1951 673133 all checks consistent
19.09.1951 670130 all checks consistent
20.09.1951 467107 all checks consistent
21.09.1951 593143 all checks consistent
22.09.1951 572122 all checks consistent
23.09.1951 861141 all checks consistent
24.09.1951 659119 all checks consistent
25.09.1951 661121 all checks consistent
26.09.1951 43171 all checks consistent
27.09.1951 52575 all checks consistent
28.09.1951 63191 all checks consistent
29.09.1951 2525 all checks consistent
30.09.1951 3737 all checks consistent
01.10.1951 31444 all checks consistent
05.10.1951 21434 all checks consistent
07.10.1951 1414 all checks consistent
08.10.1951 4545 all checks consistent
10.10.1951 52979 all checks consistent
11.10.1951 63191 all checks consistent
17.10.1951 32555 all checks consistent
18.10.1951 31747 all checks consistent
19.10.1951 45292 all checks consistent
20.10.1951 52979 all checks consistent
21.10.1951 21434 all checks consistent
22.10.1951 31343 all checks consistent
23.10.1951 3838 all checks consistent
24.10.1951 ——— reading could not be verified
25.10.1951 2727 all checks consistent
26.10.1951 4747 all checks consistent
27.10.1951 ——— reading could not be verified
31.10.1951 464104 all checks consistent
01.11.1951 44383 all checks consistent
02.11.1951 53585 all checks consistent
03.11.1951 31747 all checks consistent
05.11.1951 62181 all checks consistent
06.11.1951 52171 all checks consistent
07.11.1951 62383 all checks consistent
08.11.1951 21333 all checks consistent
09.11.1951 53181 all checks consistent
10.11.1951 43979 all checks consistent
12.11.1951 43777 all checks consistent
13.11.1951 52474 all checks consistent
14.11.1951 42464 all checks consistent
16.11.1951 3737 all checks consistent
19.11.1951 61979 all checks consistent
20.11.1951 51969 all checks consistent
21.11.1951 3939 all checks consistent
22.11.1951 41252 all checks consistent
23.11.1951 51868 all checks consistent
26.11.1951 72090 all checks consistent
28.11.1951 63191 all checks consistent
01.12.1951 2929 all checks consistent
02.12.1951 3636 all checks consistent
04.12.1951 2424 all checks consistent
05.12.1951 4747 all checks consistent
06.12.1951 ——— reading could not be verified
07.12.1951 41959 all checks consistent
08.12.1951 41757 all checks consistent
09.12.1951 3939 all checks consistent
10.12.1951 41555 all checks consistent
11.12.1951 2929 all checks consistent
15.12.1951 3939 all checks consistent
16.12.1951 23454 all checks consistent
22.12.1951 35484 all checks consistent
23.12.1951 22848 all checks consistent
24.12.1951 34575 all checks consistent
25.12.1951 13747 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.