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 1976 287 sheets · 257 usable · mean R 15.1

DrawingDategfRReading
01.01.1976 000 all checks consistent
02.01.1976 000 all checks consistent
03.01.1976 000 all checks consistent
05.01.1976 000 all checks consistent
06.01.1976 000 all checks consistent
07.01.1976 000 all checks consistent
08.01.1976 000 all checks consistent
09.01.1976 000 all checks consistent
10.01.1976 000 all checks consistent
11.01.1976 000 all checks consistent
12.01.1976 2323 all checks consistent
13.01.1976 21535 all checks consistent
14.01.1976 21131 all checks consistent
15.01.1976 21939 all checks consistent
18.01.1976 1818 all checks consistent
19.01.1976 11121 all checks consistent
20.01.1976 1616 all checks consistent
21.01.1976 1616 all checks consistent
22.01.1976 ——— reading could not be verified
23.01.1976 1414 all checks consistent
24.01.1976 000 all checks consistent
26.01.1976 000 all checks consistent
27.01.1976 2222 all checks consistent
28.01.1976 000 all checks consistent
29.01.1976 000 all checks consistent
31.01.1976 000 all checks consistent
02.02.1976 000 all checks consistent
05.02.1976 000 all checks consistent
06.02.1976 000 all checks consistent
09.02.1976 000 all checks consistent
10.02.1976 000 all checks consistent
11.02.1976 000 all checks consistent
12.02.1976 000 all checks consistent
13.02.1976 1818 all checks consistent
15.02.1976 11424 all checks consistent
18.02.1976 2727 all checks consistent
19.02.1976 1515 all checks consistent
20.02.1976 1818 all checks consistent
24.02.1976 000 all checks consistent
25.02.1976 000 all checks consistent
26.02.1976 000 all checks consistent
27.02.1976 000 all checks consistent
28.02.1976 000 all checks consistent
29.02.1976 000 all checks consistent
01.03.1976 000 all checks consistent
02.03.1976 000 all checks consistent
03.03.1976 000 all checks consistent
05.03.1976 000 all checks consistent
07.03.1976 2525 all checks consistent
09.03.1976 1616 all checks consistent
10.03.1976 1616 all checks consistent
11.03.1976 1717 all checks consistent
15.03.1976 1111 all checks consistent
17.03.1976 21636 counts consistent, some coordinates doubtful
20.03.1976 23454 all checks consistent
21.03.1976 12333 all checks consistent
23.03.1976 12939 all checks consistent
24.03.1976 ——— reading could not be verified
25.03.1976 2828 all checks consistent
26.03.1976 11121 all checks consistent
31.03.1976 21636 all checks consistent
01.04.1976 21737 all checks consistent
04.04.1976 1313 all checks consistent
05.04.1976 1515 all checks consistent
06.04.1976 1414 all checks consistent
07.04.1976 ——— reading could not be verified
08.04.1976 000 all checks consistent
09.04.1976 1111 all checks consistent
10.04.1976 1414 all checks consistent
12.04.1976 1212 all checks consistent
14.04.1976 21333 all checks consistent
18.04.1976 3838 all checks consistent
19.04.1976 3838 counts consistent, some coordinates doubtful
20.04.1976 31343 all checks consistent
21.04.1976 31646 all checks consistent
22.04.1976 2323 all checks consistent
23.04.1976 2424 all checks consistent
24.04.1976 2323 all checks consistent
25.04.1976 2424 all checks consistent
27.04.1976 21636 all checks consistent
28.04.1976 21333 all checks consistent
29.04.1976 11323 all checks consistent
30.04.1976 11525 all checks consistent
02.05.1976 11424 all checks consistent
03.05.1976 1616 all checks consistent
04.05.1976 000 all checks consistent
05.05.1976 1111 all checks consistent
06.05.1976 1212 all checks consistent
07.05.1976 ——— reading could not be verified
08.05.1976 1212 all checks consistent
09.05.1976 1111 all checks consistent
10.05.1976 1111 all checks consistent
12.05.1976 1212 all checks consistent
13.05.1976 2323 all checks consistent
14.05.1976 2424 all checks consistent
15.05.1976 1212 all checks consistent
16.05.1976 1515 all checks consistent
17.05.1976 ——— reading could not be verified
18.05.1976 1212 all checks consistent
19.05.1976 1111 all checks consistent
20.05.1976 2222 all checks consistent
21.05.1976 2222 all checks consistent
22.05.1976 1313 all checks consistent
23.05.1976 2323 all checks consistent
24.05.1976 1212 all checks consistent
25.05.1976 000 all checks consistent
26.05.1976 1111 all checks consistent
27.05.1976 1111 all checks consistent
28.05.1976 000 all checks consistent
29.05.1976 000 all checks consistent
30.05.1976 000 all checks consistent
31.05.1976 000 all checks consistent
01.06.1976 000 all checks consistent
02.06.1976 000 all checks consistent
03.06.1976 000 all checks consistent
04.06.1976 000 all checks consistent
05.06.1976 000 all checks consistent
06.06.1976 ——— reading could not be verified
07.06.1976 000 all checks consistent
08.06.1976 1616 all checks consistent
09.06.1976 1515 all checks consistent
10.06.1976 1414 all checks consistent
11.06.1976 000 all checks consistent
12.06.1976 ——— reading could not be verified
13.06.1976 ——— reading could not be verified
14.06.1976 2525 all checks consistent
15.06.1976 1818 all checks consistent
16.06.1976 11020 all checks consistent
17.06.1976 21838 all checks consistent
18.06.1976 12939 all checks consistent
19.06.1976 12535 all checks consistent
20.06.1976 ——— reading could not be verified
21.06.1976 ——— reading could not be verified
22.06.1976 32454 all checks consistent
23.06.1976 31343 all checks consistent
24.06.1976 3838 all checks consistent
25.06.1976 2323 all checks consistent
26.06.1976 1111 all checks consistent
27.06.1976 1515 all checks consistent
28.06.1976 1313 all checks consistent
29.06.1976 ——— reading could not be verified
30.06.1976 1212 all checks consistent
01.07.1976 1111 all checks consistent
02.07.1976 1111 all checks consistent
03.07.1976 ——— reading could not be verified
04.07.1976 1212 all checks consistent
05.07.1976 1414 all checks consistent
06.07.1976 1515 all checks consistent
07.07.1976 1111 all checks consistent
08.07.1976 1111 all checks consistent
09.07.1976 000 all checks consistent
10.07.1976 000 all checks consistent
11.07.1976 000 all checks consistent
12.07.1976 000 all checks consistent
13.07.1976 000 all checks consistent
14.07.1976 000 all checks consistent
15.07.1976 000 all checks consistent
16.07.1976 000 all checks consistent
17.07.1976 000 all checks consistent
18.07.1976 000 all checks consistent
19.07.1976 000 all checks consistent
20.07.1976 000 all checks consistent
21.07.1976 000 all checks consistent
22.07.1976 000 all checks consistent
23.07.1976 000 all checks consistent
24.07.1976 000 all checks consistent
25.07.1976 000 all checks consistent
26.07.1976 000 all checks consistent
27.07.1976 000 all checks consistent
28.07.1976 000 all checks consistent
29.07.1976 000 all checks consistent
30.07.1976 000 all checks consistent
01.08.1976 1212 all checks consistent
02.08.1976 1111 all checks consistent
04.08.1976 1111 all checks consistent
05.08.1976 1717 all checks consistent
06.08.1976 1313 all checks consistent
08.08.1976 11323 all checks consistent
09.08.1976 ——— reading could not be verified
10.08.1976 21535 all checks consistent
11.08.1976 21333 all checks consistent
12.08.1976 2828 all checks consistent
13.08.1976 ——— reading could not be verified
14.08.1976 1414 all checks consistent
15.08.1976 1111 all checks consistent
16.08.1976 1818 all checks consistent
17.08.1976 ——— reading could not be verified
18.08.1976 13242 all checks consistent
19.08.1976 22444 all checks consistent
20.08.1976 2828 all checks consistent
21.08.1976 1111 all checks consistent
23.08.1976 1212 all checks consistent
24.08.1976 ——— reading could not be verified
25.08.1976 1515 all checks consistent
26.08.1976 1212 all checks consistent
27.08.1976 1212 all checks consistent
28.08.1976 000 all checks consistent
29.08.1976 ——— reading could not be verified
30.08.1976 1111 all checks consistent
31.08.1976 1111 all checks consistent
01.09.1976 21030 all checks consistent
02.09.1976 2727 all checks consistent
03.09.1976 3535 all checks consistent
04.09.1976 31040 all checks consistent
05.09.1976 1616 all checks consistent
06.09.1976 1111 all checks consistent
07.09.1976 ——— reading could not be verified
08.09.1976 1111 all checks consistent
09.09.1976 2323 all checks consistent
10.09.1976 22141 all checks consistent
11.09.1976 12636 all checks consistent
12.09.1976 ——— reading could not be verified
13.09.1976 21636 all checks consistent
14.09.1976 1313 all checks consistent
15.09.1976 2828 all checks consistent
16.09.1976 2424 all checks consistent
17.09.1976 1616 all checks consistent
18.09.1976 1212 all checks consistent
19.09.1976 1212 all checks consistent
22.09.1976 000 all checks consistent
25.09.1976 2222 all checks consistent
26.09.1976 2323 all checks consistent
28.09.1976 ——— reading could not be verified
29.09.1976 3333 all checks consistent
30.09.1976 3333 all checks consistent
01.10.1976 31343 all checks consistent
02.10.1976 3535 all checks consistent
03.10.1976 3838 all checks consistent
04.10.1976 3535 all checks consistent
05.10.1976 3333 all checks consistent
06.10.1976 3636 all checks consistent
07.10.1976 2222 all checks consistent
08.10.1976 1212 all checks consistent
09.10.1976 1212 all checks consistent
10.10.1976 000 all checks consistent
11.10.1976 000 all checks consistent
12.10.1976 2323 all checks consistent
13.10.1976 2323 all checks consistent
14.10.1976 21333 all checks consistent
15.10.1976 21535 all checks consistent
16.10.1976 21434 all checks consistent
17.10.1976 ——— reading could not be verified
18.10.1976 1717 all checks consistent
19.10.1976 11424 all checks consistent
21.10.1976 2222 all checks consistent
22.10.1976 2525 all checks consistent
27.10.1976 21535 all checks consistent
28.10.1976 1313 all checks consistent
30.10.1976 1111 all checks consistent
31.10.1976 000 all checks consistent
03.11.1976 000 all checks consistent
04.11.1976 000 all checks consistent
05.11.1976 000 all checks consistent
06.11.1976 ——— reading could not be verified
12.11.1976 000 all checks consistent
13.11.1976 000 all checks consistent
14.11.1976 000 all checks consistent
15.11.1976 ——— reading could not be verified
16.11.1976 000 all checks consistent
17.11.1976 1111 all checks consistent
19.11.1976 ——— reading could not be verified
20.11.1976 1919 all checks consistent
21.11.1976 1111 all checks consistent
25.11.1976 ——— reading could not be verified
26.11.1976 1212 all checks consistent
28.11.1976 1111 all checks consistent
30.11.1976 000 all checks consistent
01.12.1976 000 all checks consistent
02.12.1976 000 all checks consistent
04.12.1976 000 all checks consistent
05.12.1976 000 all checks consistent
07.12.1976 000 all checks consistent
08.12.1976 ——— reading could not be verified
09.12.1976 21333 all checks consistent
10.12.1976 12434 all checks consistent
11.12.1976 11222 all checks consistent
14.12.1976 21535 all checks consistent
15.12.1976 31545 all checks consistent
16.12.1976 3636 all checks consistent
17.12.1976 ——— reading could not be verified
18.12.1976 2626 all checks consistent
19.12.1976 2323 all checks consistent
20.12.1976 ——— reading could not be verified
23.12.1976 1212 all checks consistent
25.12.1976 2626 all checks consistent
26.12.1976 ——— reading could not be verified
30.12.1976 ——— reading could not be verified

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.