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 1953 303 sheets · 287 usable · mean R 16.6

DrawingDategfRReading
02.01.1953 11121 all checks consistent
03.01.1953 1616 all checks consistent
04.01.1953 21737 all checks consistent
05.01.1953 22141 all checks consistent
07.01.1953 32151 all checks consistent
08.01.1953 32353 all checks consistent
12.01.1953 43272 all checks consistent
14.01.1953 42161 all checks consistent
23.01.1953 1313 all checks consistent
24.01.1953 1212 all checks consistent
25.01.1953 1212 all checks consistent
26.01.1953 000 all checks consistent
30.01.1953 000 all checks consistent
31.01.1953 000 all checks consistent
01.02.1953 000 all checks consistent
03.02.1953 1111 all checks consistent
05.02.1953 1111 all checks consistent
06.02.1953 1111 all checks consistent
07.02.1953 1111 all checks consistent
10.02.1953 3434 all checks consistent
11.02.1953 2323 all checks consistent
12.02.1953 000 all checks consistent
14.02.1953 000 all checks consistent
15.02.1953 000 all checks consistent
16.02.1953 000 all checks consistent
19.02.1953 000 all checks consistent
20.02.1953 000 all checks consistent
21.02.1953 000 all checks consistent
22.02.1953 000 all checks consistent
23.02.1953 000 all checks consistent
24.02.1953 000 all checks consistent
25.02.1953 000 all checks consistent
26.02.1953 000 all checks consistent
27.02.1953 000 all checks consistent
02.03.1953 000 all checks consistent
03.03.1953 000 all checks consistent
04.03.1953 000 all checks consistent
05.03.1953 1313 all checks consistent
06.03.1953 000 all checks consistent
07.03.1953 000 all checks consistent
08.03.1953 000 all checks consistent
09.03.1953 000 all checks consistent
10.03.1953 000 all checks consistent
12.03.1953 000 all checks consistent
13.03.1953 1111 all checks consistent
17.03.1953 000 all checks consistent
20.03.1953 2424 all checks consistent
21.03.1953 1313 all checks consistent
22.03.1953 2525 all checks consistent
23.03.1953 1313 all checks consistent
24.03.1953 1313 all checks consistent
25.03.1953 1212 all checks consistent
26.03.1953 000 all checks consistent
27.03.1953 2525 all checks consistent
28.03.1953 31040 all checks consistent
29.03.1953 2424 all checks consistent
30.03.1953 52272 all checks consistent
01.04.1953 41252 all checks consistent
02.04.1953 42060 all checks consistent
04.04.1953 21535 all checks consistent
05.04.1953 32757 all checks consistent
06.04.1953 32151 all checks consistent
07.04.1953 41858 all checks consistent
08.04.1953 41959 all checks consistent
09.04.1953 ——— reading could not be verified
10.04.1953 1616 all checks consistent
11.04.1953 1313 all checks consistent
14.04.1953 000 all checks consistent
15.04.1953 000 all checks consistent
16.04.1953 000 all checks consistent
17.04.1953 000 all checks consistent
19.04.1953 000 all checks consistent
20.04.1953 000 all checks consistent
21.04.1953 000 all checks consistent
22.04.1953 1111 all checks consistent
23.04.1953 1919 all checks consistent
24.04.1953 21838 all checks consistent
25.04.1953 32959 all checks consistent
26.04.1953 43878 all checks consistent
27.04.1953 45191 all checks consistent
28.04.1953 24767 all checks consistent
29.04.1953 25373 all checks consistent
30.04.1953 ——— reading could not be verified
02.05.1953 23353 all checks consistent
03.05.1953 31141 all checks consistent
04.05.1953 2323 all checks consistent
05.05.1953 1111 all checks consistent
07.05.1953 1111 all checks consistent
08.05.1953 000 all checks consistent
09.05.1953 000 all checks consistent
10.05.1953 000 all checks consistent
11.05.1953 000 all checks consistent
12.05.1953 000 all checks consistent
13.05.1953 000 all checks consistent
14.05.1953 000 all checks consistent
15.05.1953 000 all checks consistent
16.05.1953 000 all checks consistent
17.05.1953 1212 all checks consistent
19.05.1953 1212 all checks consistent
20.05.1953 1212 all checks consistent
23.05.1953 1212 all checks consistent
26.05.1953 ——— reading could not be verified
27.05.1953 1212 all checks consistent
28.05.1953 2727 all checks consistent
29.05.1953 3737 all checks consistent
30.05.1953 2525 all checks consistent
31.05.1953 1212 all checks consistent
01.06.1953 000 all checks consistent
02.06.1953 21636 all checks consistent
03.06.1953 11020 all checks consistent
04.06.1953 22646 all checks consistent
05.06.1953 21535 all checks consistent
06.06.1953 21232 all checks consistent
07.06.1953 22242 all checks consistent
08.06.1953 ——— reading could not be verified
09.06.1953 21434 all checks consistent
10.06.1953 21232 all checks consistent
11.06.1953 2626 all checks consistent
12.06.1953 1111 all checks consistent
13.06.1953 000 all checks consistent
14.06.1953 1717 all checks consistent
15.06.1953 1919 all checks consistent
16.06.1953 21434 all checks consistent
17.06.1953 21636 all checks consistent
18.06.1953 11020 all checks consistent
19.06.1953 31242 all checks consistent
20.06.1953 21232 all checks consistent
21.06.1953 3939 all checks consistent
22.06.1953 1919 all checks consistent
23.06.1953 1313 all checks consistent
24.06.1953 2727 all checks consistent
25.06.1953 1818 all checks consistent
26.06.1953 31040 all checks consistent
27.06.1953 1111 all checks consistent
28.06.1953 1111 all checks consistent
29.06.1953 1111 all checks consistent
30.06.1953 1111 all checks consistent
01.07.1953 000 all checks consistent
02.07.1953 1111 all checks consistent
03.07.1953 000 all checks consistent
04.07.1953 000 all checks consistent
05.07.1953 000 all checks consistent
06.07.1953 1111 all checks consistent
07.07.1953 000 all checks consistent
08.07.1953 000 all checks consistent
09.07.1953 3333 all checks consistent
10.07.1953 1414 all checks consistent
11.07.1953 1414 all checks consistent
12.07.1953 1919 all checks consistent
13.07.1953 21333 all checks consistent
14.07.1953 21434 all checks consistent
15.07.1953 11323 all checks consistent
16.07.1953 1919 all checks consistent
17.07.1953 1818 all checks consistent
18.07.1953 2727 all checks consistent
19.07.1953 2828 all checks consistent
20.07.1953 1111 all checks consistent
21.07.1953 1111 all checks consistent
22.07.1953 000 all checks consistent
23.07.1953 000 all checks consistent
24.07.1953 000 all checks consistent
25.07.1953 000 all checks consistent
26.07.1953 000 all checks consistent
27.07.1953 000 all checks consistent
28.07.1953 000 all checks consistent
29.07.1953 000 all checks consistent
30.07.1953 000 all checks consistent
31.07.1953 000 all checks consistent
01.08.1953 000 all checks consistent
02.08.1953 1111 all checks consistent
03.08.1953 1717 all checks consistent
04.08.1953 1717 all checks consistent
05.08.1953 1616 all checks consistent
06.08.1953 1515 all checks consistent
07.08.1953 2323 all checks consistent
08.08.1953 2525 all checks consistent
09.08.1953 ——— reading could not be verified
10.08.1953 42969 all checks consistent
11.08.1953 63393 all checks consistent
12.08.1953 62888 all checks consistent
13.08.1953 ——— reading could not be verified
14.08.1953 54292 all checks consistent
15.08.1953 44181 all checks consistent
16.08.1953 44585 all checks consistent
17.08.1953 31747 all checks consistent
18.08.1953 4646 all checks consistent
19.08.1953 3333 all checks consistent
20.08.1953 3434 all checks consistent
21.08.1953 2222 all checks consistent
22.08.1953 1111 all checks consistent
23.08.1953 1111 all checks consistent
25.08.1953 000 all checks consistent
26.08.1953 000 all checks consistent
27.08.1953 000 all checks consistent
28.08.1953 000 all checks consistent
29.08.1953 000 all checks consistent
30.08.1953 000 all checks consistent
31.08.1953 000 all checks consistent
01.09.1953 000 all checks consistent
02.09.1953 000 all checks consistent
03.09.1953 1313 all checks consistent
04.09.1953 000 all checks consistent
05.09.1953 2424 all checks consistent
06.09.1953 1313 all checks consistent
07.09.1953 ——— reading could not be verified
08.09.1953 2424 all checks consistent
09.09.1953 2424 all checks consistent
10.09.1953 2828 all checks consistent
11.09.1953 2929 all checks consistent
12.09.1953 21838 all checks consistent
13.09.1953 ——— reading could not be verified
14.09.1953 ——— reading could not be verified
15.09.1953 41555 all checks consistent
16.09.1953 ——— reading could not be verified
17.09.1953 41757 all checks consistent
18.09.1953 41959 all checks consistent
19.09.1953 3939 all checks consistent
20.09.1953 2727 all checks consistent
21.09.1953 ——— reading could not be verified
22.09.1953 ——— reading could not be verified
23.09.1953 1616 all checks consistent
24.09.1953 2323 all checks consistent
25.09.1953 2323 all checks consistent
26.09.1953 3737 all checks consistent
27.09.1953 000 all checks consistent
28.09.1953 1313 all checks consistent
29.09.1953 000 all checks consistent
30.09.1953 1313 all checks consistent
01.10.1953 2323 all checks consistent
02.10.1953 000 all checks consistent
03.10.1953 000 all checks consistent
04.10.1953 2323 all checks consistent
05.10.1953 ——— reading could not be verified
07.10.1953 ——— reading could not be verified
08.10.1953 1818 all checks consistent
09.10.1953 11020 all checks consistent
10.10.1953 1111 all checks consistent
11.10.1953 1313 all checks consistent
12.10.1953 1515 all checks consistent
14.10.1953 12434 all checks consistent
15.10.1953 12434 all checks consistent
16.10.1953 11525 all checks consistent
17.10.1953 ——— reading could not be verified
18.10.1953 000 all checks consistent
19.10.1953 000 all checks consistent
20.10.1953 000 all checks consistent
22.10.1953 000 all checks consistent
23.10.1953 000 all checks consistent
24.10.1953 1111 all checks consistent
25.10.1953 000 all checks consistent
26.10.1953 1616 all checks consistent
27.10.1953 1414 all checks consistent
28.10.1953 1313 all checks consistent
29.10.1953 000 all checks consistent
30.10.1953 000 all checks consistent
31.10.1953 1212 all checks consistent
01.11.1953 1616 all checks consistent
02.11.1953 1919 all checks consistent
03.11.1953 1616 all checks consistent
04.11.1953 1515 all checks consistent
05.11.1953 000 all checks consistent
09.11.1953 000 all checks consistent
10.11.1953 000 all checks consistent
13.11.1953 000 all checks consistent
14.11.1953 000 all checks consistent
15.11.1953 000 all checks consistent
16.11.1953 000 all checks consistent
17.11.1953 000 all checks consistent
20.11.1953 1111 all checks consistent
21.11.1953 000 all checks consistent
22.11.1953 000 all checks consistent
23.11.1953 000 all checks consistent
24.11.1953 000 all checks consistent
25.11.1953 000 all checks consistent
26.11.1953 000 all checks consistent
28.11.1953 000 all checks consistent
29.11.1953 000 all checks consistent
30.11.1953 000 all checks consistent
01.12.1953 000 all checks consistent
02.12.1953 000 all checks consistent
03.12.1953 000 all checks consistent
04.12.1953 000 all checks consistent
05.12.1953 000 all checks consistent
07.12.1953 1515 all checks consistent
08.12.1953 000 all checks consistent
09.12.1953 000 all checks consistent
10.12.1953 000 all checks consistent
11.12.1953 000 all checks consistent
12.12.1953 000 all checks consistent
13.12.1953 000 all checks consistent
14.12.1953 000 all checks consistent
16.12.1953 000 all checks consistent
18.12.1953 000 all checks consistent
19.12.1953 000 all checks consistent
20.12.1953 000 all checks consistent
21.12.1953 1313 all checks consistent
22.12.1953 000 all checks consistent
25.12.1953 000 all checks consistent
26.12.1953 1111 all checks consistent
27.12.1953 1313 all checks consistent
28.12.1953 ——— reading could not be verified
29.12.1953 1717 all checks consistent
30.12.1953 000 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.