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 1964 274 sheets · 246 usable · mean R 9.6

DrawingDategfRReading
01.01.1964 ——— reading could not be verified
02.01.1964 000 all checks consistent
03.01.1964 1212 all checks consistent
06.01.1964 2626 all checks consistent
11.01.1964 2323 all checks consistent
13.01.1964 3838 all checks consistent
14.01.1964 2424 all checks consistent
17.01.1964 000 all checks consistent
19.01.1964 1111 all checks consistent
20.01.1964 ——— reading could not be verified
24.01.1964 2323 all checks consistent
25.01.1964 1313 all checks consistent
26.01.1964 1111 all checks consistent
27.01.1964 1111 all checks consistent
28.01.1964 2323 all checks consistent
29.01.1964 2525 all checks consistent
06.02.1964 000 all checks consistent
08.02.1964 1414 all checks consistent
09.02.1964 ——— reading could not be verified
11.02.1964 000 all checks consistent
12.02.1964 000 all checks consistent
13.02.1964 000 all checks consistent
18.02.1964 1111 all checks consistent
25.02.1964 22646 all checks consistent
26.02.1964 13545 all checks consistent
03.03.1964 1111 all checks consistent
12.03.1964 2828 all checks consistent
14.03.1964 ——— reading could not be verified
16.03.1964 2727 all checks consistent
21.03.1964 2525 all checks consistent
22.03.1964 ——— reading could not be verified
23.03.1964 21030 all checks consistent
26.03.1964 2323 all checks consistent
27.03.1964 1111 all checks consistent
28.03.1964 1818 all checks consistent
29.03.1964 ——— reading could not be verified
30.03.1964 000 all checks consistent
31.03.1964 ——— reading could not be verified
01.04.1964 1111 all checks consistent
02.04.1964 ——— reading could not be verified
03.04.1964 1111 all checks consistent
05.04.1964 1313 all checks consistent
07.04.1964 1111 all checks consistent
08.04.1964 2222 all checks consistent
09.04.1964 1111 all checks consistent
10.04.1964 1111 all checks consistent
11.04.1964 000 all checks consistent
12.04.1964 000 all checks consistent
13.04.1964 1111 all checks consistent
14.04.1964 1111 all checks consistent
15.04.1964 000 all checks consistent
16.04.1964 000 all checks consistent
17.04.1964 000 all checks consistent
18.04.1964 000 all checks consistent
19.04.1964 000 all checks consistent
20.04.1964 1414 all checks consistent
21.04.1964 1919 all checks consistent
22.04.1964 1717 all checks consistent
23.04.1964 2727 all checks consistent
24.04.1964 21030 all checks consistent
25.04.1964 1313 all checks consistent
29.04.1964 000 all checks consistent
30.04.1964 1212 all checks consistent
01.05.1964 000 all checks consistent
02.05.1964 000 all checks consistent
03.05.1964 000 all checks consistent
04.05.1964 1313 all checks consistent
05.05.1964 1515 all checks consistent
06.05.1964 1212 all checks consistent
07.05.1964 1212 all checks consistent
08.05.1964 1313 all checks consistent
09.05.1964 1111 all checks consistent
11.05.1964 000 all checks consistent
12.05.1964 000 all checks consistent
14.05.1964 1313 all checks consistent
15.05.1964 1616 all checks consistent
18.05.1964 ——— reading could not be verified
19.05.1964 1515 all checks consistent
21.05.1964 000 all checks consistent
22.05.1964 000 all checks consistent
23.05.1964 1414 all checks consistent
24.05.1964 1111 all checks consistent
25.05.1964 1616 all checks consistent
26.05.1964 1111 all checks consistent
27.05.1964 1111 all checks consistent
28.05.1964 1111 all checks consistent
29.05.1964 1111 all checks consistent
30.05.1964 1111 all checks consistent
31.05.1964 ——— reading could not be verified
01.06.1964 1111 all checks consistent
02.06.1964 1111 all checks consistent
03.06.1964 1111 all checks consistent
04.06.1964 1212 all checks consistent
05.06.1964 000 all checks consistent
06.06.1964 000 all checks consistent
07.06.1964 000 all checks consistent
08.06.1964 000 all checks consistent
09.06.1964 1111 all checks consistent
10.06.1964 ——— reading could not be verified
11.06.1964 1111 all checks consistent
12.06.1964 2323 all checks consistent
14.06.1964 1616 all checks consistent
15.06.1964 31646 all checks consistent
16.06.1964 21030 all checks consistent
17.06.1964 1818 all checks consistent
18.06.1964 ——— reading could not be verified
19.06.1964 21939 all checks consistent
20.06.1964 1818 all checks consistent
21.06.1964 1515 all checks consistent
22.06.1964 ——— reading could not be verified
23.06.1964 000 all checks consistent
24.06.1964 000 all checks consistent
25.06.1964 000 all checks consistent
26.06.1964 000 all checks consistent
27.06.1964 000 all checks consistent
28.06.1964 000 all checks consistent
29.06.1964 ——— reading could not be verified
30.06.1964 ——— reading could not be verified
01.07.1964 ——— reading could not be verified
02.07.1964 000 all checks consistent
03.07.1964 000 all checks consistent
04.07.1964 ——— reading could not be verified
05.07.1964 ——— reading could not be verified
06.07.1964 1212 all checks consistent
07.07.1964 000 all checks consistent
08.07.1964 000 all checks consistent
09.07.1964 000 all checks consistent
10.07.1964 000 all checks consistent
13.07.1964 000 all checks consistent
14.07.1964 1313 all checks consistent
15.07.1964 1313 all checks consistent
16.07.1964 1414 all checks consistent
17.07.1964 ——— reading could not be verified
18.07.1964 1111 all checks consistent
19.07.1964 000 all checks consistent
20.07.1964 1111 all checks consistent
21.07.1964 000 all checks consistent
22.07.1964 000 all checks consistent
23.07.1964 000 all checks consistent
24.07.1964 000 all checks consistent
25.07.1964 000 all checks consistent
26.07.1964 000 all checks consistent
27.07.1964 000 all checks consistent
28.07.1964 000 all checks consistent
29.07.1964 000 all checks consistent
30.07.1964 000 all checks consistent
31.07.1964 000 all checks consistent
01.08.1964 1515 all checks consistent
02.08.1964 2727 all checks consistent
03.08.1964 1313 all checks consistent
04.08.1964 1212 all checks consistent
05.08.1964 000 all checks consistent
06.08.1964 000 all checks consistent
07.08.1964 ——— reading could not be verified
08.08.1964 000 all checks consistent
09.08.1964 000 all checks consistent
10.08.1964 000 all checks consistent
11.08.1964 1111 all checks consistent
12.08.1964 2929 all checks consistent
13.08.1964 ——— reading could not be verified
14.08.1964 23151 all checks consistent
15.08.1964 ——— reading could not be verified
16.08.1964 21131 all checks consistent
17.08.1964 1616 all checks consistent
18.08.1964 1111 all checks consistent
19.08.1964 ——— reading could not be verified
20.08.1964 ——— reading could not be verified
21.08.1964 1111 all checks consistent
22.08.1964 000 all checks consistent
23.08.1964 000 all checks consistent
24.08.1964 000 all checks consistent
25.08.1964 000 all checks consistent
26.08.1964 000 all checks consistent
27.08.1964 000 all checks consistent
28.08.1964 000 all checks consistent
29.08.1964 000 all checks consistent
30.08.1964 000 all checks consistent
31.08.1964 000 all checks consistent
01.09.1964 1111 all checks consistent
02.09.1964 1111 all checks consistent
03.09.1964 ——— reading could not be verified
04.09.1964 000 all checks consistent
05.09.1964 000 all checks consistent
06.09.1964 000 all checks consistent
07.09.1964 1111 all checks consistent
08.09.1964 21232 all checks consistent
09.09.1964 1212 all checks consistent
10.09.1964 1414 all checks consistent
11.09.1964 1313 all checks consistent
12.09.1964 1616 all checks consistent
13.09.1964 1616 all checks consistent
14.09.1964 1616 all checks consistent
15.09.1964 ——— reading could not be verified
16.09.1964 000 all checks consistent
17.09.1964 000 all checks consistent
18.09.1964 000 all checks consistent
19.09.1964 000 all checks consistent
20.09.1964 000 all checks consistent
21.09.1964 000 all checks consistent
22.09.1964 000 all checks consistent
25.09.1964 000 all checks consistent
27.09.1964 000 all checks consistent
28.09.1964 000 all checks consistent
29.09.1964 000 all checks consistent
30.09.1964 000 all checks consistent
01.10.1964 1313 all checks consistent
02.10.1964 1313 all checks consistent
03.10.1964 000 all checks consistent
04.10.1964 000 all checks consistent
05.10.1964 000 all checks consistent
06.10.1964 1717 all checks consistent
07.10.1964 11121 all checks consistent
08.10.1964 1919 all checks consistent
09.10.1964 1515 all checks consistent
10.10.1964 000 all checks consistent
11.10.1964 000 all checks consistent
12.10.1964 000 all checks consistent
13.10.1964 000 all checks consistent
14.10.1964 000 all checks consistent
15.10.1964 000 all checks consistent
16.10.1964 000 all checks consistent
17.10.1964 000 all checks consistent
18.10.1964 ——— reading could not be verified
19.10.1964 11222 all checks consistent
20.10.1964 1414 all checks consistent
21.10.1964 000 all checks consistent
22.10.1964 000 all checks consistent
23.10.1964 000 all checks consistent
24.10.1964 000 all checks consistent
25.10.1964 1111 all checks consistent
26.10.1964 1111 all checks consistent
27.10.1964 1313 all checks consistent
28.10.1964 000 all checks consistent
29.10.1964 000 all checks consistent
30.10.1964 2424 all checks consistent
31.10.1964 1313 all checks consistent
01.11.1964 1313 all checks consistent
02.11.1964 1111 all checks consistent
03.11.1964 1111 all checks consistent
04.11.1964 000 all checks consistent
05.11.1964 ——— reading could not be verified
07.11.1964 000 all checks consistent
08.11.1964 000 all checks consistent
09.11.1964 000 all checks consistent
10.11.1964 000 all checks consistent
12.11.1964 000 all checks consistent
13.11.1964 000 all checks consistent
14.11.1964 000 all checks consistent
16.11.1964 2727 all checks consistent
17.11.1964 1919 all checks consistent
18.11.1964 2525 all checks consistent
20.11.1964 2323 all checks consistent
21.11.1964 2323 all checks consistent
23.11.1964 000 all checks consistent
25.11.1964 000 all checks consistent
26.11.1964 000 all checks consistent
27.11.1964 000 all checks consistent
28.11.1964 000 all checks consistent
30.11.1964 000 all checks consistent
01.12.1964 000 all checks consistent
02.12.1964 000 all checks consistent
03.12.1964 000 all checks consistent
05.12.1964 1111 all checks consistent
14.12.1964 1212 all checks consistent
15.12.1964 1313 all checks consistent
16.12.1964 2626 all checks consistent
17.12.1964 2626 all checks consistent
18.12.1964 3838 all checks consistent
19.12.1964 3939 all checks consistent
24.12.1964 1414 all checks consistent
25.12.1964 1313 all checks consistent
29.12.1964 41252 all checks consistent
30.12.1964 2929 all checks consistent
31.12.1964 11020 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.