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 1952 291 sheets · 270 usable · mean R 41.8

DrawingDategfRReading
01.01.1952 661121 all checks consistent
03.01.1952 61878 all checks consistent
08.01.1952 31141 all checks consistent
09.01.1952 52373 all checks consistent
10.01.1952 62282 all checks consistent
11.01.1952 42262 all checks consistent
13.01.1952 34878 all checks consistent
16.01.1952 644104 all checks consistent
17.01.1952 42565 all checks consistent
19.01.1952 31848 all checks consistent
21.01.1952 11020 all checks consistent
22.01.1952 1717 all checks consistent
24.01.1952 ——— reading could not be verified
26.01.1952 ——— reading could not be verified
27.01.1952 21232 all checks consistent
28.01.1952 11222 all checks consistent
31.01.1952 2424 all checks consistent
02.02.1952 1111 all checks consistent
04.02.1952 2222 all checks consistent
05.02.1952 31848 all checks consistent
06.02.1952 31848 all checks consistent
07.02.1952 21333 all checks consistent
09.02.1952 31444 all checks consistent
11.02.1952 000 all checks consistent
12.02.1952 1313 all checks consistent
13.02.1952 11727 all checks consistent
14.02.1952 22040 all checks consistent
16.02.1952 34474 all checks consistent
17.02.1952 44282 all checks consistent
18.02.1952 33969 all checks consistent
19.02.1952 24262 all checks consistent
20.02.1952 23353 all checks consistent
22.02.1952 3636 all checks consistent
24.02.1952 2222 all checks consistent
26.02.1952 000 all checks consistent
27.02.1952 000 all checks consistent
29.02.1952 000 all checks consistent
01.03.1952 000 all checks consistent
02.03.1952 000 all checks consistent
03.03.1952 000 all checks consistent
04.03.1952 000 all checks consistent
06.03.1952 1212 all checks consistent
08.03.1952 2323 all checks consistent
11.03.1952 3737 all checks consistent
12.03.1952 21030 all checks consistent
13.03.1952 21535 all checks consistent
17.03.1952 3636 all checks consistent
18.03.1952 ——— reading could not be verified
19.03.1952 1414 all checks consistent
21.03.1952 000 all checks consistent
22.03.1952 000 all checks consistent
23.03.1952 1111 all checks consistent
24.03.1952 000 all checks consistent
25.03.1952 3737 all checks consistent
26.03.1952 21636 all checks consistent
27.03.1952 32757 all checks consistent
28.03.1952 53989 all checks consistent
29.03.1952 54595 all checks consistent
31.03.1952 3939 all checks consistent
01.04.1952 ——— reading could not be verified
02.04.1952 11424 all checks consistent
03.04.1952 21131 all checks consistent
06.04.1952 12333 all checks consistent
07.04.1952 12333 all checks consistent
08.04.1952 22141 all checks consistent
09.04.1952 21131 all checks consistent
10.04.1952 21333 all checks consistent
11.04.1952 32151 all checks consistent
12.04.1952 12131 all checks consistent
13.04.1952 11323 all checks consistent
14.04.1952 1414 all checks consistent
15.04.1952 000 all checks consistent
16.04.1952 1212 all checks consistent
17.04.1952 1111 all checks consistent
18.04.1952 11020 all checks consistent
19.04.1952 21939 all checks consistent
20.04.1952 23555 all checks consistent
21.04.1952 53181 all checks consistent
22.04.1952 52575 all checks consistent
23.04.1952 41858 all checks consistent
24.04.1952 3838 all checks consistent
25.04.1952 2929 all checks consistent
26.04.1952 21232 all checks consistent
01.05.1952 2323 all checks consistent
02.05.1952 2222 all checks consistent
03.05.1952 1111 all checks consistent
04.05.1952 2828 all checks consistent
05.05.1952 31545 all checks consistent
06.05.1952 32252 all checks consistent
07.05.1952 2828 all checks consistent
08.05.1952 11020 all checks consistent
09.05.1952 1212 all checks consistent
10.05.1952 000 all checks consistent
11.05.1952 000 all checks consistent
12.05.1952 000 all checks consistent
13.05.1952 ——— reading could not be verified
14.05.1952 1313 all checks consistent
15.05.1952 1111 all checks consistent
16.05.1952 1212 all checks consistent
20.05.1952 32050 all checks consistent
21.05.1952 1919 all checks consistent
23.05.1952 2424 all checks consistent
25.05.1952 1212 all checks consistent
26.05.1952 1212 all checks consistent
27.05.1952 3838 all checks consistent
28.05.1952 42969 all checks consistent
29.05.1952 41858 all checks consistent
30.05.1952 21333 all checks consistent
31.05.1952 11020 all checks consistent
01.06.1952 1616 all checks consistent
02.06.1952 2323 all checks consistent
03.06.1952 2222 all checks consistent
04.06.1952 1111 all checks consistent
05.06.1952 000 all checks consistent
06.06.1952 ——— reading could not be verified
07.06.1952 31444 all checks consistent
08.06.1952 ——— reading could not be verified
09.06.1952 1111 all checks consistent
10.06.1952 2424 all checks consistent
11.06.1952 1212 all checks consistent
12.06.1952 1616 all checks consistent
13.06.1952 11121 all checks consistent
14.06.1952 21232 all checks consistent
15.06.1952 ——— reading could not be verified
16.06.1952 4949 all checks consistent
17.06.1952 41454 all checks consistent
18.06.1952 42060 all checks consistent
19.06.1952 51363 all checks consistent
20.06.1952 42767 all checks consistent
21.06.1952 51969 all checks consistent
22.06.1952 51262 all checks consistent
23.06.1952 51363 all checks consistent
24.06.1952 61676 all checks consistent
27.06.1952 52373 all checks consistent
28.06.1952 43777 all checks consistent
29.06.1952 32757 all checks consistent
30.06.1952 43474 all checks consistent
01.07.1952 42060 all checks consistent
02.07.1952 32353 all checks consistent
03.07.1952 21636 all checks consistent
04.07.1952 21535 all checks consistent
05.07.1952 21636 all checks consistent
06.07.1952 ——— reading could not be verified
07.07.1952 1313 all checks consistent
08.07.1952 3636 all checks consistent
09.07.1952 32454 all checks consistent
10.07.1952 32757 all checks consistent
11.07.1952 43474 all checks consistent
12.07.1952 35686 all checks consistent
13.07.1952 35080 all checks consistent
14.07.1952 773143 all checks consistent
15.07.1952 770140 all checks consistent
16.07.1952 35282 all checks consistent
17.07.1952 ——— reading could not be verified
18.07.1952 31646 all checks consistent
19.07.1952 2727 all checks consistent
20.07.1952 3434 all checks consistent
22.07.1952 1111 all checks consistent
23.07.1952 1111 all checks consistent
24.07.1952 ——— reading could not be verified
25.07.1952 3434 all checks consistent
26.07.1952 2424 all checks consistent
27.07.1952 2323 all checks consistent
28.07.1952 2424 all checks consistent
29.07.1952 2525 all checks consistent
30.07.1952 21535 all checks consistent
31.07.1952 32858 all checks consistent
01.08.1952 22646 all checks consistent
02.08.1952 32858 all checks consistent
03.08.1952 22747 all checks consistent
04.08.1952 31848 all checks consistent
05.08.1952 51060 all checks consistent
06.08.1952 4545 all checks consistent
07.08.1952 41757 all checks consistent
08.08.1952 51262 all checks consistent
09.08.1952 51666 all checks consistent
10.08.1952 51666 all checks consistent
11.08.1952 41454 all checks consistent
12.08.1952 41858 all checks consistent
13.08.1952 42565 all checks consistent
14.08.1952 33060 all checks consistent
15.08.1952 35181 all checks consistent
16.08.1952 43575 all checks consistent
17.08.1952 4949 all checks consistent
18.08.1952 41454 all checks consistent
19.08.1952 3333 all checks consistent
20.08.1952 2626 all checks consistent
21.08.1952 21636 all checks consistent
22.08.1952 22444 all checks consistent
23.08.1952 53585 all checks consistent
24.08.1952 45898 all checks consistent
25.08.1952 646106 all checks consistent
26.08.1952 550100 all checks consistent
27.08.1952 754124 all checks consistent
28.08.1952 655115 all checks consistent
29.08.1952 762132 all checks consistent
30.08.1952 556106 all checks consistent
31.08.1952 54292 all checks consistent
01.09.1952 574124 all checks consistent
02.09.1952 466106 all checks consistent
03.09.1952 43878 all checks consistent
04.09.1952 21636 all checks consistent
05.09.1952 ——— reading could not be verified
06.09.1952 41555 all checks consistent
07.09.1952 31040 all checks consistent
08.09.1952 1515 all checks consistent
09.09.1952 2929 all checks consistent
10.09.1952 2626 all checks consistent
11.09.1952 000 all checks consistent
12.09.1952 000 all checks consistent
13.09.1952 000 all checks consistent
14.09.1952 000 all checks consistent
15.09.1952 000 all checks consistent
16.09.1952 000 all checks consistent
17.09.1952 ——— reading could not be verified
18.09.1952 2929 all checks consistent
19.09.1952 31242 all checks consistent
20.09.1952 21030 all checks consistent
21.09.1952 5959 all checks consistent
22.09.1952 ——— reading could not be verified
24.09.1952 43171 all checks consistent
25.09.1952 31848 all checks consistent
26.09.1952 ——— reading could not be verified
27.09.1952 32050 all checks consistent
28.09.1952 31444 all checks consistent
29.09.1952 3939 all checks consistent
30.09.1952 2323 all checks consistent
01.10.1952 ——— reading could not be verified
02.10.1952 3636 all checks consistent
03.10.1952 2222 all checks consistent
04.10.1952 51262 all checks consistent
05.10.1952 31242 all checks consistent
06.10.1952 41858 all checks consistent
07.10.1952 2929 all checks consistent
08.10.1952 21737 all checks consistent
10.10.1952 ——— reading could not be verified
11.10.1952 1818 all checks consistent
12.10.1952 11424 all checks consistent
13.10.1952 1414 all checks consistent
14.10.1952 1313 all checks consistent
15.10.1952 1515 all checks consistent
16.10.1952 1515 all checks consistent
17.10.1952 000 all checks consistent
18.10.1952 000 all checks consistent
20.10.1952 ——— reading could not be verified
21.10.1952 ——— reading could not be verified
22.10.1952 13949 all checks consistent
23.10.1952 16272 all checks consistent
24.10.1952 ——— reading could not be verified
25.10.1952 14353 all checks consistent
26.10.1952 34777 all checks consistent
27.10.1952 33464 all checks consistent
28.10.1952 22242 all checks consistent
29.10.1952 24464 all checks consistent
30.10.1952 32151 all checks consistent
31.10.1952 11828 all checks consistent
04.11.1952 000 all checks consistent
05.11.1952 1313 all checks consistent
06.11.1952 1818 all checks consistent
07.11.1952 23353 all checks consistent
08.11.1952 22646 all checks consistent
12.11.1952 3333 all checks consistent
13.11.1952 2929 all checks consistent
15.11.1952 2424 all checks consistent
16.11.1952 1717 all checks consistent
17.11.1952 11222 all checks consistent
19.11.1952 15060 all checks consistent
20.11.1952 15161 all checks consistent
21.11.1952 13242 all checks consistent
23.11.1952 24767 all checks consistent
24.11.1952 22949 all checks consistent
25.11.1952 33464 all checks consistent
26.11.1952 21535 all checks consistent
28.11.1952 1212 all checks consistent
29.11.1952 000 all checks consistent
30.11.1952 ——— reading could not be verified
01.12.1952 1111 all checks consistent
02.12.1952 2323 all checks consistent
03.12.1952 1313 all checks consistent
11.12.1952 21434 all checks consistent
13.12.1952 42363 all checks consistent
14.12.1952 63090 all checks consistent
15.12.1952 53585 all checks consistent
16.12.1952 54494 all checks consistent
17.12.1952 44484 all checks consistent
18.12.1952 556106 all checks consistent
19.12.1952 34373 all checks consistent
28.12.1952 000 all checks consistent
29.12.1952 000 all checks consistent
30.12.1952 1313 all checks consistent
31.12.1952 31545 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.