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 1994 283 sheets · 257 usable · mean R 40.9

DrawingDategfRReading
04.01.1994 5144194 all checks consistent
05.01.1994 ——— reading could not be verified
07.01.1994 669129 all checks consistent
08.01.1994 664124 all checks consistent
09.01.1994 ——— reading could not be verified
10.01.1994 34878 all checks consistent
11.01.1994 23757 all checks consistent
16.01.1994 41151 all checks consistent
18.01.1994 21232 all checks consistent
23.01.1994 ——— reading could not be verified
24.01.1994 52272 all checks consistent
25.01.1994 42565 counts consistent, some coordinates doubtful
26.01.1994 ——— reading could not be verified
31.01.1994 2828 all checks consistent
01.02.1994 31141 all checks consistent
03.02.1994 41555 all checks consistent
04.02.1994 42565 all checks consistent
05.02.1994 33060 all checks consistent
07.02.1994 41656 all checks consistent
09.02.1994 42363 all checks consistent
16.02.1994 ——— reading could not be verified
17.02.1994 41656 all checks consistent
18.02.1994 2929 all checks consistent
19.02.1994 21030 all checks consistent
20.02.1994 1717 all checks consistent
22.02.1994 41757 all checks consistent
23.02.1994 41858 all checks consistent
24.02.1994 41959 all checks consistent
28.02.1994 42666 all checks consistent
01.03.1994 43777 all checks consistent
02.03.1994 ——— reading could not be verified
03.03.1994 54393 counts consistent, some coordinates doubtful
04.03.1994 44282 all checks consistent
05.03.1994 ——— reading could not be verified
07.03.1994 43575 all checks consistent
08.03.1994 43575 all checks consistent
09.03.1994 31646 counts consistent, some coordinates doubtful
10.03.1994 21131 all checks consistent
11.03.1994 3939 all checks consistent
12.03.1994 42060 counts consistent, some coordinates doubtful
14.03.1994 11525 all checks consistent
15.03.1994 32151 all checks consistent
16.03.1994 21131 all checks consistent
19.03.1994 1111 all checks consistent
20.03.1994 1111 all checks consistent
21.03.1994 2323 all checks consistent
22.03.1994 21636 all checks consistent
23.03.1994 2727 all checks consistent
24.03.1994 41050 all checks consistent
25.03.1994 51363 all checks consistent
26.03.1994 41050 all checks consistent
27.03.1994 2626 all checks consistent
30.03.1994 41757 all checks consistent
31.03.1994 21333 counts consistent, some coordinates doubtful
01.04.1994 2626 all checks consistent
02.04.1994 000 all checks consistent
03.04.1994 000 all checks consistent
04.04.1994 000 all checks consistent
05.04.1994 1111 all checks consistent
06.04.1994 ——— reading could not be verified
07.04.1994 000 all checks consistent
08.04.1994 ——— reading could not be verified
09.04.1994 1111 all checks consistent
10.04.1994 1212 all checks consistent
11.04.1994 3535 all checks consistent
12.04.1994 2626 all checks consistent
13.04.1994 21434 all checks consistent
14.04.1994 2828 all checks consistent
15.04.1994 1111 all checks consistent
16.04.1994 1313 all checks consistent
18.04.1994 ——— reading could not be verified
19.04.1994 3434 all checks consistent
21.04.1994 31040 counts consistent, some coordinates doubtful
24.04.1994 41050 all checks consistent
25.04.1994 3636 all checks consistent
26.04.1994 41656 all checks consistent
27.04.1994 41050 all checks consistent
28.04.1994 2424 all checks consistent
29.04.1994 1313 all checks consistent
30.04.1994 2424 all checks consistent
02.05.1994 31242 all checks consistent
03.05.1994 31242 all checks consistent
04.05.1994 2323 all checks consistent
05.05.1994 1212 all checks consistent
06.05.1994 1717 all checks consistent
07.05.1994 ——— reading could not be verified
09.05.1994 1818 all checks consistent
10.05.1994 1313 all checks consistent
12.05.1994 3939 all checks consistent
13.05.1994 31343 all checks consistent
14.05.1994 31646 all checks consistent
15.05.1994 31141 all checks consistent
16.05.1994 32252 all checks consistent
17.05.1994 52171 all checks consistent
18.05.1994 21737 all checks consistent
19.05.1994 22444 all checks consistent
20.05.1994 ——— reading could not be verified
21.05.1994 21737 all checks consistent
23.05.1994 2828 all checks consistent
24.05.1994 1212 all checks consistent
25.05.1994 000 all checks consistent
26.05.1994 000 all checks consistent
27.05.1994 000 all checks consistent
28.05.1994 000 all checks consistent
29.05.1994 000 all checks consistent
30.05.1994 000 all checks consistent
31.05.1994 000 all checks consistent
01.06.1994 000 all checks consistent
02.06.1994 000 all checks consistent
03.06.1994 000 all checks consistent
04.06.1994 000 all checks consistent
05.06.1994 000 all checks consistent
06.06.1994 000 all checks consistent
07.06.1994 1515 all checks consistent
09.06.1994 41959 all checks consistent
10.06.1994 42767 all checks consistent
11.06.1994 53989 all checks consistent
12.06.1994 52474 all checks consistent
13.06.1994 72292 counts consistent, some coordinates doubtful
14.06.1994 53686 all checks consistent
16.06.1994 53888 all checks consistent
17.06.1994 51868 all checks consistent
18.06.1994 41454 all checks consistent
19.06.1994 3636 all checks consistent
20.06.1994 3636 all checks consistent
21.06.1994 1212 all checks consistent
22.06.1994 1818 all checks consistent
23.06.1994 21131 all checks consistent
24.06.1994 31747 all checks consistent
25.06.1994 1515 all checks consistent
26.06.1994 000 all checks consistent
27.06.1994 2222 all checks consistent
28.06.1994 ——— reading could not be verified
29.06.1994 11424 all checks consistent
30.06.1994 11121 all checks consistent
01.07.1994 12838 all checks consistent
02.07.1994 33868 all checks consistent
03.07.1994 32353 all checks consistent
04.07.1994 31646 all checks consistent
05.07.1994 21939 all checks consistent
06.07.1994 21737 all checks consistent
07.07.1994 63393 all checks consistent
08.07.1994 43676 all checks consistent
09.07.1994 33969 all checks consistent
10.07.1994 34272 all checks consistent
11.07.1994 53080 all checks consistent
12.07.1994 72494 all checks consistent
13.07.1994 62484 all checks consistent
14.07.1994 51060 all checks consistent
15.07.1994 ——— reading could not be verified
16.07.1994 52474 all checks consistent
17.07.1994 53282 all checks consistent
18.07.1994 61777 all checks consistent
19.07.1994 21030 all checks consistent
20.07.1994 ——— reading could not be verified
21.07.1994 3838 all checks consistent
22.07.1994 2323 all checks consistent
23.07.1994 2727 counts consistent, some coordinates doubtful
24.07.1994 1818 all checks consistent
25.07.1994 1616 all checks consistent
26.07.1994 2222 all checks consistent
27.07.1994 4545 all checks consistent
28.07.1994 2626 all checks consistent
29.07.1994 000 all checks consistent
30.07.1994 1212 all checks consistent
01.08.1994 2222 all checks consistent
02.08.1994 2424 all checks consistent
03.08.1994 11020 all checks consistent
04.08.1994 11121 all checks consistent
05.08.1994 21535 all checks consistent
06.08.1994 12232 all checks consistent
07.08.1994 1717 all checks consistent
08.08.1994 ——— reading could not be verified
09.08.1994 1717 all checks consistent
10.08.1994 ——— reading could not be verified
11.08.1994 21030 all checks consistent
12.08.1994 31848 all checks consistent
13.08.1994 32454 all checks consistent
14.08.1994 42767 counts consistent, some coordinates doubtful
15.08.1994 33666 all checks consistent
16.08.1994 41858 counts consistent, some coordinates doubtful
17.08.1994 31646 all checks consistent
18.08.1994 41353 all checks consistent
19.08.1994 42767 all checks consistent
20.08.1994 41353 all checks consistent
21.08.1994 21030 counts consistent, some coordinates doubtful
22.08.1994 2424 all checks consistent
23.08.1994 31343 all checks consistent
24.08.1994 2828 all checks consistent
25.08.1994 1414 all checks consistent
26.08.1994 1717 all checks consistent
27.08.1994 2222 counts consistent, some coordinates doubtful
29.08.1994 1111 all checks consistent
30.08.1994 3838 all checks consistent
31.08.1994 32555 all checks consistent
01.09.1994 33565 all checks consistent
02.09.1994 43878 all checks consistent
03.09.1994 640100 counts consistent, some coordinates doubtful
04.09.1994 43070 all checks consistent
05.09.1994 641101 all checks consistent
06.09.1994 53686 all checks consistent
07.09.1994 42666 all checks consistent
08.09.1994 ——— reading could not be verified
09.09.1994 ——— reading could not be verified
10.09.1994 41252 counts consistent, some coordinates doubtful
11.09.1994 2222 all checks consistent
12.09.1994 2222 all checks consistent
13.09.1994 2323 all checks consistent
14.09.1994 1111 all checks consistent
15.09.1994 1111 all checks consistent
16.09.1994 1111 all checks consistent
17.09.1994 1616 all checks consistent
18.09.1994 21131 all checks consistent
19.09.1994 1313 all checks consistent
20.09.1994 ——— reading could not be verified
21.09.1994 ——— reading could not be verified
22.09.1994 2626 all checks consistent
23.09.1994 2727 all checks consistent
24.09.1994 11121 all checks consistent
25.09.1994 11525 all checks consistent
26.09.1994 32050 counts consistent, some coordinates doubtful
27.09.1994 31141 all checks consistent
28.09.1994 4747 counts consistent, some coordinates doubtful
29.09.1994 1111 all checks consistent
30.09.1994 ——— reading could not be verified
01.10.1994 ——— reading could not be verified
02.10.1994 2222 all checks consistent
03.10.1994 2323 all checks consistent
04.10.1994 3838 all checks consistent
05.10.1994 52070 all checks consistent
06.10.1994 52878 all checks consistent
07.10.1994 41959 all checks consistent
08.10.1994 42060 all checks consistent
09.10.1994 ——— reading could not be verified
11.10.1994 41454 all checks consistent
14.10.1994 44282 all checks consistent
15.10.1994 45393 counts consistent, some coordinates doubtful
16.10.1994 34676 all checks consistent
17.10.1994 33868 all checks consistent
19.10.1994 ——— reading could not be verified
20.10.1994 52979 all checks consistent
24.10.1994 21939 all checks consistent
26.10.1994 ——— reading could not be verified
27.10.1994 53989 all checks consistent
28.10.1994 54090 all checks consistent
29.10.1994 45090 all checks consistent
30.10.1994 54494 counts consistent, some coordinates doubtful
31.10.1994 32656 all checks consistent
01.11.1994 44282 all checks consistent
02.11.1994 54696 all checks consistent
03.11.1994 42161 all checks consistent
04.11.1994 31848 all checks consistent
06.11.1994 4747 all checks consistent
07.11.1994 2323 all checks consistent
08.11.1994 2222 all checks consistent
09.11.1994 3434 all checks consistent
10.11.1994 3434 all checks consistent
16.11.1994 1313 all checks consistent
23.11.1994 1313 all checks consistent
25.11.1994 11222 all checks consistent
26.11.1994 11121 all checks consistent
27.11.1994 12333 all checks consistent
28.11.1994 22040 all checks consistent
29.11.1994 1717 all checks consistent
01.12.1994 1212 all checks consistent
02.12.1994 1111 all checks consistent
05.12.1994 1414 all checks consistent
06.12.1994 1717 all checks consistent
07.12.1994 2929 all checks consistent
10.12.1994 32858 all checks consistent
13.12.1994 24161 all checks consistent
14.12.1994 14252 all checks consistent
16.12.1994 12030 all checks consistent
17.12.1994 1313 all checks consistent
19.12.1994 2929 all checks consistent
21.12.1994 1818 all checks consistent
22.12.1994 31343 all checks consistent
23.12.1994 1919 all checks consistent
24.12.1994 1919 all checks consistent
25.12.1994 21535 all checks consistent
29.12.1994 1818 all checks consistent
30.12.1994 000 all checks consistent
31.12.1994 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.