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 1974 292 sheets · 279 usable · mean R 44.5

DrawingDategfRReading
01.01.1974 2323 all checks consistent
02.01.1974 11020 all checks consistent
03.01.1974 1717 all checks consistent
08.01.1974 2929 all checks consistent
10.01.1974 42060 all checks consistent
11.01.1974 41858 all checks consistent
14.01.1974 72494 counts consistent, some coordinates doubtful
15.01.1974 732102 all checks consistent
17.01.1974 62080 counts consistent, some coordinates doubtful
20.01.1974 4747 all checks consistent
21.01.1974 31242 all checks consistent
22.01.1974 42262 all checks consistent
23.01.1974 21636 all checks consistent
24.01.1974 2424 all checks consistent
27.01.1974 000 all checks consistent
28.01.1974 1212 all checks consistent
29.01.1974 000 all checks consistent
30.01.1974 000 all checks consistent
31.01.1974 000 all checks consistent
01.02.1974 000 all checks consistent
02.02.1974 1111 all checks consistent
03.02.1974 1111 all checks consistent
04.02.1974 1111 all checks consistent
11.02.1974 1616 all checks consistent
12.02.1974 1515 all checks consistent
13.02.1974 41252 all checks consistent
14.02.1974 2828 all checks consistent
15.02.1974 41656 all checks consistent
16.02.1974 41555 all checks consistent
18.02.1974 42464 all checks consistent
19.02.1974 32555 all checks consistent
23.02.1974 21131 all checks consistent
03.03.1974 000 all checks consistent
05.03.1974 1212 all checks consistent
07.03.1974 2929 all checks consistent
09.03.1974 2525 all checks consistent
15.03.1974 3636 all checks consistent
18.03.1974 3636 all checks consistent
19.03.1974 31040 all checks consistent
20.03.1974 1212 all checks consistent
21.03.1974 2222 all checks consistent
22.03.1974 31242 all checks consistent
24.03.1974 2525 all checks consistent
26.03.1974 1111 all checks consistent
27.03.1974 1111 all checks consistent
28.03.1974 2323 all checks consistent
29.03.1974 2727 all checks consistent
30.03.1974 3333 all checks consistent
31.03.1974 3737 all checks consistent
03.04.1974 2626 all checks consistent
04.04.1974 21232 all checks consistent
05.04.1974 21131 all checks consistent
06.04.1974 12333 all checks consistent
08.04.1974 41959 all checks consistent
09.04.1974 54191 all checks consistent
10.04.1974 374104 all checks consistent
11.04.1974 36595 all checks consistent
13.04.1974 36595 all checks consistent
14.04.1974 ——— reading could not be verified
15.04.1974 374104 all checks consistent
17.04.1974 54696 all checks consistent
18.04.1974 42868 all checks consistent
19.04.1974 32252 all checks consistent
20.04.1974 41959 all checks consistent
21.04.1974 31141 all checks consistent
22.04.1974 2626 all checks consistent
23.04.1974 2626 all checks consistent
24.04.1974 11626 all checks consistent
25.04.1974 21636 all checks consistent
27.04.1974 21333 all checks consistent
28.04.1974 1717 all checks consistent
29.04.1974 3333 all checks consistent
30.04.1974 2222 all checks consistent
01.05.1974 41353 counts consistent, some coordinates doubtful
02.05.1974 53989 all checks consistent
03.05.1974 63797 all checks consistent
04.05.1974 857137 all checks consistent
05.05.1974 ——— reading could not be verified
06.05.1974 ——— reading could not be verified
07.05.1974 980170 all checks consistent
08.05.1974 ——— reading could not be verified
09.05.1974 746116 all checks consistent
10.05.1974 63696 all checks consistent
13.05.1974 2929 all checks consistent
14.05.1974 41252 all checks consistent
15.05.1974 2525 all checks consistent
16.05.1974 21030 all checks consistent
17.05.1974 1212 all checks consistent
18.05.1974 000 all checks consistent
20.05.1974 000 all checks consistent
21.05.1974 000 all checks consistent
22.05.1974 1313 all checks consistent
23.05.1974 1313 all checks consistent
24.05.1974 000 all checks consistent
25.05.1974 000 all checks consistent
26.05.1974 21030 all checks consistent
27.05.1974 11525 all checks consistent
28.05.1974 21333 all checks consistent
29.05.1974 1313 all checks consistent
30.05.1974 ——— reading could not be verified
31.05.1974 2929 all checks consistent
01.06.1974 1919 all checks consistent
02.06.1974 12535 all checks consistent
04.06.1974 42666 counts consistent, some coordinates doubtful
05.06.1974 33161 all checks consistent
06.06.1974 746116 all checks consistent
07.06.1974 53181 all checks consistent
08.06.1974 ——— reading could not be verified
09.06.1974 54595 all checks consistent
10.06.1974 63393 counts consistent, some coordinates doubtful
11.06.1974 42666 all checks consistent
12.06.1974 11525 all checks consistent
13.06.1974 33161 all checks consistent
14.06.1974 21535 all checks consistent
15.06.1974 31040 all checks consistent
16.06.1974 ——— reading could not be verified
17.06.1974 21131 all checks consistent
18.06.1974 21434 all checks consistent
19.06.1974 21232 all checks consistent
20.06.1974 11121 all checks consistent
21.06.1974 11121 all checks consistent
22.06.1974 1616 all checks consistent
23.06.1974 1212 all checks consistent
24.06.1974 1212 all checks consistent
25.06.1974 1313 all checks consistent
26.06.1974 1111 all checks consistent
27.06.1974 1111 all checks consistent
28.06.1974 2222 all checks consistent
29.06.1974 21131 all checks consistent
30.06.1974 32656 all checks consistent
01.07.1974 33767 all checks consistent
02.07.1974 36494 all checks consistent
03.07.1974 373103 all checks consistent
04.07.1974 36898 all checks consistent
05.07.1974 560110 all checks consistent
06.07.1974 563113 all checks consistent
07.07.1974 462102 all checks consistent
08.07.1974 52272 all checks consistent
09.07.1974 31747 all checks consistent
10.07.1974 31141 all checks consistent
11.07.1974 21131 all checks consistent
12.07.1974 11222 all checks consistent
13.07.1974 2929 all checks consistent
14.07.1974 51464 all checks consistent
15.07.1974 41050 all checks consistent
16.07.1974 31848 all checks consistent
17.07.1974 42161 all checks consistent
18.07.1974 42767 all checks consistent
19.07.1974 42969 all checks consistent
20.07.1974 ——— reading could not be verified
21.07.1974 62181 all checks consistent
22.07.1974 41656 counts consistent, some coordinates doubtful
23.07.1974 ——— reading could not be verified
24.07.1974 42666 all checks consistent
25.07.1974 44282 all checks consistent
26.07.1974 53282 all checks consistent
27.07.1974 42969 all checks consistent
28.07.1974 42969 all checks consistent
29.07.1974 42565 all checks consistent
30.07.1974 62686 all checks consistent
31.07.1974 32454 all checks consistent
01.08.1974 42060 all checks consistent
02.08.1974 11626 all checks consistent
03.08.1974 1313 all checks consistent
04.08.1974 2525 all checks consistent
05.08.1974 2222 all checks consistent
06.08.1974 2626 all checks consistent
07.08.1974 31040 all checks consistent
08.08.1974 31545 all checks consistent
09.08.1974 51767 all checks consistent
10.08.1974 41454 all checks consistent
11.08.1974 52272 all checks consistent
12.08.1974 62989 counts consistent, some coordinates doubtful
13.08.1974 72393 all checks consistent
15.08.1974 71686 all checks consistent
16.08.1974 62383 all checks consistent
17.08.1974 44484 all checks consistent
18.08.1974 42464 all checks consistent
19.08.1974 51060 all checks consistent
20.08.1974 3333 all checks consistent
21.08.1974 41050 all checks consistent
22.08.1974 31545 all checks consistent
23.08.1974 31646 all checks consistent
24.08.1974 3939 all checks consistent
25.08.1974 3838 all checks consistent
26.08.1974 1111 all checks consistent
27.08.1974 1111 all checks consistent
28.08.1974 1212 all checks consistent
29.08.1974 2222 all checks consistent
30.08.1974 1111 all checks consistent
31.08.1974 1111 all checks consistent
01.09.1974 1111 all checks consistent
02.09.1974 1111 all checks consistent
03.09.1974 2222 all checks consistent
04.09.1974 4444 all checks consistent
05.09.1974 5858 all checks consistent
06.09.1974 71383 all checks consistent
07.09.1974 3333 all checks consistent
08.09.1974 3333 all checks consistent
09.09.1974 61272 all checks consistent
10.09.1974 62787 all checks consistent
11.09.1974 62989 all checks consistent
12.09.1974 731101 all checks consistent
13.09.1974 43878 counts consistent, some coordinates doubtful
14.09.1974 43878 all checks consistent
15.09.1974 44484 all checks consistent
16.09.1974 44080 all checks consistent
17.09.1974 43070 all checks consistent
18.09.1974 53181 all checks consistent
19.09.1974 52777 counts consistent, some coordinates doubtful
20.09.1974 31343 all checks consistent
21.09.1974 1313 all checks consistent
22.09.1974 000 all checks consistent
23.09.1974 1111 all checks consistent
24.09.1974 1616 all checks consistent
25.09.1974 1919 all checks consistent
26.09.1974 1818 all checks consistent
27.09.1974 2727 all checks consistent
28.09.1974 3636 all checks consistent
29.09.1974 41656 all checks consistent
30.09.1974 53080 all checks consistent
01.10.1974 43777 all checks consistent
02.10.1974 33161 all checks consistent
03.10.1974 41858 all checks consistent
04.10.1974 62282 all checks consistent
05.10.1974 ——— reading could not be verified
06.10.1974 72696 all checks consistent
07.10.1974 54292 all checks consistent
08.10.1974 551101 all checks consistent
09.10.1974 676136 counts consistent, some coordinates doubtful
10.10.1974 390120 all checks consistent
11.10.1974 ——— reading could not be verified
12.10.1974 290110 all checks consistent
13.10.1974 297117 all checks consistent
14.10.1974 ——— reading could not be verified
15.10.1974 14050 all checks consistent
16.10.1974 12232 all checks consistent
17.10.1974 1717 all checks consistent
18.10.1974 1313 all checks consistent
20.10.1974 1717 all checks consistent
21.10.1974 1717 all checks consistent
22.10.1974 1414 all checks consistent
23.10.1974 1313 all checks consistent
24.10.1974 1212 all checks consistent
26.10.1974 2626 all checks consistent
27.10.1974 51767 all checks consistent
28.10.1974 3838 all checks consistent
29.10.1974 2424 all checks consistent
31.10.1974 2323 all checks consistent
01.11.1974 ——— reading could not be verified
02.11.1974 2525 all checks consistent
03.11.1974 41252 all checks consistent
04.11.1974 43171 counts consistent, some coordinates doubtful
05.11.1974 22343 all checks consistent
06.11.1974 21131 all checks consistent
07.11.1974 2424 all checks consistent
11.11.1974 2929 all checks consistent
12.11.1974 21131 all checks consistent
13.11.1974 2424 all checks consistent
14.11.1974 1111 all checks consistent
15.11.1974 1212 all checks consistent
16.11.1974 1717 all checks consistent
17.11.1974 21333 all checks consistent
18.11.1974 1717 all checks consistent
19.11.1974 3939 all checks consistent
20.11.1974 32151 all checks consistent
21.11.1974 32050 all checks consistent
22.11.1974 42969 all checks consistent
23.11.1974 21838 all checks consistent
24.11.1974 2626 all checks consistent
25.11.1974 2424 all checks consistent
26.11.1974 1111 all checks consistent
28.11.1974 11020 all checks consistent
29.11.1974 1414 all checks consistent
02.12.1974 000 all checks consistent
04.12.1974 000 all checks consistent
05.12.1974 1212 all checks consistent
06.12.1974 1212 all checks consistent
12.12.1974 22646 all checks consistent
13.12.1974 21535 all checks consistent
14.12.1974 21737 all checks consistent
15.12.1974 2828 all checks consistent
16.12.1974 21838 all checks consistent
18.12.1974 2424 all checks consistent
20.12.1974 3939 all checks consistent
21.12.1974 3737 all checks consistent
22.12.1974 2222 all checks consistent
23.12.1974 3838 all checks consistent
24.12.1974 2424 all checks consistent
28.12.1974 21030 all checks consistent
29.12.1974 2323 all checks consistent
30.12.1974 31242 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.