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 2004 280 sheets · 266 usable · mean R 61.5

DrawingDategfRReading
01.01.2004 41959 all checks consistent
02.01.2004 31444 all checks consistent
06.01.2004 22141 all checks consistent
07.01.2004 21535 all checks consistent
09.01.2004 23656 all checks consistent
10.01.2004 22343 all checks consistent
14.01.2004 31040 all checks consistent
17.01.2004 42969 all checks consistent
18.01.2004 32151 all checks consistent
19.01.2004 42565 all checks consistent
20.01.2004 32656 all checks consistent
25.01.2004 2222 all checks consistent
27.01.2004 000 all checks consistent
01.02.2004 52979 all checks consistent
02.02.2004 53181 all checks consistent
06.02.2004 43676 all checks consistent
07.02.2004 23555 all checks consistent
08.02.2004 35181 all checks consistent
09.02.2004 31646 all checks consistent
10.02.2004 31141 all checks consistent
11.02.2004 41959 all checks consistent
14.02.2004 31040 all checks consistent
15.02.2004 51868 all checks consistent
16.02.2004 51262 all checks consistent
17.02.2004 2222 all checks consistent
18.02.2004 2222 all checks consistent
19.02.2004 2222 counts consistent, some coordinates doubtful
22.02.2004 31040 all checks consistent
25.02.2004 33060 all checks consistent
26.02.2004 43171 all checks consistent
27.02.2004 51969 all checks consistent
28.02.2004 41959 all checks consistent
29.02.2004 54393 all checks consistent
01.03.2004 ——— reading could not be verified
02.03.2004 22545 counts consistent, some coordinates doubtful
05.03.2004 32555 all checks consistent
07.03.2004 31646 all checks consistent
08.03.2004 31444 all checks consistent
10.03.2004 21232 all checks consistent
12.03.2004 32151 all checks consistent
13.03.2004 ——— reading could not be verified
14.03.2004 31747 all checks consistent
15.03.2004 3939 all checks consistent
16.03.2004 3535 all checks consistent
17.03.2004 4747 all checks consistent
18.03.2004 31343 all checks consistent
19.03.2004 52272 all checks consistent
20.03.2004 44484 all checks consistent
21.03.2004 33464 all checks consistent
22.03.2004 43474 all checks consistent
23.03.2004 44282 all checks consistent
24.03.2004 45393 all checks consistent
25.03.2004 1059159 all checks consistent
26.03.2004 824104 all checks consistent
27.03.2004 934124 all checks consistent
28.03.2004 61676 all checks consistent
29.03.2004 42363 all checks consistent
30.03.2004 52979 all checks consistent
31.03.2004 43474 all checks consistent
01.04.2004 3434 all checks consistent
02.04.2004 41252 all checks consistent
03.04.2004 51060 all checks consistent
04.04.2004 51969 all checks consistent
05.04.2004 62282 all checks consistent
06.04.2004 31444 all checks consistent
07.04.2004 51969 all checks consistent
08.04.2004 2727 all checks consistent
09.04.2004 2929 all checks consistent
10.04.2004 ——— reading could not be verified
11.04.2004 2323 all checks consistent
12.04.2004 3636 all checks consistent
14.04.2004 41858 all checks consistent
16.04.2004 3737 all checks consistent
20.04.2004 42767 all checks consistent
22.04.2004 32353 all checks consistent
23.04.2004 31949 all checks consistent
24.04.2004 41353 all checks consistent
25.04.2004 21434 all checks consistent
26.04.2004 31141 all checks consistent
29.04.2004 3535 all checks consistent
30.04.2004 31343 all checks consistent
01.05.2004 42565 all checks consistent
02.05.2004 32656 all checks consistent
03.05.2004 31848 all checks consistent
04.05.2004 42363 all checks consistent
05.05.2004 32050 all checks consistent
06.05.2004 2929 all checks consistent
07.05.2004 2525 all checks consistent
08.05.2004 21232 all checks consistent
09.05.2004 2626 all checks consistent
10.05.2004 5858 all checks consistent
11.05.2004 41050 all checks consistent
12.05.2004 51868 all checks consistent
13.05.2004 43171 all checks consistent
15.05.2004 461101 all checks consistent
16.05.2004 749119 all checks consistent
17.05.2004 743113 all checks consistent
18.05.2004 63494 all checks consistent
19.05.2004 62787 all checks consistent
20.05.2004 63090 all checks consistent
21.05.2004 52272 all checks consistent
22.05.2004 43474 all checks consistent
23.05.2004 652112 all checks consistent
24.05.2004 53787 all checks consistent
25.05.2004 43070 all checks consistent
26.05.2004 33464 all checks consistent
27.05.2004 23757 all checks consistent
28.05.2004 33565 all checks consistent
30.05.2004 32656 all checks consistent
02.06.2004 22242 all checks consistent
03.06.2004 41656 all checks consistent
04.06.2004 ——— reading could not be verified
05.06.2004 31646 all checks consistent
06.06.2004 31040 all checks consistent
07.06.2004 41151 all checks consistent
08.06.2004 3636 all checks consistent
09.06.2004 51868 all checks consistent
10.06.2004 3636 all checks consistent
11.06.2004 3636 all checks consistent
12.06.2004 ——— reading could not be verified
13.06.2004 4949 all checks consistent
14.06.2004 41050 all checks consistent
15.06.2004 32252 all checks consistent
16.06.2004 732102 all checks consistent
17.06.2004 43979 all checks consistent
20.06.2004 675135 all checks consistent
21.06.2004 ——— reading could not be verified
22.06.2004 765135 all checks consistent
24.06.2004 54494 all checks consistent
25.06.2004 42161 all checks consistent
26.06.2004 42767 all checks consistent
28.06.2004 31646 all checks consistent
29.06.2004 3737 all checks consistent
30.06.2004 2929 all checks consistent
01.07.2004 21333 all checks consistent
02.07.2004 21232 all checks consistent
03.07.2004 31646 all checks consistent
04.07.2004 31343 all checks consistent
05.07.2004 1515 all checks consistent
06.07.2004 ——— reading could not be verified
08.07.2004 3939 all checks consistent
09.07.2004 31949 all checks consistent
10.07.2004 32050 all checks consistent
11.07.2004 730100 all checks consistent
12.07.2004 52979 all checks consistent
13.07.2004 875155 all checks consistent
14.07.2004 751121 all checks consistent
15.07.2004 751121 all checks consistent
16.07.2004 758128 all checks consistent
17.07.2004 755125 all checks consistent
18.07.2004 7113183 all checks consistent
19.07.2004 497137 all checks consistent
20.07.2004 589139 all checks consistent
21.07.2004 585135 all checks consistent
22.07.2004 481121 all checks consistent
23.07.2004 3121151 all checks consistent
24.07.2004 3104134 counts consistent, some coordinates doubtful
25.07.2004 370100 all checks consistent
26.07.2004 373103 all checks consistent
27.07.2004 35080 all checks consistent
28.07.2004 32353 all checks consistent
29.07.2004 21030 all checks consistent
30.07.2004 21131 all checks consistent
31.07.2004 21030 all checks consistent
02.08.2004 22747 all checks consistent
03.08.2004 22747 all checks consistent
04.08.2004 22343 all checks consistent
05.08.2004 11929 all checks consistent
06.08.2004 22444 all checks consistent
07.08.2004 43676 all checks consistent
08.08.2004 31747 all checks consistent
09.08.2004 44181 all checks consistent
10.08.2004 44282 all checks consistent
11.08.2004 473113 all checks consistent
12.08.2004 487127 all checks consistent
13.08.2004 5101151 all checks consistent
14.08.2004 476116 all checks consistent
17.08.2004 32858 all checks consistent
18.08.2004 42262 all checks consistent
19.08.2004 41858 all checks consistent
20.08.2004 63292 all checks consistent
21.08.2004 45494 all checks consistent
22.08.2004 558108 counts consistent, some coordinates doubtful
24.08.2004 33060 all checks consistent
25.08.2004 31444 all checks consistent
26.08.2004 21030 all checks consistent
27.08.2004 21333 all checks consistent
29.08.2004 2626 all checks consistent
04.09.2004 21333 all checks consistent
05.09.2004 52878 all checks consistent
06.09.2004 41353 all checks consistent
07.09.2004 33161 all checks consistent
08.09.2004 44282 all checks consistent
09.09.2004 43575 all checks consistent
10.09.2004 42969 all checks consistent
11.09.2004 42868 all checks consistent
12.09.2004 33060 all checks consistent
13.09.2004 34676 all checks consistent
14.09.2004 23353 all checks consistent
15.09.2004 33161 all checks consistent
16.09.2004 ——— reading could not be verified
17.09.2004 25575 all checks consistent
18.09.2004 33969 all checks consistent
19.09.2004 32959 all checks consistent
20.09.2004 21737 all checks consistent
21.09.2004 31747 all checks consistent
22.09.2004 31545 all checks consistent
23.09.2004 1717 all checks consistent
24.09.2004 1616 all checks consistent
25.09.2004 2222 all checks consistent
26.09.2004 2222 all checks consistent
27.09.2004 2222 all checks consistent
28.09.2004 1111 all checks consistent
29.09.2004 4747 all checks consistent
30.09.2004 ——— reading could not be verified
01.10.2004 3434 all checks consistent
02.10.2004 2424 all checks consistent
03.10.2004 31646 all checks consistent
04.10.2004 3939 all checks consistent
05.10.2004 3737 all checks consistent
06.10.2004 2424 all checks consistent
09.10.2004 000 all checks consistent
10.10.2004 000 all checks consistent
11.10.2004 000 all checks consistent
15.10.2004 11929 all checks consistent
16.10.2004 12030 all checks consistent
17.10.2004 44181 all checks consistent
18.10.2004 52575 all checks consistent
19.10.2004 53686 all checks consistent
20.10.2004 54797 all checks consistent
21.10.2004 ——— reading could not be verified
23.10.2004 967157 all checks consistent
24.10.2004 ——— reading could not be verified
25.10.2004 681141 all checks consistent
26.10.2004 773143 all checks consistent
28.10.2004 970160 all checks consistent
29.10.2004 876156 all checks consistent
30.10.2004 852132 all checks consistent
31.10.2004 860140 all checks consistent
01.11.2004 ——— reading could not be verified
03.11.2004 ——— reading could not be verified
04.11.2004 43878 all checks consistent
05.11.2004 35787 all checks consistent
06.11.2004 553103 all checks consistent
07.11.2004 44686 all checks consistent
08.11.2004 35080 all checks consistent
09.11.2004 43979 all checks consistent
11.11.2004 42060 all checks consistent
12.11.2004 41353 all checks consistent
17.11.2004 ——— reading could not be verified
18.11.2004 31646 all checks consistent
19.11.2004 51161 all checks consistent
21.11.2004 3636 all checks consistent
22.11.2004 4747 all checks consistent
23.11.2004 2626 all checks consistent
25.11.2004 51363 all checks consistent
26.11.2004 32050 all checks consistent
27.11.2004 42060 all checks consistent
29.11.2004 41353 all checks consistent
01.12.2004 31141 all checks consistent
02.12.2004 31444 all checks consistent
03.12.2004 31242 all checks consistent
04.12.2004 3636 all checks consistent
05.12.2004 5858 all checks consistent
06.12.2004 2323 all checks consistent
08.12.2004 2222 all checks consistent
09.12.2004 1111 all checks consistent
10.12.2004 1515 all checks consistent
12.12.2004 11828 all checks consistent
13.12.2004 11020 all checks consistent
15.12.2004 1111 all checks consistent
16.12.2004 1111 all checks consistent
17.12.2004 41858 all checks consistent
18.12.2004 3737 all checks consistent
24.12.2004 21131 all checks consistent
25.12.2004 1818 all checks consistent
26.12.2004 1616 all checks consistent
27.12.2004 1111 all checks consistent
28.12.2004 2626 all checks consistent
30.12.2004 1717 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.