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 1993 265 sheets · 241 usable · mean R 70.0

DrawingDategfRReading
08.01.1993 839119 all checks consistent
09.01.1993 939129 all checks consistent
10.01.1993 844124 counts consistent, some coordinates doubtful
11.01.1993 830110 all checks consistent
12.01.1993 872152 all checks consistent
13.01.1993 743113 all checks consistent
14.01.1993 53686 counts consistent, some coordinates doubtful
15.01.1993 2626 all checks consistent
16.01.1993 63292 all checks consistent
17.01.1993 54090 counts consistent, some coordinates doubtful
18.01.1993 ——— reading could not be verified
19.01.1993 63999 all checks consistent
22.01.1993 2323 all checks consistent
23.01.1993 3838 counts consistent, some coordinates doubtful
24.01.1993 ——— reading could not be verified
25.01.1993 ——— reading could not be verified
27.01.1993 51161 counts consistent, some coordinates doubtful
28.01.1993 31141 counts consistent, some coordinates doubtful
29.01.1993 3838 all checks consistent
31.01.1993 31949 counts consistent, some coordinates doubtful
01.02.1993 2525 all checks consistent
04.02.1993 52575 all checks consistent
05.02.1993 555105 all checks consistent
06.02.1993 778148 all checks consistent
08.02.1993 777147 all checks consistent
09.02.1993 976166 counts consistent, some coordinates doubtful
14.02.1993 54595 all checks consistent
16.02.1993 62888 all checks consistent
17.02.1993 52979 all checks consistent
18.02.1993 43979 all checks consistent
19.02.1993 ——— reading could not be verified
20.02.1993 3737 all checks consistent
21.02.1993 62686 all checks consistent
23.02.1993 63393 all checks consistent
27.02.1993 644104 all checks consistent
28.02.1993 749119 all checks consistent
01.03.1993 44686 all checks consistent
03.03.1993 54797 all checks consistent
08.03.1993 465105 counts consistent, some coordinates doubtful
09.03.1993 ——— reading could not be verified
11.03.1993 660120 all checks consistent
12.03.1993 32151 all checks consistent
13.03.1993 42868 all checks consistent
14.03.1993 31646 all checks consistent
15.03.1993 41858 all checks consistent
16.03.1993 42262 all checks consistent
17.03.1993 43171 all checks consistent
18.03.1993 ——— reading could not be verified
20.03.1993 ——— reading could not be verified
21.03.1993 ——— reading could not be verified
22.03.1993 773143 all checks consistent
23.03.1993 62989 all checks consistent
24.03.1993 61979 all checks consistent
25.03.1993 52171 all checks consistent
26.03.1993 41050 all checks consistent
27.03.1993 41555 all checks consistent
28.03.1993 42767 counts consistent, some coordinates doubtful
29.03.1993 51767 all checks consistent
30.03.1993 35585 all checks consistent
31.03.1993 33666 all checks consistent
02.04.1993 550100 all checks consistent
03.04.1993 53888 all checks consistent
04.04.1993 53080 all checks consistent
05.04.1993 63898 all checks consistent
06.04.1993 749119 all checks consistent
08.04.1993 484124 all checks consistent
09.04.1993 5109159 all checks consistent
10.04.1993 45898 all checks consistent
12.04.1993 21737 all checks consistent
13.04.1993 2525 all checks consistent
14.04.1993 1515 all checks consistent
16.04.1993 1515 all checks consistent
19.04.1993 54494 all checks consistent
20.04.1993 773143 all checks consistent
21.04.1993 684144 all checks consistent
22.04.1993 656116 all checks consistent
23.04.1993 786156 all checks consistent
25.04.1993 970160 all checks consistent
26.04.1993 42767 all checks consistent
27.04.1993 735105 all checks consistent
28.04.1993 62888 all checks consistent
29.04.1993 42161 all checks consistent
30.04.1993 51060 all checks consistent
03.05.1993 31444 all checks consistent
04.05.1993 62989 counts consistent, some coordinates doubtful
07.05.1993 ——— reading could not be verified
13.05.1993 563113 counts consistent, some coordinates doubtful
14.05.1993 ——— reading could not be verified
15.05.1993 41858 all checks consistent
16.05.1993 41050 all checks consistent
18.05.1993 41050 all checks consistent
19.05.1993 1414 all checks consistent
20.05.1993 2424 all checks consistent
21.05.1993 3434 counts consistent, some coordinates doubtful
22.05.1993 2222 all checks consistent
23.05.1993 2525 all checks consistent
25.05.1993 ——— reading could not be verified
26.05.1993 62686 all checks consistent
27.05.1993 23252 all checks consistent
28.05.1993 468108 all checks consistent
29.05.1993 466106 all checks consistent
30.05.1993 386116 all checks consistent
31.05.1993 478118 all checks consistent
02.06.1993 768138 all checks consistent
03.06.1993 792162 all checks consistent
04.06.1993 992182 all checks consistent
07.06.1993 1071171 all checks consistent
08.06.1993 44585 all checks consistent
09.06.1993 32757 all checks consistent
10.06.1993 33565 all checks consistent
11.06.1993 42868 all checks consistent
12.06.1993 2222 all checks consistent
13.06.1993 ——— reading could not be verified
14.06.1993 1212 all checks consistent
15.06.1993 1111 all checks consistent
16.06.1993 2323 all checks consistent
17.06.1993 1111 all checks consistent
18.06.1993 2222 all checks consistent
19.06.1993 ——— reading could not be verified
20.06.1993 22949 all checks consistent
21.06.1993 21535 all checks consistent
22.06.1993 31444 all checks consistent
23.06.1993 42262 all checks consistent
24.06.1993 42161 all checks consistent
25.06.1993 52878 all checks consistent
26.06.1993 43575 all checks consistent
28.06.1993 54999 all checks consistent
29.06.1993 672132 all checks consistent
30.06.1993 45797 all checks consistent
01.07.1993 34070 all checks consistent
02.07.1993 44989 all checks consistent
03.07.1993 952142 all checks consistent
04.07.1993 1274194 counts consistent, some coordinates doubtful
05.07.1993 748118 all checks consistent
06.07.1993 42262 all checks consistent
07.07.1993 52575 all checks consistent
09.07.1993 31646 all checks consistent
10.07.1993 3737 all checks consistent
11.07.1993 32050 counts consistent, some coordinates doubtful
12.07.1993 31141 counts consistent, some coordinates doubtful
13.07.1993 52777 counts consistent, some coordinates doubtful
15.07.1993 53282 all checks consistent
16.07.1993 42666 all checks consistent
17.07.1993 51868 counts consistent, some coordinates doubtful
18.07.1993 63999 counts consistent, some coordinates doubtful
19.07.1993 731101 all checks consistent
20.07.1993 63191 all checks consistent
21.07.1993 53484 all checks consistent
23.07.1993 62383 counts consistent, some coordinates doubtful
24.07.1993 62181 counts consistent, some coordinates doubtful
26.07.1993 ——— reading could not be verified
27.07.1993 734104 all checks consistent
28.07.1993 ——— reading could not be verified
29.07.1993 33666 all checks consistent
30.07.1993 ——— reading could not be verified
31.07.1993 51767 counts consistent, some coordinates doubtful
01.08.1993 41555 all checks consistent
02.08.1993 4545 all checks consistent
03.08.1993 3737 all checks consistent
04.08.1993 31040 all checks consistent
05.08.1993 2525 all checks consistent
06.08.1993 42565 all checks consistent
07.08.1993 42565 all checks consistent
08.08.1993 33262 all checks consistent
09.08.1993 42363 all checks consistent
10.08.1993 63494 counts consistent, some coordinates doubtful
11.08.1993 63494 all checks consistent
13.08.1993 740110 counts consistent, some coordinates doubtful
14.08.1993 834114 all checks consistent
15.08.1993 33262 all checks consistent
16.08.1993 31444 all checks consistent
17.08.1993 31040 all checks consistent
18.08.1993 1616 all checks consistent
19.08.1993 2828 all checks consistent
20.08.1993 21333 all checks consistent
21.08.1993 41656 all checks consistent
22.08.1993 52272 all checks consistent
23.08.1993 41252 all checks consistent
24.08.1993 52070 counts consistent, some coordinates doubtful
25.08.1993 51767 all checks consistent
26.08.1993 62282 all checks consistent
27.08.1993 53282 all checks consistent
28.08.1993 41656 all checks consistent
29.08.1993 52373 all checks consistent
01.09.1993 3333 all checks consistent
03.09.1993 2323 all checks consistent
05.09.1993 21535 all checks consistent
06.09.1993 1717 all checks consistent
07.09.1993 1313 all checks consistent
08.09.1993 1313 all checks consistent
09.09.1993 2727 all checks consistent
10.09.1993 000 all checks consistent
11.09.1993 ——— reading could not be verified
12.09.1993 ——— reading could not be verified
13.09.1993 2525 all checks consistent
14.09.1993 1212 all checks consistent
15.09.1993 1212 all checks consistent
16.09.1993 31343 all checks consistent
17.09.1993 21232 all checks consistent
18.09.1993 11222 all checks consistent
19.09.1993 11323 all checks consistent
20.09.1993 22444 all checks consistent
21.09.1993 2727 all checks consistent
22.09.1993 ——— reading could not be verified
23.09.1993 21131 all checks consistent
24.09.1993 12232 all checks consistent
25.09.1993 33767 all checks consistent
26.09.1993 34272 counts consistent, some coordinates doubtful
27.09.1993 32959 all checks consistent
28.09.1993 42262 all checks consistent
29.09.1993 32555 all checks consistent
01.10.1993 35181 counts consistent, some coordinates doubtful
02.10.1993 484124 all checks consistent
03.10.1993 3101131 all checks consistent
04.10.1993 487127 all checks consistent
05.10.1993 473113 all checks consistent
06.10.1993 36797 all checks consistent
07.10.1993 25979 all checks consistent
08.10.1993 45090 all checks consistent
09.10.1993 45696 all checks consistent
10.10.1993 34575 all checks consistent
11.10.1993 54595 all checks consistent
12.10.1993 22040 all checks consistent
13.10.1993 21737 all checks consistent
14.10.1993 21636 all checks consistent
15.10.1993 41555 all checks consistent
16.10.1993 ——— reading could not be verified
17.10.1993 31848 all checks consistent
18.10.1993 ——— reading could not be verified
20.10.1993 ——— reading could not be verified
21.10.1993 42767 all checks consistent
22.10.1993 31646 all checks consistent
23.10.1993 43272 all checks consistent
24.10.1993 41858 all checks consistent
25.10.1993 41151 all checks consistent
27.10.1993 62585 all checks consistent
28.10.1993 ——— reading could not be verified
29.10.1993 2626 all checks consistent
02.11.1993 1414 all checks consistent
03.11.1993 11525 all checks consistent
06.11.1993 2525 all checks consistent
07.11.1993 2929 all checks consistent
08.11.1993 31242 all checks consistent
12.11.1993 1313 all checks consistent
15.11.1993 12636 all checks consistent
19.11.1993 24565 all checks consistent
20.11.1993 22545 all checks consistent
21.11.1993 43575 all checks consistent
29.11.1993 41858 counts consistent, some coordinates doubtful
04.12.1993 63797 all checks consistent
05.12.1993 53585 counts consistent, some coordinates doubtful
08.12.1993 36898 all checks consistent
09.12.1993 650110 all checks consistent
11.12.1993 32353 all checks consistent
13.12.1993 2525 all checks consistent
14.12.1993 1111 all checks consistent
15.12.1993 1111 all checks consistent
17.12.1993 2626 all checks consistent
18.12.1993 3737 counts consistent, some coordinates doubtful
19.12.1993 3737 all checks consistent
20.12.1993 3434 all checks consistent
21.12.1993 3636 all checks consistent
22.12.1993 31747 all checks consistent
25.12.1993 ——— reading could not be verified
28.12.1993 2130150 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.