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 1966 261 sheets · 224 usable · mean R 62.1

DrawingDategfRReading
03.01.1966 2323 all checks consistent
07.01.1966 000 all checks consistent
10.01.1966 000 all checks consistent
11.01.1966 000 all checks consistent
12.01.1966 000 all checks consistent
14.01.1966 31747 all checks consistent
15.01.1966 21333 all checks consistent
17.01.1966 12030 all checks consistent
18.01.1966 22747 all checks consistent
19.01.1966 34373 counts consistent, some coordinates doubtful
21.01.1966 31848 all checks consistent
23.01.1966 ——— reading could not be verified
27.01.1966 11323 all checks consistent
01.02.1966 000 all checks consistent
03.02.1966 21131 all checks consistent
04.02.1966 11323 all checks consistent
06.02.1966 11020 all checks consistent
07.02.1966 1515 all checks consistent
09.02.1966 1414 all checks consistent
10.02.1966 1919 all checks consistent
11.02.1966 ——— reading could not be verified
12.02.1966 ——— reading could not be verified
14.02.1966 1212 all checks consistent
15.02.1966 1818 all checks consistent
17.02.1966 ——— reading could not be verified
18.02.1966 21434 all checks consistent
19.02.1966 21333 all checks consistent
20.02.1966 33161 all checks consistent
22.02.1966 31646 counts consistent, some coordinates doubtful
24.02.1966 32151 all checks consistent
25.02.1966 ——— reading could not be verified
26.02.1966 31848 all checks consistent
27.02.1966 31545 all checks consistent
28.02.1966 2525 all checks consistent
01.03.1966 1111 all checks consistent
02.03.1966 1515 all checks consistent
03.03.1966 1515 all checks consistent
06.03.1966 1818 all checks consistent
12.03.1966 000 all checks consistent
13.03.1966 000 all checks consistent
14.03.1966 000 all checks consistent
18.03.1966 24969 counts consistent, some coordinates doubtful
19.03.1966 33565 all checks consistent
21.03.1966 12838 all checks consistent
22.03.1966 22646 all checks consistent
23.03.1966 22040 all checks consistent
24.03.1966 11323 all checks consistent
25.03.1966 2929 all checks consistent
28.03.1966 1212 all checks consistent
29.03.1966 21333 all checks consistent
30.03.1966 22040 all checks consistent
01.04.1966 ——— reading could not be verified
02.04.1966 25272 all checks consistent
03.04.1966 45292 all checks consistent
08.04.1966 33363 all checks consistent
09.04.1966 33060 all checks consistent
10.04.1966 14252 all checks consistent
11.04.1966 12131 all checks consistent
12.04.1966 2626 all checks consistent
13.04.1966 1717 all checks consistent
14.04.1966 11222 all checks consistent
16.04.1966 22545 all checks consistent
17.04.1966 32050 all checks consistent
18.04.1966 11525 all checks consistent
19.04.1966 21737 all checks consistent
20.04.1966 42565 all checks consistent
21.04.1966 43474 all checks consistent
22.04.1966 ——— reading could not be verified
23.04.1966 52373 all checks consistent
24.04.1966 32454 all checks consistent
27.04.1966 1818 all checks consistent
28.04.1966 31343 all checks consistent
29.04.1966 51363 all checks consistent
01.05.1966 ——— reading could not be verified
02.05.1966 51868 counts consistent, some coordinates doubtful
30.05.1966 33464 all checks consistent
31.05.1966 62080 all checks consistent
01.06.1966 52979 all checks consistent
03.06.1966 41858 all checks consistent
04.06.1966 72090 all checks consistent
05.06.1966 42666 all checks consistent
06.06.1966 ——— reading could not be verified
08.06.1966 31040 all checks consistent
09.06.1966 21939 all checks consistent
10.06.1966 21030 all checks consistent
11.06.1966 ——— reading could not be verified
12.06.1966 34777 all checks consistent
13.06.1966 21838 all checks consistent
14.06.1966 2727 all checks consistent
15.06.1966 21131 all checks consistent
16.06.1966 ——— reading could not be verified
17.06.1966 42060 all checks consistent
18.06.1966 22343 all checks consistent
19.06.1966 ——— reading could not be verified
20.06.1966 2929 all checks consistent
21.06.1966 41252 all checks consistent
22.06.1966 3838 all checks consistent
23.06.1966 54797 counts consistent, some coordinates doubtful
24.06.1966 53383 all checks consistent
25.06.1966 650110 all checks consistent
26.06.1966 750120 all checks consistent
27.06.1966 63191 all checks consistent
28.06.1966 51262 all checks consistent
29.06.1966 51666 counts consistent, some coordinates doubtful
30.06.1966 54191 all checks consistent
01.07.1966 ——— reading could not be verified
02.07.1966 31747 all checks consistent
03.07.1966 ——— reading could not be verified
04.07.1966 33969 counts consistent, some coordinates doubtful
05.07.1966 22444 all checks consistent
06.07.1966 23959 all checks consistent
07.07.1966 44989 all checks consistent
08.07.1966 45191 all checks consistent
10.07.1966 63999 all checks consistent
11.07.1966 42969 all checks consistent
12.07.1966 ——— reading could not be verified
13.07.1966 62181 all checks consistent
14.07.1966 ——— reading could not be verified
15.07.1966 41353 all checks consistent
16.07.1966 ——— reading could not be verified
17.07.1966 51363 counts consistent, some coordinates doubtful
18.07.1966 62989 all checks consistent
19.07.1966 41454 counts consistent, some coordinates doubtful
20.07.1966 51464 all checks consistent
21.07.1966 ——— reading could not be verified
22.07.1966 ——— reading could not be verified
23.07.1966 733103 all checks consistent
24.07.1966 648108 all checks consistent
25.07.1966 669129 all checks consistent
26.07.1966 44989 all checks consistent
27.07.1966 52474 all checks consistent
28.07.1966 63191 counts consistent, some coordinates doubtful
29.07.1966 63797 all checks consistent
30.07.1966 53787 counts consistent, some coordinates doubtful
31.07.1966 641101 all checks consistent
01.08.1966 ——— reading could not be verified
02.08.1966 53383 all checks consistent
03.08.1966 44787 all checks consistent
04.08.1966 740110 counts consistent, some coordinates doubtful
05.08.1966 931121 counts consistent, some coordinates doubtful
06.08.1966 72090 counts consistent, some coordinates doubtful
07.08.1966 ——— reading could not be verified
08.08.1966 51161 all checks consistent
09.08.1966 41252 all checks consistent
10.08.1966 3737 counts consistent, some coordinates doubtful
11.08.1966 1313 all checks consistent
12.08.1966 ——— reading could not be verified
13.08.1966 22040 all checks consistent
14.08.1966 42767 counts consistent, some coordinates doubtful
15.08.1966 53383 counts consistent, some coordinates doubtful
16.08.1966 ——— reading could not be verified
17.08.1966 42161 all checks consistent
18.08.1966 41959 counts consistent, some coordinates doubtful
19.08.1966 41959 all checks consistent
20.08.1966 31141 all checks consistent
21.08.1966 61474 all checks consistent
22.08.1966 61474 counts consistent, some coordinates doubtful
23.08.1966 52878 counts consistent, some coordinates doubtful
24.08.1966 ——— reading could not be verified
25.08.1966 ——— reading could not be verified
26.08.1966 ——— reading could not be verified
27.08.1966 690150 all checks consistent
28.08.1966 476116 all checks consistent
30.08.1966 63595 counts consistent, some coordinates doubtful
31.08.1966 12737 all checks consistent
01.09.1966 13343 all checks consistent
02.09.1966 34070 all checks consistent
03.09.1966 11727 all checks consistent
04.09.1966 2828 all checks consistent
05.09.1966 21030 all checks consistent
06.09.1966 4444 counts consistent, some coordinates doubtful
08.09.1966 2727 all checks consistent
10.09.1966 31747 all checks consistent
11.09.1966 53989 all checks consistent
12.09.1966 ——— reading could not be verified
13.09.1966 21232 counts consistent, some coordinates doubtful
14.09.1966 22242 counts consistent, some coordinates doubtful
15.09.1966 ——— reading could not be verified
16.09.1966 32757 counts consistent, some coordinates doubtful
17.09.1966 ——— reading could not be verified
18.09.1966 592142 all checks consistent
19.09.1966 45090 all checks consistent
20.09.1966 34979 all checks consistent
21.09.1966 44787 all checks consistent
22.09.1966 44989 counts consistent, some coordinates doubtful
23.09.1966 35080 all checks consistent
24.09.1966 473113 counts consistent, some coordinates doubtful
25.09.1966 4101141 all checks consistent
26.09.1966 26484 all checks consistent
27.09.1966 23151 counts consistent, some coordinates doubtful
28.09.1966 32656 all checks consistent
29.09.1966 33565 all checks consistent
30.09.1966 43878 all checks consistent
01.10.1966 54393 all checks consistent
02.10.1966 44080 all checks consistent
03.10.1966 42161 all checks consistent
04.10.1966 ——— reading could not be verified
06.10.1966 33767 counts consistent, some coordinates doubtful
07.10.1966 33666 all checks consistent
08.10.1966 34777 all checks consistent
09.10.1966 42666 counts consistent, some coordinates doubtful
10.10.1966 ——— reading could not be verified
11.10.1966 736106 all checks consistent
12.10.1966 52070 counts consistent, some coordinates doubtful
13.10.1966 829109 counts consistent, some coordinates doubtful
14.10.1966 952142 all checks consistent
15.10.1966 573123 all checks consistent
16.10.1966 43878 all checks consistent
17.10.1966 33060 all checks consistent
18.10.1966 ——— reading could not be verified
19.10.1966 54999 counts consistent, some coordinates doubtful
20.10.1966 ——— reading could not be verified
21.10.1966 ——— reading could not be verified
22.10.1966 552102 all checks consistent
23.10.1966 54494 all checks consistent
24.10.1966 63090 counts consistent, some coordinates doubtful
25.10.1966 42969 all checks consistent
26.10.1966 41959 all checks consistent
27.10.1966 31545 all checks consistent
28.10.1966 71080 all checks consistent
29.10.1966 21838 all checks consistent
30.10.1966 22141 all checks consistent
31.10.1966 31444 all checks consistent
01.11.1966 41454 all checks consistent
02.11.1966 41757 counts consistent, some coordinates doubtful
03.11.1966 31343 all checks consistent
04.11.1966 51161 all checks consistent
06.11.1966 2828 all checks consistent
08.11.1966 53282 all checks consistent
09.11.1966 43373 counts consistent, some coordinates doubtful
11.11.1966 44080 all checks consistent
12.11.1966 43575 counts consistent, some coordinates doubtful
14.11.1966 42464 all checks consistent
15.11.1966 62282 all checks consistent
16.11.1966 32656 all checks consistent
17.11.1966 ——— reading could not be verified
18.11.1966 51666 all checks consistent
19.11.1966 71484 all checks consistent
20.11.1966 640100 all checks consistent
22.11.1966 45595 all checks consistent
27.11.1966 54191 all checks consistent
29.11.1966 62686 all checks consistent
30.11.1966 31949 all checks consistent
01.12.1966 3737 all checks consistent
02.12.1966 3636 counts consistent, some coordinates doubtful
03.12.1966 2424 all checks consistent
05.12.1966 61676 all checks consistent
06.12.1966 62080 all checks consistent
07.12.1966 51767 counts consistent, some coordinates doubtful
10.12.1966 45999 counts consistent, some coordinates doubtful
11.12.1966 5160210 all checks consistent
13.12.1966 787157 all checks consistent
14.12.1966 460100 counts consistent, some coordinates doubtful
15.12.1966 747117 all checks consistent
17.12.1966 63898 counts consistent, some coordinates doubtful
19.12.1966 ——— reading could not be verified
20.12.1966 5656 all checks consistent
27.12.1966 52575 counts consistent, some coordinates doubtful
28.12.1966 53282 counts consistent, some coordinates doubtful
29.12.1966 63090 counts consistent, some coordinates doubtful
30.12.1966 ——— reading could not be verified

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.