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 1997 237 sheets · 218 usable · mean R 28.1

DrawingDategfRReading
04.01.1997 000 all checks consistent
05.01.1997 1515 all checks consistent
06.01.1997 1313 all checks consistent
10.01.1997 000 all checks consistent
16.01.1997 2323 all checks consistent
17.01.1997 1111 all checks consistent
18.01.1997 1212 all checks consistent
19.01.1997 000 all checks consistent
20.01.1997 1212 all checks consistent
23.01.1997 000 all checks consistent
24.01.1997 ——— reading could not be verified
26.01.1997 000 all checks consistent
29.01.1997 000 all checks consistent
30.01.1997 1717 all checks consistent
31.01.1997 1717 all checks consistent
02.02.1997 ——— reading could not be verified
03.02.1997 22242 all checks consistent
04.02.1997 22343 all checks consistent
05.02.1997 21939 all checks consistent
06.02.1997 2424 counts consistent, some coordinates doubtful
08.02.1997 ——— reading could not be verified
09.02.1997 1111 all checks consistent
10.02.1997 000 all checks consistent
11.02.1997 000 all checks consistent
12.02.1997 000 all checks consistent
13.02.1997 000 all checks consistent
15.02.1997 000 all checks consistent
16.02.1997 1313 all checks consistent
19.02.1997 1212 all checks consistent
22.02.1997 000 all checks consistent
23.02.1997 000 all checks consistent
24.02.1997 1111 all checks consistent
25.02.1997 000 all checks consistent
26.02.1997 000 all checks consistent
27.02.1997 000 all checks consistent
01.03.1997 000 all checks consistent
02.03.1997 000 all checks consistent
03.03.1997 000 all checks consistent
04.03.1997 000 all checks consistent
05.03.1997 000 all checks consistent
07.03.1997 1313 all checks consistent
09.03.1997 2626 all checks consistent
12.03.1997 1919 all checks consistent
13.03.1997 11121 all checks consistent
15.03.1997 31343 all checks consistent
16.03.1997 2828 all checks consistent
19.03.1997 000 all checks consistent
24.03.1997 000 all checks consistent
25.03.1997 000 all checks consistent
27.03.1997 000 all checks consistent
28.03.1997 11020 all checks consistent
29.03.1997 11222 all checks consistent
30.03.1997 11828 all checks consistent
02.04.1997 22545 all checks consistent
06.04.1997 21131 all checks consistent
10.04.1997 22040 all checks consistent
11.04.1997 21434 all checks consistent
12.04.1997 2828 all checks consistent
14.04.1997 11222 all checks consistent
15.04.1997 21737 all checks consistent
16.04.1997 11626 all checks consistent
17.04.1997 1919 all checks consistent
18.04.1997 1212 all checks consistent
19.04.1997 1212 all checks consistent
23.04.1997 1212 all checks consistent
26.04.1997 ——— reading could not be verified
27.04.1997 1313 all checks consistent
28.04.1997 11020 all checks consistent
29.04.1997 1111 all checks consistent
30.04.1997 000 all checks consistent
03.05.1997 000 all checks consistent
04.05.1997 000 all checks consistent
05.05.1997 1111 all checks consistent
06.05.1997 1111 all checks consistent
07.05.1997 1313 all checks consistent
08.05.1997 ——— reading could not be verified
09.05.1997 1717 all checks consistent
10.05.1997 2424 all checks consistent
11.05.1997 2424 all checks consistent
12.05.1997 1212 all checks consistent
13.05.1997 1414 all checks consistent
14.05.1997 1616 all checks consistent
15.05.1997 1313 all checks consistent
16.05.1997 2424 all checks consistent
17.05.1997 2323 all checks consistent
18.05.1997 ——— reading could not be verified
19.05.1997 21838 all checks consistent
20.05.1997 32151 all checks consistent
21.05.1997 45797 all checks consistent
22.05.1997 43878 all checks consistent
24.05.1997 31141 all checks consistent
25.05.1997 3535 all checks consistent
26.05.1997 4848 all checks consistent
28.05.1997 1414 all checks consistent
30.05.1997 2424 all checks consistent
02.06.1997 21434 all checks consistent
03.06.1997 ——— reading could not be verified
05.06.1997 1616 all checks consistent
06.06.1997 11323 all checks consistent
09.06.1997 ——— reading could not be verified
13.06.1997 2727 all checks consistent
14.06.1997 21636 all checks consistent
15.06.1997 21131 all checks consistent
16.06.1997 11222 all checks consistent
17.06.1997 1919 all checks consistent
18.06.1997 21232 all checks consistent
19.06.1997 1717 all checks consistent
20.06.1997 1313 all checks consistent
21.06.1997 1212 all checks consistent
22.06.1997 000 all checks consistent
23.06.1997 000 all checks consistent
24.06.1997 1515 all checks consistent
25.06.1997 11626 all checks consistent
27.06.1997 11121 all checks consistent
29.06.1997 ——— reading could not be verified
30.06.1997 000 all checks consistent
01.07.1997 000 all checks consistent
02.07.1997 000 all checks consistent
03.07.1997 1212 all checks consistent
04.07.1997 1313 all checks consistent
05.07.1997 1111 all checks consistent
06.07.1997 000 all checks consistent
07.07.1997 3939 all checks consistent
08.07.1997 1212 all checks consistent
09.07.1997 1414 all checks consistent
10.07.1997 1616 all checks consistent
12.07.1997 000 all checks consistent
13.07.1997 000 all checks consistent
14.07.1997 1212 all checks consistent
15.07.1997 000 all checks consistent
17.07.1997 000 all checks consistent
18.07.1997 1111 all checks consistent
19.07.1997 000 all checks consistent
20.07.1997 1212 all checks consistent
21.07.1997 000 all checks consistent
22.07.1997 000 all checks consistent
23.07.1997 21232 all checks consistent
24.07.1997 31141 all checks consistent
25.07.1997 43171 all checks consistent
26.07.1997 31343 all checks consistent
27.07.1997 2626 all checks consistent
29.07.1997 000 all checks consistent
30.07.1997 000 all checks consistent
31.07.1997 000 all checks consistent
01.08.1997 000 all checks consistent
02.08.1997 ——— reading could not be verified
03.08.1997 1818 all checks consistent
04.08.1997 ——— reading could not be verified
05.08.1997 1212 all checks consistent
06.08.1997 31949 all checks consistent
08.08.1997 43171 all checks consistent
09.08.1997 32656 all checks consistent
10.08.1997 21333 counts consistent, some coordinates doubtful
15.08.1997 41050 all checks consistent
16.08.1997 2323 all checks consistent
17.08.1997 2424 all checks consistent
18.08.1997 2424 all checks consistent
19.08.1997 2424 all checks consistent
20.08.1997 ——— reading could not be verified
21.08.1997 1111 all checks consistent
22.08.1997 1111 all checks consistent
23.08.1997 ——— reading could not be verified
25.08.1997 2525 all checks consistent
26.08.1997 21232 all checks consistent
27.08.1997 21838 all checks consistent
28.08.1997 33666 all checks consistent
29.08.1997 14555 all checks consistent
30.08.1997 24666 all checks consistent
31.08.1997 561111 all checks consistent
01.09.1997 32555 all checks consistent
02.09.1997 53787 all checks consistent
04.09.1997 31545 all checks consistent
05.09.1997 33161 all checks consistent
06.09.1997 42969 all checks consistent
07.09.1997 43373 all checks consistent
08.09.1997 ——— reading could not be verified
09.09.1997 45595 all checks consistent
10.09.1997 374104 all checks consistent
11.09.1997 36999 all checks consistent
12.09.1997 36292 all checks consistent
13.09.1997 45292 all checks consistent
14.09.1997 43575 all checks consistent
15.09.1997 34777 all checks consistent
20.09.1997 1414 all checks consistent
21.09.1997 1818 all checks consistent
22.09.1997 32050 all checks consistent
23.09.1997 21535 all checks consistent
24.09.1997 22848 all checks consistent
25.09.1997 33161 all checks consistent
26.09.1997 11727 all checks consistent
27.09.1997 11929 all checks consistent
28.09.1997 11323 all checks consistent
29.09.1997 1515 all checks consistent
30.09.1997 2525 all checks consistent
05.10.1997 2828 all checks consistent
06.10.1997 2424 all checks consistent
07.10.1997 2424 all checks consistent
08.10.1997 11222 all checks consistent
10.10.1997 21030 all checks consistent
11.10.1997 21737 all checks consistent
15.10.1997 21535 all checks consistent
22.10.1997 1111 all checks consistent
24.10.1997 2222 all checks consistent
27.10.1997 1111 all checks consistent
28.10.1997 42666 all checks consistent
01.11.1997 23151 all checks consistent
02.11.1997 32151 all checks consistent
04.11.1997 25777 all checks consistent
05.11.1997 24767 all checks consistent
06.11.1997 22949 all checks consistent
07.11.1997 22242 all checks consistent
08.11.1997 52070 all checks consistent
09.11.1997 2323 all checks consistent
10.11.1997 ——— reading could not be verified
11.11.1997 21737 all checks consistent
12.11.1997 2828 all checks consistent
13.11.1997 3333 all checks consistent
14.11.1997 31848 all checks consistent
17.11.1997 ——— reading could not be verified
19.11.1997 ——— reading could not be verified
23.11.1997 53585 counts consistent, some coordinates doubtful
26.11.1997 ——— reading could not be verified
01.12.1997 24161 all checks consistent
03.12.1997 13343 all checks consistent
05.12.1997 22141 all checks consistent
11.12.1997 52878 all checks consistent
12.12.1997 53080 counts consistent, some coordinates doubtful
13.12.1997 42464 all checks consistent
19.12.1997 1818 all checks consistent
20.12.1997 31141 all checks consistent
22.12.1997 21838 all checks consistent
23.12.1997 43070 all checks consistent
25.12.1997 22242 all checks consistent
26.12.1997 32555 all checks consistent
27.12.1997 32959 all checks consistent
30.12.1997 ——— reading could not be verified
31.12.1997 33060 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.