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 1956 299 sheets · 270 usable · mean R 163.3

DrawingDategfRReading
03.01.1956 31242 all checks consistent
04.01.1956 52676 all checks consistent
05.01.1956 51767 all checks consistent
07.01.1956 ——— reading could not be verified
08.01.1956 62282 all checks consistent
09.01.1956 5959 all checks consistent
10.01.1956 31141 all checks consistent
11.01.1956 33969 all checks consistent
12.01.1956 44282 all checks consistent
13.01.1956 741111 all checks consistent
14.01.1956 740110 all checks consistent
16.01.1956 881161 all checks consistent
17.01.1956 980170 all checks consistent
18.01.1956 6139199 all checks consistent
19.01.1956 689149 all checks consistent
22.01.1956 289109 all checks consistent
23.01.1956 696156 all checks consistent
24.01.1956 54696 all checks consistent
25.01.1956 666126 all checks consistent
28.01.1956 52575 all checks consistent
30.01.1956 51565 all checks consistent
07.02.1956 31444 all checks consistent
09.02.1956 52474 all checks consistent
10.02.1956 4848 all checks consistent
13.02.1956 644104 all checks consistent
15.02.1956 9135225 all checks consistent
16.02.1956 7144214 all checks consistent
19.02.1956 8167247 all checks consistent
20.02.1956 7188258 all checks consistent
23.02.1956 981171 all checks consistent
24.02.1956 1183193 all checks consistent
26.02.1956 1257177 all checks consistent
28.02.1956 1352182 all checks consistent
01.03.1956 1082182 all checks consistent
03.03.1956 862142 all checks consistent
04.03.1956 ——— reading could not be verified
05.03.1956 795165 all checks consistent
07.03.1956 672132 all checks consistent
08.03.1956 668128 all checks consistent
12.03.1956 833113 all checks consistent
14.03.1956 ——— reading could not be verified
17.03.1956 563113 all checks consistent
20.03.1956 1143153 all checks consistent
21.03.1956 ——— reading could not be verified
23.03.1956 1057157 all checks consistent
24.03.1956 952142 all checks consistent
25.03.1956 938128 all checks consistent
26.03.1956 1045145 all checks consistent
27.03.1956 845125 all checks consistent
28.03.1956 1068168 all checks consistent
29.03.1956 883163 all checks consistent
30.03.1956 652112 all checks consistent
31.03.1956 1045145 all checks consistent
01.04.1956 744114 all checks consistent
02.04.1956 42161 all checks consistent
04.04.1956 51060 all checks consistent
05.04.1956 62181 all checks consistent
06.04.1956 ——— reading could not be verified
07.04.1956 33565 all checks consistent
09.04.1956 737107 all checks consistent
10.04.1956 1282202 all checks consistent
11.04.1956 1271191 all checks consistent
12.04.1956 14103243 all checks consistent
13.04.1956 1376206 all checks consistent
14.04.1956 1289209 all checks consistent
15.04.1956 1187197 all checks consistent
16.04.1956 15115265 all checks consistent
17.04.1956 1798268 all checks consistent
18.04.1956 1861241 all checks consistent
19.04.1956 1669229 all checks consistent
20.04.1956 ——— reading could not be verified
22.04.1956 1383213 all checks consistent
23.04.1956 53787 all checks consistent
24.04.1956 648108 all checks consistent
26.04.1956 53282 all checks consistent
27.04.1956 751121 all checks consistent
29.04.1956 3737 all checks consistent
30.04.1956 63393 all checks consistent
01.05.1956 746116 all checks consistent
02.05.1956 838118 all checks consistent
03.05.1956 1059159 all checks consistent
04.05.1956 1244164 all checks consistent
05.05.1956 1065165 all checks consistent
06.05.1956 964154 all checks consistent
07.05.1956 11111221 all checks consistent
08.05.1956 1382212 all checks consistent
09.05.1956 1558208 all checks consistent
10.05.1956 1491231 all checks consistent
11.05.1956 1560210 all checks consistent
12.05.1956 1081181 all checks consistent
13.05.1956 873153 all checks consistent
14.05.1956 ——— reading could not be verified
15.05.1956 ——— reading could not be verified
16.05.1956 943133 all checks consistent
17.05.1956 1047147 all checks consistent
18.05.1956 ——— reading could not be verified
19.05.1956 1161171 all checks consistent
20.05.1956 1048148 all checks consistent
21.05.1956 11139249 all checks consistent
22.05.1956 751121 all checks consistent
23.05.1956 741111 all checks consistent
24.05.1956 752122 all checks consistent
25.05.1956 54595 all checks consistent
26.05.1956 657117 all checks consistent
27.05.1956 682142 all checks consistent
28.05.1956 872152 all checks consistent
29.05.1956 755125 all checks consistent
30.05.1956 861141 all checks consistent
31.05.1956 970160 all checks consistent
01.06.1956 ——— reading could not be verified
02.06.1956 664124 all checks consistent
03.06.1956 ——— reading could not be verified
04.06.1956 769139 all checks consistent
05.06.1956 959149 all checks consistent
06.06.1956 933123 all checks consistent
07.06.1956 ——— reading could not be verified
08.06.1956 ——— reading could not be verified
09.06.1956 62484 all checks consistent
10.06.1956 732102 all checks consistent
11.06.1956 ——— reading could not be verified
12.06.1956 939129 all checks consistent
13.06.1956 62585 all checks consistent
14.06.1956 835115 all checks consistent
15.06.1956 947137 all checks consistent
16.06.1956 1070170 all checks consistent
17.06.1956 655115 all checks consistent
18.06.1956 889169 all checks consistent
19.06.1956 895175 all checks consistent
20.06.1956 6115175 all checks consistent
21.06.1956 9113203 all checks consistent
22.06.1956 ——— reading could not be verified
23.06.1956 1091191 all checks consistent
24.06.1956 655115 all checks consistent
25.06.1956 773143 all checks consistent
26.06.1956 ——— reading could not be verified
27.06.1956 42767 all checks consistent
28.06.1956 964154 all checks consistent
29.06.1956 1058158 all checks consistent
30.06.1956 1283203 all checks consistent
01.07.1956 10126226 all checks consistent
02.07.1956 12107227 all checks consistent
03.07.1956 1091191 all checks consistent
04.07.1956 1359189 all checks consistent
05.07.1956 1366196 all checks consistent
06.07.1956 1150160 all checks consistent
07.07.1956 11120230 all checks consistent
08.07.1956 1266186 all checks consistent
09.07.1956 1262182 all checks consistent
10.07.1956 1090190 all checks consistent
11.07.1956 1276196 all checks consistent
12.07.1956 12165285 all checks consistent
13.07.1956 1163173 all checks consistent
14.07.1956 1390220 all checks consistent
15.07.1956 1036136 all checks consistent
16.07.1956 1441181 all checks consistent
17.07.1956 828108 all checks consistent
18.07.1956 52272 all checks consistent
19.07.1956 45090 all checks consistent
20.07.1956 44484 all checks consistent
21.07.1956 53080 all checks consistent
22.07.1956 554104 all checks consistent
23.07.1956 971161 all checks consistent
24.07.1956 44282 all checks consistent
25.07.1956 54898 all checks consistent
26.07.1956 569119 all checks consistent
27.07.1956 54393 all checks consistent
28.07.1956 647107 all checks consistent
29.07.1956 1056156 all checks consistent
30.07.1956 1248168 all checks consistent
31.07.1956 1052152 all checks consistent
01.08.1956 947137 all checks consistent
02.08.1956 ——— reading could not be verified
03.08.1956 1270190 all checks consistent
04.08.1956 1263183 all checks consistent
05.08.1956 1057157 all checks consistent
06.08.1956 1073173 all checks consistent
07.08.1956 994184 all checks consistent
08.08.1956 54898 all checks consistent
09.08.1956 ——— reading could not be verified
10.08.1956 987177 all checks consistent
11.08.1956 ——— reading could not be verified
12.08.1956 8130210 all checks consistent
13.08.1956 761131 all checks consistent
14.08.1956 7113183 all checks consistent
15.08.1956 552102 all checks consistent
16.08.1956 956146 all checks consistent
17.08.1956 951141 all checks consistent
18.08.1956 1377207 all checks consistent
19.08.1956 13115245 all checks consistent
20.08.1956 13100230 all checks consistent
21.08.1956 ——— reading could not be verified
22.08.1956 ——— reading could not be verified
23.08.1956 ——— reading could not be verified
24.08.1956 12183303 all checks consistent
25.08.1956 1091191 all checks consistent
26.08.1956 ——— reading could not be verified
27.08.1956 1597247 all checks consistent
28.08.1956 14119259 all checks consistent
29.08.1956 12117237 all checks consistent
30.08.1956 12156276 all checks consistent
31.08.1956 11148258 all checks consistent
01.09.1956 10132232 all checks consistent
02.09.1956 10122222 all checks consistent
03.09.1956 882162 all checks consistent
04.09.1956 965155 all checks consistent
05.09.1956 1065165 all checks consistent
06.09.1956 ——— reading could not be verified
07.09.1956 1696256 all checks consistent
08.09.1956 959149 all checks consistent
09.09.1956 570120 all checks consistent
10.09.1956 590140 all checks consistent
11.09.1956 6115175 all checks consistent
12.09.1956 9132222 all checks consistent
13.09.1956 16175335 all checks consistent
14.09.1956 14125265 all checks consistent
15.09.1956 16104264 all checks consistent
16.09.1956 18112292 all checks consistent
17.09.1956 1377207 all checks consistent
18.09.1956 13100230 all checks consistent
19.09.1956 1380210 all checks consistent
20.09.1956 1669229 all checks consistent
21.09.1956 1661221 all checks consistent
22.09.1956 1631191 all checks consistent
23.09.1956 1451191 all checks consistent
24.09.1956 1031131 all checks consistent
25.09.1956 1056156 all checks consistent
26.09.1956 1145155 all checks consistent
27.09.1956 ——— reading could not be verified
28.09.1956 1038138 all checks consistent
29.09.1956 836116 all checks consistent
30.09.1956 941131 all checks consistent
01.10.1956 1149159 all checks consistent
02.10.1956 979169 all checks consistent
03.10.1956 1180190 all checks consistent
04.10.1956 11116226 all checks consistent
05.10.1956 ——— reading could not be verified
06.10.1956 9106196 all checks consistent
08.10.1956 889169 all checks consistent
09.10.1956 9114204 all checks consistent
10.10.1956 1096196 all checks consistent
12.10.1956 836116 all checks consistent
13.10.1956 948138 all checks consistent
14.10.1956 929119 all checks consistent
15.10.1956 831111 all checks consistent
16.10.1956 832112 all checks consistent
17.10.1956 63090 all checks consistent
18.10.1956 927117 all checks consistent
19.10.1956 750120 all checks consistent
20.10.1956 756126 all checks consistent
21.10.1956 868148 all checks consistent
22.10.1956 952142 all checks consistent
23.10.1956 949139 all checks consistent
24.10.1956 845125 all checks consistent
25.10.1956 960150 all checks consistent
26.10.1956 776146 all checks consistent
27.10.1956 651111 all checks consistent
28.10.1956 747117 all checks consistent
29.10.1956 1451191 all checks consistent
30.10.1956 1070170 all checks consistent
31.10.1956 955145 all checks consistent
02.11.1956 1377207 all checks consistent
05.11.1956 13129259 all checks consistent
07.11.1956 15156306 all checks consistent
09.11.1956 10173273 all checks consistent
10.11.1956 12102222 all checks consistent
11.11.1956 13138268 all checks consistent
12.11.1956 13194324 all checks consistent
13.11.1956 10113213 all checks consistent
14.11.1956 9114204 all checks consistent
15.11.1956 11146256 all checks consistent
16.11.1956 13138268 all checks consistent
18.11.1956 11109219 all checks consistent
22.11.1956 647107 all checks consistent
24.11.1956 559109 all checks consistent
26.11.1956 8111191 all checks consistent
27.11.1956 774144 all checks consistent
28.11.1956 1165175 all checks consistent
29.11.1956 1461201 all checks consistent
01.12.1956 ——— reading could not be verified
03.12.1956 19141331 all checks consistent
06.12.1956 1073173 all checks consistent
08.12.1956 766136 all checks consistent
09.12.1956 1060160 all checks consistent
10.12.1956 12106226 all checks consistent
11.12.1956 10123223 all checks consistent
13.12.1956 1164174 all checks consistent
15.12.1956 1566216 all checks consistent
16.12.1956 1084184 all checks consistent
17.12.1956 11126236 all checks consistent
18.12.1956 ——— reading could not be verified
19.12.1956 1071171 all checks consistent
21.12.1956 844124 all checks consistent
22.12.1956 ——— reading could not be verified
23.12.1956 10149249 all checks consistent
24.12.1956 996186 all checks consistent
25.12.1956 1094194 all checks consistent
27.12.1956 846126 all checks consistent
29.12.1956 1344174 all checks consistent
31.12.1956 1581231 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.