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 1957 299 sheets · 262 usable · mean R 196.0

DrawingDategfRReading
01.01.1957 971161 all checks consistent
02.01.1957 ——— reading could not be verified
04.01.1957 1287207 all checks consistent
05.01.1957 17108278 all checks consistent
06.01.1957 ——— reading could not be verified
08.01.1957 1090190 all checks consistent
09.01.1957 ——— reading could not be verified
10.01.1957 961151 all checks consistent
11.01.1957 1072172 all checks consistent
14.01.1957 ——— reading could not be verified
15.01.1957 71989 all checks consistent
16.01.1957 62181 all checks consistent
21.01.1957 1276196 all checks consistent
22.01.1957 1672232 all checks consistent
23.01.1957 1372202 all checks consistent
24.01.1957 1186196 all checks consistent
25.01.1957 14108248 all checks consistent
26.01.1957 1163173 all checks consistent
30.01.1957 927117 all checks consistent
31.01.1957 1020120 all checks consistent
02.02.1957 51767 all checks consistent
03.02.1957 81797 all checks consistent
04.02.1957 1232152 all checks consistent
05.02.1957 734104 all checks consistent
06.02.1957 946136 all checks consistent
08.02.1957 1070170 all checks consistent
09.02.1957 1179189 all checks consistent
10.02.1957 ——— reading could not be verified
11.02.1957 1060160 all checks consistent
12.02.1957 1059159 all checks consistent
13.02.1957 1024124 all checks consistent
14.02.1957 1126136 all checks consistent
15.02.1957 1237157 all checks consistent
16.02.1957 1349179 all checks consistent
17.02.1957 936126 all checks consistent
18.02.1957 8103183 all checks consistent
19.02.1957 741111 all checks consistent
20.02.1957 948138 all checks consistent
22.02.1957 852132 all checks consistent
23.02.1957 750120 all checks consistent
25.02.1957 1062162 all checks consistent
26.02.1957 851131 all checks consistent
27.02.1957 948138 all checks consistent
28.02.1957 731101 all checks consistent
04.03.1957 935125 all checks consistent
05.03.1957 1058158 all checks consistent
06.03.1957 1138148 all checks consistent
07.03.1957 1257177 all checks consistent
10.03.1957 1386216 all checks consistent
13.03.1957 1164174 all checks consistent
14.03.1957 1265185 all checks consistent
15.03.1957 1051151 all checks consistent
16.03.1957 ——— reading could not be verified
18.03.1957 954144 all checks consistent
20.03.1957 852132 all checks consistent
21.03.1957 ——— reading could not be verified
22.03.1957 828108 all checks consistent
23.03.1957 11114224 all checks consistent
24.03.1957 53484 all checks consistent
26.03.1957 749119 all checks consistent
27.03.1957 1033133 all checks consistent
28.03.1957 1170180 all checks consistent
29.03.1957 838118 all checks consistent
30.03.1957 1243163 all checks consistent
31.03.1957 1166176 all checks consistent
01.04.1957 952142 all checks consistent
02.04.1957 863143 all checks consistent
03.04.1957 1047147 all checks consistent
04.04.1957 1257177 all checks consistent
05.04.1957 71686 all checks consistent
06.04.1957 947137 all checks consistent
07.04.1957 937127 all checks consistent
08.04.1957 884164 all checks consistent
09.04.1957 1077177 all checks consistent
10.04.1957 863143 all checks consistent
11.04.1957 842122 all checks consistent
12.04.1957 764134 all checks consistent
13.04.1957 841121 all checks consistent
14.04.1957 749119 all checks consistent
15.04.1957 742112 all checks consistent
20.04.1957 1161171 all checks consistent
24.04.1957 1471211 all checks consistent
25.04.1957 1377207 all checks consistent
28.04.1957 1155165 all checks consistent
29.04.1957 1581231 all checks consistent
30.04.1957 1240160 all checks consistent
01.05.1957 942132 all checks consistent
02.05.1957 926116 all checks consistent
03.05.1957 1027127 all checks consistent
04.05.1957 842122 all checks consistent
06.05.1957 873153 all checks consistent
07.05.1957 891171 all checks consistent
08.05.1957 775145 all checks consistent
09.05.1957 ——— reading could not be verified
10.05.1957 890170 all checks consistent
11.05.1957 8138218 all checks consistent
12.05.1957 ——— reading could not be verified
13.05.1957 888168 all checks consistent
14.05.1957 11100210 all checks consistent
16.05.1957 1280200 all checks consistent
17.05.1957 1354184 all checks consistent
18.05.1957 1277197 all checks consistent
19.05.1957 1693253 all checks consistent
20.05.1957 ——— reading could not be verified
21.05.1957 17105275 all checks consistent
22.05.1957 1289209 all checks consistent
23.05.1957 1162172 all checks consistent
24.05.1957 1471211 all checks consistent
25.05.1957 753123 all checks consistent
27.05.1957 1134144 all checks consistent
28.05.1957 ——— reading could not be verified
29.05.1957 ——— reading could not be verified
30.05.1957 1163173 all checks consistent
31.05.1957 731101 all checks consistent
01.06.1957 1070170 all checks consistent
02.06.1957 1178188 all checks consistent
03.06.1957 13126256 all checks consistent
04.06.1957 10128228 all checks consistent
05.06.1957 880160 all checks consistent
06.06.1957 972162 all checks consistent
07.06.1957 1072172 all checks consistent
08.06.1957 939129 all checks consistent
09.06.1957 1151161 all checks consistent
10.06.1957 1083183 all checks consistent
11.06.1957 1070170 all checks consistent
12.06.1957 ——— reading could not be verified
13.06.1957 1181191 all checks consistent
14.06.1957 840120 all checks consistent
15.06.1957 881161 all checks consistent
16.06.1957 11141251 all checks consistent
17.06.1957 ——— reading could not be verified
18.06.1957 17147317 all checks consistent
19.06.1957 14121261 all checks consistent
20.06.1957 15132282 all checks consistent
21.06.1957 ——— reading could not be verified
22.06.1957 11111221 all checks consistent
23.06.1957 12107227 all checks consistent
24.06.1957 11185295 all checks consistent
25.06.1957 10133233 all checks consistent
26.06.1957 1187197 all checks consistent
27.06.1957 1080180 all checks consistent
29.06.1957 1145155 all checks consistent
30.06.1957 1292212 all checks consistent
01.07.1957 1186196 all checks consistent
02.07.1957 1366196 all checks consistent
03.07.1957 1299219 all checks consistent
04.07.1957 13134264 all checks consistent
05.07.1957 13138268 all checks consistent
06.07.1957 17103273 all checks consistent
07.07.1957 1167177 all checks consistent
08.07.1957 1056156 all checks consistent
09.07.1957 1154164 all checks consistent
10.07.1957 937127 all checks consistent
11.07.1957 1020120 all checks consistent
12.07.1957 52474 all checks consistent
13.07.1957 72090 all checks consistent
14.07.1957 1034134 all checks consistent
15.07.1957 ——— reading could not be verified
16.07.1957 ——— reading could not be verified
17.07.1957 1185195 all checks consistent
18.07.1957 1497237 all checks consistent
19.07.1957 15104254 all checks consistent
20.07.1957 ——— reading could not be verified
21.07.1957 17142312 all checks consistent
22.07.1957 18228408 all checks consistent
23.07.1957 18157337 all checks consistent
24.07.1957 11118228 all checks consistent
25.07.1957 ——— reading could not be verified
26.07.1957 10117217 all checks consistent
27.07.1957 988178 all checks consistent
28.07.1957 ——— reading could not be verified
29.07.1957 1073173 all checks consistent
30.07.1957 960150 all checks consistent
31.07.1957 657117 all checks consistent
01.08.1957 661121 all checks consistent
02.08.1957 765135 all checks consistent
03.08.1957 ——— reading could not be verified
04.08.1957 9104194 all checks consistent
05.08.1957 1087187 all checks consistent
06.08.1957 1199209 all checks consistent
07.08.1957 ——— reading could not be verified
08.08.1957 1056156 all checks consistent
09.08.1957 938128 all checks consistent
10.08.1957 ——— reading could not be verified
11.08.1957 846126 all checks consistent
12.08.1957 836116 all checks consistent
13.08.1957 936126 all checks consistent
14.08.1957 ——— reading could not be verified
15.08.1957 ——— reading could not be verified
16.08.1957 1460200 all checks consistent
17.08.1957 1461201 all checks consistent
18.08.1957 ——— reading could not be verified
19.08.1957 15110260 all checks consistent
20.08.1957 863143 all checks consistent
21.08.1957 856136 all checks consistent
22.08.1957 63696 all checks consistent
23.08.1957 645105 all checks consistent
24.08.1957 652112 all checks consistent
25.08.1957 1147157 all checks consistent
26.08.1957 ——— reading could not be verified
27.08.1957 1157167 all checks consistent
28.08.1957 ——— reading could not be verified
29.08.1957 11107217 all checks consistent
30.08.1957 ——— reading could not be verified
31.08.1957 ——— reading could not be verified
01.09.1957 7151221 all checks consistent
02.09.1957 7144214 all checks consistent
03.09.1957 ——— reading could not be verified
04.09.1957 782152 all checks consistent
05.09.1957 8109189 all checks consistent
06.09.1957 839119 all checks consistent
07.09.1957 44282 all checks consistent
08.09.1957 9103193 all checks consistent
09.09.1957 664124 all checks consistent
10.09.1957 7154224 all checks consistent
11.09.1957 8120200 all checks consistent
12.09.1957 12151271 all checks consistent
13.09.1957 1396226 all checks consistent
14.09.1957 14124264 all checks consistent
15.09.1957 13118248 all checks consistent
16.09.1957 1188198 all checks consistent
17.09.1957 ——— reading could not be verified
18.09.1957 14163303 all checks consistent
19.09.1957 ——— reading could not be verified
20.09.1957 11132242 all checks consistent
21.09.1957 14136276 all checks consistent
22.09.1957 14165305 all checks consistent
23.09.1957 1194204 all checks consistent
24.09.1957 14178318 all checks consistent
25.09.1957 14118258 all checks consistent
26.09.1957 13108238 all checks consistent
27.09.1957 12109229 all checks consistent
28.09.1957 12124244 all checks consistent
29.09.1957 12150270 all checks consistent
30.09.1957 13116246 all checks consistent
01.10.1957 17163333 all checks consistent
02.10.1957 15114264 all checks consistent
03.10.1957 17119289 all checks consistent
04.10.1957 15110260 all checks consistent
07.10.1957 13102232 all checks consistent
08.10.1957 16124284 all checks consistent
09.10.1957 15117267 all checks consistent
10.10.1957 16158318 all checks consistent
11.10.1957 1181191 all checks consistent
12.10.1957 ——— reading could not be verified
13.10.1957 15122272 all checks consistent
14.10.1957 13127257 all checks consistent
15.10.1957 13167297 all checks consistent
16.10.1957 14105245 all checks consistent
17.10.1957 13121251 all checks consistent
18.10.1957 11104214 all checks consistent
19.10.1957 1095195 all checks consistent
20.10.1957 14136276 all checks consistent
22.10.1957 13137267 all checks consistent
23.10.1957 17144314 all checks consistent
24.10.1957 18126306 all checks consistent
25.10.1957 15146296 all checks consistent
27.10.1957 19188378 all checks consistent
28.10.1957 20196396 all checks consistent
29.10.1957 ——— reading could not be verified
30.10.1957 21147357 all checks consistent
31.10.1957 19137327 all checks consistent
01.11.1957 15111261 all checks consistent
02.11.1957 15125275 all checks consistent
03.11.1957 18135315 all checks consistent
04.11.1957 18100280 all checks consistent
06.11.1957 1542192 all checks consistent
07.11.1957 1752222 all checks consistent
08.11.1957 1561211 all checks consistent
09.11.1957 1991281 all checks consistent
10.11.1957 2094294 all checks consistent
11.11.1957 1673233 all checks consistent
12.11.1957 16108268 all checks consistent
14.11.1957 1398228 all checks consistent
18.11.1957 964154 all checks consistent
19.11.1957 971161 all checks consistent
21.11.1957 1297217 all checks consistent
22.11.1957 15138288 all checks consistent
23.11.1957 13129259 all checks consistent
26.11.1957 1392222 all checks consistent
27.11.1957 1368198 all checks consistent
29.11.1957 14102242 all checks consistent
03.12.1957 1596246 all checks consistent
08.12.1957 ——— reading could not be verified
09.12.1957 1051151 all checks consistent
11.12.1957 1044144 all checks consistent
12.12.1957 1347177 all checks consistent
13.12.1957 1050150 all checks consistent
14.12.1957 1155165 all checks consistent
15.12.1957 951141 all checks consistent
16.12.1957 1376206 all checks consistent
23.12.1957 19171361 all checks consistent
24.12.1957 18167347 all checks consistent
25.12.1957 18103283 all checks consistent
26.12.1957 20150350 all checks consistent
27.12.1957 ——— reading could not be verified
28.12.1957 1587237 all checks consistent
29.12.1957 17124294 all checks consistent
31.12.1957 1675235 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.