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 1958 307 sheets · 264 usable · mean R 225.9

DrawingDategfRReading
05.01.1958 ——— reading could not be verified
06.01.1958 ——— reading could not be verified
10.01.1958 1697257 all checks consistent
11.01.1958 18120300 all checks consistent
14.01.1958 17144314 all checks consistent
15.01.1958 18133313 all checks consistent
18.01.1958 2289309 all checks consistent
19.01.1958 2265285 all checks consistent
20.01.1958 1878258 all checks consistent
21.01.1958 1862242 all checks consistent
22.01.1958 1871251 all checks consistent
23.01.1958 1662222 all checks consistent
24.01.1958 1051151 all checks consistent
30.01.1958 1043143 all checks consistent
31.01.1958 ——— reading could not be verified
01.02.1958 1366196 all checks consistent
02.02.1958 1451191 all checks consistent
03.02.1958 1485225 all checks consistent
04.02.1958 1073173 all checks consistent
05.02.1958 1260180 all checks consistent
06.02.1958 1194204 all checks consistent
07.02.1958 12130250 all checks consistent
08.02.1958 12127247 all checks consistent
09.02.1958 1298218 all checks consistent
10.02.1958 1082182 all checks consistent
11.02.1958 1076176 all checks consistent
13.02.1958 1154164 all checks consistent
14.02.1958 ——— reading could not be verified
15.02.1958 1362192 all checks consistent
16.02.1958 1263183 all checks consistent
17.02.1958 1335165 all checks consistent
18.02.1958 1328158 all checks consistent
19.02.1958 915105 all checks consistent
21.02.1958 ——— reading could not be verified
22.02.1958 1494234 all checks consistent
23.02.1958 742112 all checks consistent
24.02.1958 742112 all checks consistent
25.02.1958 1387217 all checks consistent
26.02.1958 1054154 all checks consistent
27.02.1958 ——— reading could not be verified
28.02.1958 937127 all checks consistent
01.03.1958 775145 all checks consistent
02.03.1958 63898 all checks consistent
05.03.1958 12104224 all checks consistent
06.03.1958 11113223 all checks consistent
07.03.1958 868148 all checks consistent
08.03.1958 13178308 all checks consistent
09.03.1958 9133223 all checks consistent
10.03.1958 1094194 all checks consistent
11.03.1958 884164 all checks consistent
12.03.1958 8101181 all checks consistent
13.03.1958 885165 all checks consistent
14.03.1958 9119209 all checks consistent
16.03.1958 13108238 all checks consistent
17.03.1958 ——— reading could not be verified
20.03.1958 ——— reading could not be verified
22.03.1958 1076176 all checks consistent
24.03.1958 12103223 all checks consistent
25.03.1958 1392222 all checks consistent
26.03.1958 11144254 all checks consistent
28.03.1958 14177317 all checks consistent
29.03.1958 17197367 all checks consistent
30.03.1958 ——— reading could not be verified
31.03.1958 13114244 all checks consistent
01.04.1958 16182342 all checks consistent
02.04.1958 ——— reading could not be verified
03.04.1958 18168348 all checks consistent
04.04.1958 17153323 all checks consistent
05.04.1958 17182352 all checks consistent
07.04.1958 18138318 all checks consistent
08.04.1958 18127307 all checks consistent
09.04.1958 13104234 all checks consistent
10.04.1958 1383213 all checks consistent
11.04.1958 14108248 all checks consistent
12.04.1958 1463203 all checks consistent
13.04.1958 1548198 all checks consistent
14.04.1958 1227147 all checks consistent
15.04.1958 1344174 all checks consistent
16.04.1958 72797 all checks consistent
17.04.1958 1159169 all checks consistent
18.04.1958 ——— reading could not be verified
19.04.1958 ——— reading could not be verified
20.04.1958 1087187 all checks consistent
21.04.1958 12114234 all checks consistent
22.04.1958 14152292 all checks consistent
23.04.1958 1473213 all checks consistent
25.04.1958 1157167 all checks consistent
26.04.1958 15108258 all checks consistent
27.04.1958 1268188 all checks consistent
28.04.1958 1386216 all checks consistent
29.04.1958 13149279 all checks consistent
01.05.1958 12177297 all checks consistent
02.05.1958 ——— reading could not be verified
03.05.1958 17169339 all checks consistent
04.05.1958 16146306 all checks consistent
05.05.1958 18183363 all checks consistent
06.05.1958 17135305 all checks consistent
07.05.1958 ——— reading could not be verified
08.05.1958 1088188 all checks consistent
09.05.1958 1178188 all checks consistent
10.05.1958 1790260 all checks consistent
11.05.1958 1086186 all checks consistent
12.05.1958 1593243 all checks consistent
13.05.1958 14105245 all checks consistent
14.05.1958 ——— reading could not be verified
15.05.1958 758128 all checks consistent
16.05.1958 990180 all checks consistent
17.05.1958 886166 all checks consistent
18.05.1958 871151 all checks consistent
19.05.1958 ——— reading could not be verified
20.05.1958 1059159 all checks consistent
21.05.1958 1241161 all checks consistent
22.05.1958 1575225 all checks consistent
23.05.1958 1382212 all checks consistent
24.05.1958 1689249 all checks consistent
25.05.1958 1680240 all checks consistent
26.05.1958 1571221 all checks consistent
27.05.1958 1663223 all checks consistent
29.05.1958 1241161 all checks consistent
30.05.1958 18132312 all checks consistent
31.05.1958 1793263 all checks consistent
01.06.1958 13101231 all checks consistent
02.06.1958 1061161 all checks consistent
03.06.1958 1774244 all checks consistent
04.06.1958 1574224 all checks consistent
05.06.1958 ——— reading could not be verified
06.06.1958 ——— reading could not be verified
08.06.1958 12111231 all checks consistent
09.06.1958 ——— reading could not be verified
10.06.1958 11130240 all checks consistent
12.06.1958 ——— reading could not be verified
13.06.1958 12133253 all checks consistent
14.06.1958 1188198 all checks consistent
16.06.1958 844124 all checks consistent
17.06.1958 54595 all checks consistent
18.06.1958 945135 all checks consistent
19.06.1958 861141 all checks consistent
20.06.1958 ——— reading could not be verified
21.06.1958 878158 all checks consistent
22.06.1958 1090190 all checks consistent
23.06.1958 15101251 all checks consistent
24.06.1958 16125285 all checks consistent
25.06.1958 14119259 all checks consistent
26.06.1958 ——— reading could not be verified
27.06.1958 ——— reading could not be verified
28.06.1958 11121231 all checks consistent
29.06.1958 1680240 all checks consistent
30.06.1958 1389219 all checks consistent
01.07.1958 11101211 all checks consistent
02.07.1958 1181191 all checks consistent
03.07.1958 14156296 all checks consistent
04.07.1958 ——— reading could not be verified
05.07.1958 11167277 all checks consistent
06.07.1958 12165285 all checks consistent
07.07.1958 16158318 all checks consistent
08.07.1958 12110230 all checks consistent
09.07.1958 1088188 all checks consistent
10.07.1958 10124224 all checks consistent
11.07.1958 1094194 all checks consistent
12.07.1958 1197207 all checks consistent
13.07.1958 1160170 all checks consistent
14.07.1958 1360190 all checks consistent
15.07.1958 1059159 all checks consistent
16.07.1958 1254174 all checks consistent
17.07.1958 1082182 all checks consistent
18.07.1958 1086186 all checks consistent
19.07.1958 ——— reading could not be verified
20.07.1958 1594244 all checks consistent
21.07.1958 18112292 all checks consistent
22.07.1958 17102272 all checks consistent
23.07.1958 1376206 all checks consistent
24.07.1958 13130260 all checks consistent
25.07.1958 12129249 all checks consistent
26.07.1958 9130220 all checks consistent
27.07.1958 12182302 all checks consistent
28.07.1958 13181311 all checks consistent
29.07.1958 13189319 all checks consistent
30.07.1958 14149289 all checks consistent
31.07.1958 17244414 all checks consistent
01.08.1958 ——— reading could not be verified
02.08.1958 15174324 all checks consistent
03.08.1958 15128278 all checks consistent
04.08.1958 16119279 all checks consistent
05.08.1958 18114294 all checks consistent
06.08.1958 ——— reading could not be verified
07.08.1958 19126316 all checks consistent
08.08.1958 14104244 all checks consistent
09.08.1958 16126286 all checks consistent
10.08.1958 14156296 all checks consistent
11.08.1958 16223383 all checks consistent
12.08.1958 15191341 all checks consistent
13.08.1958 12140260 all checks consistent
14.08.1958 11150260 all checks consistent
15.08.1958 8132212 all checks consistent
16.08.1958 ——— reading could not be verified
17.08.1958 1190200 all checks consistent
18.08.1958 16113273 all checks consistent
19.08.1958 1191201 all checks consistent
20.08.1958 858138 all checks consistent
21.08.1958 1298218 all checks consistent
22.08.1958 10158258 all checks consistent
23.08.1958 12153273 all checks consistent
24.08.1958 10151251 all checks consistent
25.08.1958 11114224 all checks consistent
26.08.1958 11111221 all checks consistent
27.08.1958 758128 all checks consistent
28.08.1958 1796266 all checks consistent
29.08.1958 14123263 all checks consistent
30.08.1958 15138288 all checks consistent
31.08.1958 10125225 all checks consistent
01.09.1958 13174304 all checks consistent
02.09.1958 11158268 all checks consistent
03.09.1958 16125285 all checks consistent
05.09.1958 ——— reading could not be verified
08.09.1958 11126236 all checks consistent
09.09.1958 9119209 all checks consistent
11.09.1958 ——— reading could not be verified
12.09.1958 ——— reading could not be verified
13.09.1958 18176356 all checks consistent
14.09.1958 12143263 all checks consistent
16.09.1958 14134274 all checks consistent
17.09.1958 16149309 all checks consistent
18.09.1958 15160310 all checks consistent
19.09.1958 ——— reading could not be verified
20.09.1958 1089189 all checks consistent
21.09.1958 ——— reading could not be verified
22.09.1958 11108218 all checks consistent
23.09.1958 1187197 all checks consistent
24.09.1958 12107227 all checks consistent
25.09.1958 1289209 all checks consistent
26.09.1958 12111231 all checks consistent
27.09.1958 12122242 all checks consistent
28.09.1958 12154274 all checks consistent
29.09.1958 19139329 all checks consistent
30.09.1958 16104264 all checks consistent
01.10.1958 1685245 all checks consistent
02.10.1958 ——— reading could not be verified
03.10.1958 ——— reading could not be verified
04.10.1958 1271191 all checks consistent
05.10.1958 1585235 all checks consistent
06.10.1958 1171181 all checks consistent
07.10.1958 967157 all checks consistent
09.10.1958 ——— reading could not be verified
10.10.1958 744114 all checks consistent
11.10.1958 1145155 all checks consistent
13.10.1958 1076176 all checks consistent
14.10.1958 1178188 all checks consistent
15.10.1958 1069169 all checks consistent
16.10.1958 14140280 all checks consistent
17.10.1958 16150310 all checks consistent
18.10.1958 12135255 all checks consistent
21.10.1958 15130280 all checks consistent
22.10.1958 15151301 all checks consistent
23.10.1958 18138318 all checks consistent
24.10.1958 ——— reading could not be verified
25.10.1958 14115255 all checks consistent
26.10.1958 1394224 all checks consistent
27.10.1958 1185195 all checks consistent
28.10.1958 ——— reading could not be verified
29.10.1958 1676236 all checks consistent
30.10.1958 15131281 all checks consistent
31.10.1958 16169329 all checks consistent
01.11.1958 ——— reading could not be verified
02.11.1958 11176286 all checks consistent
03.11.1958 12106226 all checks consistent
04.11.1958 1589239 all checks consistent
05.11.1958 1183193 all checks consistent
06.11.1958 1078178 all checks consistent
07.11.1958 762132 all checks consistent
08.11.1958 1045145 all checks consistent
09.11.1958 823103 all checks consistent
10.11.1958 919109 all checks consistent
11.11.1958 71888 all checks consistent
13.11.1958 829109 all checks consistent
14.11.1958 730100 all checks consistent
15.11.1958 826106 all checks consistent
16.11.1958 934124 all checks consistent
20.11.1958 832112 all checks consistent
21.11.1958 754124 all checks consistent
22.11.1958 967157 all checks consistent
23.11.1958 848128 all checks consistent
25.11.1958 16147307 all checks consistent
26.11.1958 13146276 all checks consistent
28.11.1958 17144314 all checks consistent
29.11.1958 19183373 all checks consistent
30.11.1958 16188348 all checks consistent
01.12.1958 15145295 all checks consistent
04.12.1958 1497237 all checks consistent
09.12.1958 14134274 all checks consistent
10.12.1958 15183333 all checks consistent
11.12.1958 14159299 all checks consistent
12.12.1958 ——— reading could not be verified
14.12.1958 9110200 all checks consistent
15.12.1958 775145 all checks consistent
16.12.1958 ——— reading could not be verified
17.12.1958 ——— reading could not be verified
18.12.1958 53686 all checks consistent
19.12.1958 552102 all checks consistent
20.12.1958 656116 all checks consistent
22.12.1958 1042142 all checks consistent
23.12.1958 1060160 all checks consistent
24.12.1958 9110200 all checks consistent
25.12.1958 10102202 all checks consistent
26.12.1958 13164294 all checks consistent
28.12.1958 ——— reading could not be verified
30.12.1958 1185195 all checks consistent
31.12.1958 12118238 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.