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 1970 291 sheets · 262 usable · mean R 148.5

DrawingDategfRReading
02.01.1970 63494 all checks consistent
03.01.1970 43676 counts consistent, some coordinates doubtful
04.01.1970 63595 all checks consistent
05.01.1970 653113 all checks consistent
06.01.1970 ——— reading could not be verified
07.01.1970 2828 all checks consistent
10.01.1970 63696 all checks consistent
11.01.1970 934124 all checks consistent
14.01.1970 971161 all checks consistent
15.01.1970 1467207 all checks consistent
16.01.1970 1284204 all checks consistent
17.01.1970 ——— reading could not be verified
18.01.1970 1491231 all checks consistent
25.01.1970 951141 all checks consistent
26.01.1970 891171 all checks consistent
27.01.1970 1194204 all checks consistent
28.01.1970 10120220 counts consistent, some coordinates doubtful
30.01.1970 979169 all checks consistent
02.02.1970 933123 all checks consistent
05.02.1970 51464 all checks consistent
06.02.1970 821101 all checks consistent
07.02.1970 739109 all checks consistent
10.02.1970 1095195 all checks consistent
12.02.1970 8111191 all checks consistent
13.02.1970 762132 counts consistent, some coordinates doubtful
14.02.1970 ——— reading could not be verified
15.02.1970 660120 all checks consistent
16.02.1970 850130 all checks consistent
17.02.1970 1199209 all checks consistent
18.02.1970 848128 all checks consistent
19.02.1970 8131211 all checks consistent
23.02.1970 14130270 all checks consistent
25.02.1970 768138 all checks consistent
26.02.1970 1184194 all checks consistent
02.03.1970 855135 counts consistent, some coordinates doubtful
03.03.1970 764134 all checks consistent
04.03.1970 838118 all checks consistent
05.03.1970 850130 all checks consistent
07.03.1970 835115 all checks consistent
11.03.1970 1075175 all checks consistent
12.03.1970 657117 counts consistent, some coordinates doubtful
13.03.1970 832112 all checks consistent
15.03.1970 ——— reading could not be verified
16.03.1970 4545 all checks consistent
18.03.1970 4949 all checks consistent
19.03.1970 61575 all checks consistent
20.03.1970 72797 all checks consistent
22.03.1970 760130 all checks consistent
23.03.1970 987177 all checks consistent
24.03.1970 10100200 all checks consistent
25.03.1970 11109219 all checks consistent
26.03.1970 1069169 all checks consistent
27.03.1970 741111 all checks consistent
28.03.1970 829109 all checks consistent
29.03.1970 820100 all checks consistent
31.03.1970 1065165 all checks consistent
01.04.1970 958148 all checks consistent
02.04.1970 954144 all checks consistent
03.04.1970 43070 all checks consistent
04.04.1970 53686 all checks consistent
05.04.1970 975165 all checks consistent
06.04.1970 958148 all checks consistent
08.04.1970 11108218 all checks consistent
09.04.1970 11121231 all checks consistent
10.04.1970 10109209 all checks consistent
11.04.1970 10104204 all checks consistent
12.04.1970 35585 all checks consistent
13.04.1970 1066166 all checks consistent
14.04.1970 752122 all checks consistent
15.04.1970 842122 all checks consistent
18.04.1970 551101 all checks consistent
20.04.1970 42767 all checks consistent
21.04.1970 63898 all checks consistent
22.04.1970 647107 all checks consistent
23.04.1970 53787 all checks consistent
24.04.1970 751121 all checks consistent
25.04.1970 733103 all checks consistent
26.04.1970 52373 all checks consistent
27.04.1970 739109 all checks consistent
28.04.1970 1069169 all checks consistent
29.04.1970 775145 all checks consistent
30.04.1970 954144 all checks consistent
01.05.1970 858138 counts consistent, some coordinates doubtful
02.05.1970 847127 all checks consistent
05.05.1970 1050150 all checks consistent
06.05.1970 ——— reading could not be verified
07.05.1970 942132 all checks consistent
08.05.1970 851131 all checks consistent
09.05.1970 62585 all checks consistent
10.05.1970 1153163 all checks consistent
11.05.1970 1167177 all checks consistent
12.05.1970 1055155 counts consistent, some coordinates doubtful
13.05.1970 957147 all checks consistent
14.05.1970 1199209 all checks consistent
15.05.1970 11102212 all checks consistent
16.05.1970 681141 all checks consistent
17.05.1970 12139259 all checks consistent
18.05.1970 9114204 all checks consistent
19.05.1970 12147267 all checks consistent
20.05.1970 11131241 all checks consistent
21.05.1970 1170180 all checks consistent
22.05.1970 973163 all checks consistent
23.05.1970 774144 all checks consistent
24.05.1970 962152 all checks consistent
26.05.1970 1161171 all checks consistent
27.05.1970 1482222 all checks consistent
28.05.1970 1382212 all checks consistent
29.05.1970 1175185 all checks consistent
30.05.1970 851131 all checks consistent
31.05.1970 1290210 counts consistent, some coordinates doubtful
01.06.1970 ——— reading could not be verified
02.06.1970 739109 all checks consistent
03.06.1970 72595 all checks consistent
04.06.1970 61979 all checks consistent
05.06.1970 ——— reading could not be verified
06.06.1970 4646 all checks consistent
07.06.1970 71484 all checks consistent
08.06.1970 41050 all checks consistent
09.06.1970 33262 all checks consistent
10.06.1970 552102 all checks consistent
11.06.1970 669129 all checks consistent
12.06.1970 864144 all checks consistent
13.06.1970 749119 all checks consistent
14.06.1970 10142242 all checks consistent
15.06.1970 10117217 all checks consistent
16.06.1970 7154224 all checks consistent
17.06.1970 677137 all checks consistent
18.06.1970 8107187 all checks consistent
19.06.1970 847127 all checks consistent
20.06.1970 827107 all checks consistent
21.06.1970 943133 all checks consistent
22.06.1970 939129 all checks consistent
23.06.1970 833113 all checks consistent
24.06.1970 747117 all checks consistent
25.06.1970 1096196 all checks consistent
26.06.1970 1161171 all checks consistent
27.06.1970 766136 all checks consistent
28.06.1970 1186196 all checks consistent
29.06.1970 771141 all checks consistent
30.06.1970 6105165 all checks consistent
01.07.1970 996186 all checks consistent
02.07.1970 11163273 all checks consistent
03.07.1970 10146246 all checks consistent
04.07.1970 ——— reading could not be verified
05.07.1970 ——— reading could not be verified
06.07.1970 ——— reading could not be verified
07.07.1970 999189 all checks consistent
08.07.1970 842122 all checks consistent
09.07.1970 1092192 all checks consistent
10.07.1970 865145 all checks consistent
11.07.1970 862142 all checks consistent
12.07.1970 63696 all checks consistent
13.07.1970 855135 all checks consistent
14.07.1970 753123 all checks consistent
15.07.1970 935125 all checks consistent
16.07.1970 744114 all checks consistent
17.07.1970 737107 counts consistent, some coordinates doubtful
18.07.1970 53181 counts consistent, some coordinates doubtful
19.07.1970 944134 all checks consistent
20.07.1970 ——— reading could not be verified
21.07.1970 975165 all checks consistent
22.07.1970 962152 all checks consistent
23.07.1970 669129 all checks consistent
24.07.1970 785155 all checks consistent
25.07.1970 9105195 all checks consistent
26.07.1970 10124224 all checks consistent
27.07.1970 10117217 all checks consistent
28.07.1970 ——— reading could not be verified
29.07.1970 1171181 all checks consistent
30.07.1970 1382212 all checks consistent
31.07.1970 861141 all checks consistent
01.08.1970 751121 all checks consistent
02.08.1970 743113 all checks consistent
03.08.1970 52979 all checks consistent
04.08.1970 62888 all checks consistent
05.08.1970 554104 all checks consistent
06.08.1970 657117 all checks consistent
07.08.1970 558108 counts consistent, some coordinates doubtful
08.08.1970 576126 all checks consistent
09.08.1970 473113 all checks consistent
10.08.1970 374104 counts consistent, some coordinates doubtful
11.08.1970 594144 all checks consistent
12.08.1970 36191 all checks consistent
13.08.1970 488128 all checks consistent
14.08.1970 462102 all checks consistent
15.08.1970 775145 counts consistent, some coordinates doubtful
16.08.1970 682142 all checks consistent
17.08.1970 ——— reading could not be verified
18.08.1970 993183 all checks consistent
19.08.1970 1047147 all checks consistent
20.08.1970 1154164 all checks consistent
21.08.1970 1388218 all checks consistent
22.08.1970 864144 all checks consistent
23.08.1970 878158 counts consistent, some coordinates doubtful
24.08.1970 1071171 all checks consistent
25.08.1970 1046146 all checks consistent
26.08.1970 1070170 all checks consistent
27.08.1970 752122 all checks consistent
28.08.1970 1058158 all checks consistent
29.08.1970 1168178 all checks consistent
30.08.1970 1363193 all checks consistent
31.08.1970 1139149 all checks consistent
01.09.1970 1070170 counts consistent, some coordinates doubtful
02.09.1970 981171 all checks consistent
03.09.1970 1263183 all checks consistent
04.09.1970 11115225 all checks consistent
05.09.1970 10103203 all checks consistent
06.09.1970 1392222 counts consistent, some coordinates doubtful
07.09.1970 17111281 all checks consistent
08.09.1970 14129269 all checks consistent
09.09.1970 15104254 all checks consistent
10.09.1970 1349179 all checks consistent
11.09.1970 1073173 all checks consistent
12.09.1970 847127 all checks consistent
13.09.1970 1131141 counts consistent, some coordinates doubtful
14.09.1970 833113 all checks consistent
15.09.1970 1164174 all checks consistent
16.09.1970 1138148 all checks consistent
17.09.1970 1136146 counts consistent, some coordinates doubtful
18.09.1970 750120 all checks consistent
19.09.1970 870150 all checks consistent
20.09.1970 12103223 all checks consistent
21.09.1970 13101231 all checks consistent
24.09.1970 ——— reading could not be verified
25.09.1970 ——— reading could not be verified
26.09.1970 1073173 all checks consistent
27.09.1970 754124 all checks consistent
29.09.1970 763133 all checks consistent
30.09.1970 743113 counts consistent, some coordinates doubtful
01.10.1970 744114 counts consistent, some coordinates doubtful
02.10.1970 ——— reading could not be verified
03.10.1970 41757 counts consistent, some coordinates doubtful
04.10.1970 552102 all checks consistent
05.10.1970 45595 all checks consistent
07.10.1970 586136 all checks consistent
08.10.1970 4102142 all checks consistent
09.10.1970 3123153 all checks consistent
10.10.1970 4114154 all checks consistent
11.10.1970 573123 all checks consistent
12.10.1970 680140 all checks consistent
13.10.1970 897177 counts consistent, some coordinates doubtful
14.10.1970 975165 counts consistent, some coordinates doubtful
15.10.1970 651111 all checks consistent
16.10.1970 756126 counts consistent, some coordinates doubtful
19.10.1970 960150 counts consistent, some coordinates doubtful
20.10.1970 1080180 all checks consistent
21.10.1970 841121 all checks consistent
22.10.1970 952142 all checks consistent
23.10.1970 946136 all checks consistent
27.10.1970 8151231 all checks consistent
28.10.1970 6133193 all checks consistent
29.10.1970 8143223 all checks consistent
30.10.1970 ——— reading could not be verified
31.10.1970 895175 all checks consistent
01.11.1970 755125 all checks consistent
02.11.1970 ——— reading could not be verified
03.11.1970 1554204 counts consistent, some coordinates doubtful
04.11.1970 ——— reading could not be verified
05.11.1970 751121 counts consistent, some coordinates doubtful
06.11.1970 ——— reading could not be verified
08.11.1970 ——— reading could not be verified
10.11.1970 ——— reading could not be verified
12.11.1970 53888 counts consistent, some coordinates doubtful
13.11.1970 ——— reading could not be verified
14.11.1970 5114164 all checks consistent
16.11.1970 6180240 all checks consistent
17.11.1970 6117177 all checks consistent
18.11.1970 7234304 all checks consistent
19.11.1970 ——— reading could not be verified
20.11.1970 ——— reading could not be verified
21.11.1970 994184 all checks consistent
22.11.1970 ——— reading could not be verified
24.11.1970 838118 all checks consistent
26.11.1970 ——— reading could not be verified
30.11.1970 ——— reading could not be verified
04.12.1970 847127 all checks consistent
07.12.1970 761131 counts consistent, some coordinates doubtful
08.12.1970 767137 all checks consistent
09.12.1970 44787 all checks consistent
11.12.1970 11117227 all checks consistent
13.12.1970 662122 all checks consistent
14.12.1970 54595 counts consistent, some coordinates doubtful
15.12.1970 736106 counts consistent, some coordinates doubtful
21.12.1970 795165 all checks consistent
24.12.1970 774144 all checks consistent
25.12.1970 743113 all checks consistent
26.12.1970 736106 all checks consistent
27.12.1970 52272 all checks consistent
28.12.1970 ——— reading could not be verified
29.12.1970 63090 all checks consistent
30.12.1970 834114 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.