Adopted polarity for each day is arranged by month of year (e.g., for 1947 data, months Jan-Dec are given vertically by the 1 through 12, days are given horizontally across). The data are grouped by 5 day increments for easier reading. The coding is: C = Toward polarity; B = Mixed polarity; A = Away polarity. 1947 1 acccc ccaaa aaaaa bcccc cbabc ccccb b 2 cccba aabca aaaaa bcccc aaaaa aaa 3 bcbaa aabaa acccc bcccc caaca bcbcc a 4 cacab abaac ccccc ccbaa aaaaa aaaaa 5 aaaaa aaaac ccccc ccccc aaaca ababa a 6 aaaac ccccc cccaa baaba aaaaa aabaa 7 abaac ccccc ccccc bbcaa baaaa aacaa b 8 ccccc ccccc ccaab bbaaa aacac abccc c 9 ccacb ccccb acaab aaaca abccc ccccc 10 cbccc cbaaa aaaaa aaaaa acbac ccbcc c 11 cbaac baaab cccba aaaaa bacab ccccc 12 ccbaa bcabb cbaab baaaa baccc bccba a 1948 1 cbccc caaab aaaaa acccc cccbc aaabb a 2 bbcca abaaa aaaac ccccb aaacb aacc 3 abaaa aaaab baccc ccaaa caaac bcccc c 4 aaaaa acacc ccaaa abaaa ccbac cccca 5 aaacc cbcba aaaba abccc ccccc caaab a 6 accca acaaa aabaa acbcc cbccc aaaaa 7 ccacc accaa aaccb ccccc aaaaa ccbaa a 8 aaaaa abccc ccccc cccbc ccccc caaaa a 9 aaccc acccc bcccc ccccc cccab aabaa 10 abbac ccccc ccccb bcccb bcaaa aabaa a 11 abccc bccbc baabc cbaac ccccc ccaba 12 cacaa ccccc babba ccbaa cbccc aaaab c 1949 1 ccbcc ccbaa cccba abcbb aaabc ccbcc c 2 ccacc ccbca cccbb cbaab aacaa bcc 3 aaaac aaaaa aaccc cbccc cbabc aacca b 4 acabc aaccb cacca ccccc baaaa aaaaa 5 caacc cccca abccc ccbaa aaaaa aaaaa c 6 ccccc abaaa cccac ccaaa abaac ccccc 7 bccbb aaaaa aaacc aaaaa acccc bccba a 8 aabcc cbaaa aaaaa acccc cccca aaaaa c 9 bccba aaaaa acccc bcbcc aabaa abbca 10 aaabb aaccc ccccc ccaaa aaaaa accaa b 11 caaac cccbc bcaaa abacb bccaa baccc 12 acccc aaaca aaacc caaaa baaaa bcccc c 1950 1 cccca aabcc cccbc caaaa aaacc ccccc c 2 cbaaa bcccb caaaa bcacc babab cca 3 aaaaa bcbac cccaa aaacc ccabc aabcc c 4 bbcba cccaa aaaac ccccc aaaaa acccb 5 ccccc cabaa baccc caaba aaccc ccccc c 6 ccacc caccc cccaa abaaa acccc ccabc 7 baacc baaaa caaba aaaac cccca acccc c 8 ccccc caaaa aaacb cccaa aaaaa aaccc c 9 caaaa aaaaa abccc baaaa aaccc ccaba 10 ccbaa aaaac ccaca aaaac ccccc cccca a 11 baaaa aaccc aabaa ccccc ccccc ccaaa 12 aabcc cabaa acccc ccccc cccca aaaaa c 1951 1 ccccc baaac ccccb cbaac cbaaa ccccc c 2 caaac aaacc cccaa baaaa aabbb bcc 3 aaaab ccccc bcbac aacaa acccc cccca a 4 acbcc ccccc aaaaa aaccc ccccc caaaa 5 ccccc ccccb aaacc ccacc cbcaa acbab a 6 cccca babab ccccc baaab aaaab aaccc 7 aaaab ccccc ccccb aaaaa aaaaa aaaaa c 8 ccccc ccccc aaaaa abcaa aaaaa aaabc c 9 ccccc cccaa aaaaa aacca aaaaa cccca 10 ccccc caaaa aaaaa aaaaa aaacc ccccc c 11 baaaa aabcc abcaa abccc ccccb cbaaa 12 aaacb aaaba aaabc ccccc ccbcc aaaaa b 1952 1 ccccc ccacc ccccc cacaa cccca accca b 2 aaaab ccccc ccbca aaaaa aaacc cbaa 3 aaccc ccccc ccccc aaaba cccca aaaac c 4 ccccc cccca aaaaa aaccc cbaaa aaccc 5 ccccc ccccc aaaaa aabca aaccc cccca c 6 ccccc acbbb aaaaa abaaa acccc ccacc 7 ccaab aaaaa aaaab aacbc ccccb ccccc a 8 aaaba aaaaa aaaaa ccccc cbcaa aaaca a 9 aaaac aabaa ccccc ccccc caaac cccca 10 aaaaa aaccc ccccc baaaa cccbc caaaa b 11 aaaaa ccccc caaaa acccc ccaaa aaaaa 12 ccccc baaab aaabb aaaaa abaaa aaccc c 1953 1 cccba baaaa aacba aaaaa aaacc ccccc a 2 aaaaa aaabc aaaaa cbaaa ccccc ccc 3 accbc ccccc abaaa aaacc ccccc caccc c 4 cbccc ccaaa aaaaa aabcc ccaaa baaac 5 aaaaa aaaaa aaaac cccbc ccaaa aacaa c 6 aaaaa aaaaa aaaca cbbac acccc acaab 7 aaaaa accaa accca aaaac ccccb aaaaa a 8 aaaaa aaacb cccaa abaaa acaaa abccc c 9 aaccc aaaaa ccaac aabcc accaa aaaca 10 aacaa aaabc bcbcc ccccc caaaa aaacc c 11 aaabc ccbbb ccccc aabcc aaacc ccbaa 12 abbcc ccccb ccaaa aaccc bcccb bcccc a 1954 1 bcaac abaaa bbaac ccccc ccbab ccaaa c 2 cccca acccc caacc cccaa cbccc ccc 3 bcbac ccccc ccccc ccccc accca cbabc c 4 cccca acacc cccbc ccccc caccc ccaba 5 aaabc aabcb bccac bcbbc caaaa babaa c 6 bcacc baaaa accaa aaaaa acbaa aaaaa 7 aaaaa aaaaa aaaba ccaaa aaaaa aaaaa a 8 aabaa aaaba aaaaa aaaaa aaaaa aabbb a 9 cacbc cbbca aaacb cabab aaacb aabcc 10 babaa cbbaa aaaaa baccc acccc aaaaa c 11 cccaa abcaa acacb aaacc cacca acacc 12 aaabc cccca bccaa accca aacab aaaaa a 1955 1 bbacb abaca cabaa ccccc cbccc abbcc a 2 aaccb cccca cccca cabac aaccc aab 3 aaaaa bcccc ccccc cacca abccc aaaaa c 4 acccc cccac abaaa aacab caacc ccccc 5 cbbaa acaba acaaa aaaaa aaaab ccccc b 6 caacc cbaab aaaaa aaaaa baccc ccbca 7 bcbaa aaaaa bcaaa aaaaa abbaa aabaa a 8 aabca ccaaa aaaca abaaa aaaaa cbcaa a 9 caaba acaaa aaaaa bbaac bcaca baabc 10 cabcc cbbca aaaaa accca acccc babaa c 11 ccbaa aaccb ccccc bbccc aaaaa aaaab 12 cbccc bcccc cccba aaaab caabc cccaa b 1956 1 ccccc ccccc cccaa aacca abbba acccc c 2 ccaab ccccc ccaac abaab ccccc ccbc 3 ccacc caaaa cbaaa aaaac ccacc cccbc c 4 cccca aaaaa aaaaa acccc ccaba cccaa 5 aaaaa aaaaa acbac ccbcc ccccc ccaaa a 6 baaaa aaaac ccccc ccccc cccca aaaaa 7 aaaaa aaccc cccca acccc cbcaa aabaa b 8 aacaa cccba ccccc ccccc caabb aaaaa b 9 caaaa acbcc cbccc ccaca abaaa aabaa 10 aaacc ccccc ccccc bcaaa aaaac caaaa a 11 ccccc ccccb cccaa aaaaa acccc cccac 12 ccccb cbbbc bcaaa aabcc ccccc ccccc c 1957 1 acccc cbccc cccaa aaaac ccccc ccccc c 2 ccccc ccccc aaaaa acccc ccccc ccc 3 acccc caccc aaaaa aaccc ccccc ccacc c 4 ccccc cccaa aacac ccbcc aacbc cccaa 5 ccccc aaacc acccc caccb cccbc caacc c 6 aacbc ccacc aaccc cccba ccbcb accac 7 ccbcc bcaba ccaab aabcc aaaaa aaccc c 8 acccb ccaaa acccc ccaaa acccc ccccc b 9 acccc cbbbc cbaca aaccc bcbab aaccc 10 ccccc cccaa aaaab ccccc ccccc ccccc c 11 ccccc aaaaa aaacc ccccb ccccc ccccc 12 aaaaa aaaac ccccc ccccc ccccc cccaa c 1958 1 caaaa aaacc ccccc ccccc ccccc ccaaa a 2 aaaac ccccb ccccc bcccc cccca aaa 3 caacc ccccc cabac ccccc ccccb bcaaa c 4 cbaca cbcca aaaac ccccc ccccb aaccc 5 ccccc caaba aaccc ccccc aaaaa ccccc c 6 caaaa aaacc ccccc ccccc ccccc cccaa 7 aaaaa accac caaaa ccccc cbccc bccaa a 8 aaaaa ccaca acccc abccc ccbaa aaaaa a 9 aabaa bcccc ccccc caccc ccaab aaaaa 10 bcaac ccccc bcacc cccbc aaacc aaaaa c 11 ccccc cbbbc ccccc aaaaa acaaa aaaac 12 ccccc ccccc baccc cacba aaaaa cabcb b 1959 1 baaac ccccc cccba ccbaa aaaaa cbbac c 2 acccc ccccc aabaa aaaab aaaaa ccb 3 ccccc cccaa aaaaa aaaaa aaaac ccccc b 4 cccaa accab baaaa aaaaa aaacc cccca 5 aaaab aabaa aaaaa bbbcc cbccb ccccb c 6 cccaa aaaaa aabaa aaccc cccbc cbbcb 7 cccaa aaaaa aabbc ccccc ccccc ccccc a 8 aaaaa aaaaa ccccc ccccc ccccb cccaa a 9 aaaba acacc ccccc cccca ccaaa aaaaa 10 aacaa aaaaa bcccc ccccb cbaaa aabab b 11 aabbb aaacc ccccc aaaaa aacba acaab 12 aabab ccccc cccaa aaaaa aacca cbcaa a 1960 1 aaccc ccccc ccaaa abbbc bbcca aaacc b 2 bcccc caaca acaaa ccaba aaaaa aacc 3 ccccc aaaaa aaabc aaaaa aaaaa accbc c 4 cbcaa aaaaa aaaaa acabc baacc ccccc 5 ccaaa cabaa abcaa aaaaa aaaac cccaa c 6 aabaa aacba acaaa aaaaa ccbcc ccbab 7 aaaaa aaaaa aaaac ccccc ccccc abcaa a 8 aaaaa baaaa aaaaa aaaac ccccc caaaa a 9 aaaaa aaaaa aacab ccccc acccc ccaaa 10 aabaa aabaa acccc ccaaa aacac baaaa a 11 aaaaa aaaaa bcbcc cccca aaaaa aaaaa 12 baaaa aaaaa acbcc ccaaa caaaa bccba b 1961 1 caaaa cabca abccb aaacb bbaaa aaaaa a 2 cccbb ccccc aabaa aabab abaaa acc 3 cbaaa aacca aaaaa aaaaa aaaab acccc a 4 acccc caaaa aaaca aaaaa acccc accac 5 caaaa aacaa aaaaa acacc cbacc cccaa a 6 aaaaa aaaab aaaaa ccccc ccaaa baaac 7 aaaaa aabaa aabba caccc caaac acccc c 8 aaaaa aaaaa acccc ccbaa abaac cabaa a 9 aaaaa aaacc cbcaa aaaaa cccab aabaa 10 cccbc acbaa aaaaa acccc cccaa bacca a 11 aacba acabb cbbbc cbcaa abaaa aaaaa 12 ccccc ccacc caaaa aaaaa aaaaa acccc a 1962 1 aaaaa abaac ccbcc caaca aaaaa aaaaa a 2 aaaac ccbbb aaccc caaaa aaacb cba 3 cccbc caaac cccaa abaaa aaacc caaaa a 4 aaaaa cccbc bbaaa aaaaa baaaa acccc 5 cccbc ccaaa baaaa aaaaa aaaaa ccbcb c 6 bccbc caaaa aaaaa aaaaa ccccc ccccc 7 bccaa aaaaa aaaac aaacc cccca ccccc a 8 aabaa aaaaa aaccc ccccc ccccc bcaaa b 9 aaaba aaaac ccccc ccccc ccccc aaaaa 10 aaaaa aaccc ccccb ccccc aaaaa aaaaa a 11 abbcc cccbc ccccc caaaa bbbba aaaaa 12 aaacc cccbc cccba abccb baaaa baaaa c 1963 1 baacc bcccb ccbaa aaaaa aaaaa aaaac c 2 cabcb ccaac aabac aaaaa aaaaa aaa 3 acbcc abcbb caaaa aabcb aaaac aaaca a 4 caaaa aaaac ccccc cccaa aaccc ccaab 5 aacca aaccc cbbca aaaaa cccbc ccaaa a 6 aaaaa acccc aacaa bacac aaaab aaaab 7 aaacc ccbcc ccbcc abbcc aaaaa abaac c 8 ccccc ccbca acccc ccaaa aaaac ccccc c 9 cbccc acccc accaa aaaaa aaaca aaaab 10 baaba accaa aaaaa aaaaa acccb baccc c 11 cccaa aaaaa aaaaa acccc ccbca caaac 12 ccaab aaaaa aabcc ccccc aaaaa aaccc b 1964 1 aaaaa aaccc ccccc caaaa aaccc ccaaa a 2 aaacc ccccc aaaaa aaabb ccaaa aaaa 3 aaacc bccca aaaaa baaab baaaa aaaaa c 4 ccccc ccaaa aaaac baaba aaccc acccb 5 ccaaa aaaaa abcaa abaaa aaacc ccccc a 6 baaaa cccca baaaa aaccc caccc ccbaa 7 abccc caaca aaaaa bcccc ccccc aaacc c 8 ccaaa aaaaa ccccc cbbba acaac ccccc a 9 aaaaa acccc ccccc caaaa acccc baaaa 10 aaacc ccbcc caaaa aaccc cccaa aaaaa a 11 ccccc ccaaa aaaac cccca aaaaa aaccc 12 ccccc aaaaa accba aaaaa aaaaa ccccc c 1965 1 caaaa aaccc caaaa aaaaa aaaaa aaaba a 2 acccc ccaaa aaaab aabcc aaaaa aaa 3 abbaa caaaa aaaaa aaaaa aaaaa aaaaa a 4 ccaaa abaab cccbc aacaa aaaaa accca 5 aaaac ccccc ccccb aaaaa ccabb caaaa a 6 ccccc cccca aaacc aabcc bccca aaacc 7 ccccc aabbc ccccc ccccc bcaaa acccc c 8 cbccc ccccc ccccc cccaa aaacc ccccc c 9 ccccc ccccc ccccc aaaaa abccc caacc 10 ccccc ccccc ccccc aaaaa ccaaa ccccc c 11 ccccc aaacc ccaac cbbaa aaaac ccccc 12 aaaca aaccc ccccc aabaa accba aaaaa a 1966 1 abccc ccccb cccaa aaaac ccaab aaaaa a 2 bcccc ccccc caaaa aaaaa aaaaa aaa 3 aaacc ccaaa bbcac cbaaa aaccb aaaac c 4 ccccc cccaa aaaaa aaaac caaaa aaacc 5 ccccc ccaaa aaaaa ccccc aaaaa ccccc c 6 cccca aaaab ccccc caaaa aaccc ccccc 7 cccba aaccc cccac baaaa ccccc ccaac c 8 ccccc cccca aaaaa aaccc ccccc ccccc c 9 ccccc aaaaa aaacc ccccc ccccc ccccc 10 cccaa aaaaa acccc ccccc ccccc ccccb a 11 aaaaa aabcc ccccb cbcac ccccc ccaaa 12 aaacc ccccc ccccc bbccc cacaa abaaa a 1967 1 acccc aaaaa ccccc ccaaa aaaaa aaaaa a 2 aaaab acccc cccaa aaaac bcaaa aaa 3 aaaaa abacc aabca aaacc ccaaa aaaaa a 4 aaccc ccccc ccaab ccccc ccaaa aaaaa 5 abccc caaaa ccccc ccbcc caaaa bcbbc c 6 cccca bcccc ccbcc cccaa cbbac ccccc 7 abccc aaaaa ccccc ccccc ccccc ccccc c 8 cccba aaacc bbccc ccccb baccc ccccc a 9 aaaaa bcccc ccccc bcccb bcccc caaaa 10 aaccc cbbcc ccccc ccccc cccaa aaccb b 11 ccbaa bcccc cccbc ccccc aaaaa aabaa 12 aaaac ccccc ccbbc baabb aaaaa aaaaa a 1968 1 acccc ccccc ccccc aaaaa aaaaa aaacc c 2 ccccc ccccc aaaaa abbaa aaaaa accc 3 ccccc cccca aaaaa baaaa aaccc ccccc c 4 ccccc aaaac caaaa aaaaa ccccc ccccc 5 caaaa acccb aaaaa abccc ccccc cccaa a 6 ccccc caaaa aabcc ccccc caaaa aaccc 7 ccaaa aaaac ccccc cbaaa aaaac ccccc c 8 aaaac ccccc cccaa aaaaa ccccc ccccc a 9 acccc cccaa aaaaa aaacc ccccc baaaa 10 ccccc cbaaa baaaa acccc cccca ccaba a 11 ccaba aaaaa aaccc ccccc ccccc cccca 12 aaaba aaaac ccccc ccccc cccaa aaaaa a 1969 1 aaaaa bcccc ccccc ccccc cccaa aaaaa a 2 abccc ccccc ccccc ccaaa aaaaa acc 3 aaaac ccccc ccccc cbaac cccca aaaaa a 4 ccccc ccccc aabcc ccccc aaaaa aaacc 5 ccccc ccaaa aaccc cccaa aaaaa aaccc c 6 ccccc cabcc cccca aaaaa aaccc ccccc 7 ccccc bcccc aaaaa aaaba acccc cccca a 8 acccc caaaa aaaab acccc ccccc baacb c 9 cccca aaabb aaaac acccc ccccc cccca 10 aaaaa aaaba aaaaa ccccc ccccb ccccc a 11 aaaaa caabb ccccc ccccc ccccc abaaa 12 aaaaa bbbcc ccccc ccccc ccaaa aaaaa a 1970 1 aaabc ccccc ccccc cccaa aaaaa aabba c 2 bcccc cccca aabaa aaaaa aabaa aac 3 ccccc cccba bcaba aaaaa abaaa bcccc c 4 bcaba aaaaa aaaaa cccaa acccc cccca 5 aaaaa aaaaa acccc caaac ccccc ccaaa a 6 aaaaa aaccc ccccc ccccc cccaa acaab 7 aaaac ccbaa ccccc ccccc abaaa bcbaa a 8 ccccc acccc ccccc abaaa aaaaa aaaaa a 9 ccccc ccccc ccaaa aaaaa aaaaa aaacc 10 ccccc ccccc aaaaa aaaab cbaaa acbcc c 11 cccca aaaaa aaaac bccba aaacc ccccc 12 ccbaa aaaaa aaccc caaaa aaccc cccca a 1971 1 aaaaa aaccc aaaaa aaccc ccccc aaaaa a 2 aaabc caaaa aaacc ccccc cccca aaa 3 acccc caaaa aaccc ccccc ccaaa baaac c 4 cccaa aaacc ccccc cccaa abcaa cccaa 5 aaaba ccccc ccccc aaaaa abbcc cccaa a 6 ccccc ccccc ccccc aaaba bbbca aaacc 7 ccccc baccc ccaaa aaacc cccaa acccc c 8 ccccc ccaaa aaaaa abbaa aaccc ccccc c 9 cccca aaaaa aaccb baacc ccaac cccca 10 aaaaa cccaa aaccc ccccc aaccc ccaaa a 11 aaacc cccab ccccc cccbc ccaaa aaaaa 12 ccccc bcccc ccccc cbaaa aaaaa aacbc c 1972 1 ccccc ccccc ccccc aaaba bcccc ccccc c 2 cabcc ccccb aaaaa aaccc cccbc cccc 3 acccc caaaa aaaaa ccccc ccccc caacc c 4 cccaa aaaac ccccc cccab ccaaa abbcc 5 caaaa aabcc ccccc aacaa aaccb ccaaa a 6 aaacc cccca aacba bcaac cccca aaaaa 7 aabcc cbacc baaaa ccccc ccaaa aaaaa c 8 caaaa acccc ccccc caaaa aaaaa caaaa b 9 aaacc ccaaa aaaaa aaaaa acaaa aaaaa 10 ccccc cccbb abaaa aaaba aaaaa accaa c 11 cbccc caaaa bccbb aaaaa aaccc ccccc 12 abccc cbccc ccaaa aaaaa acccc cccbc c 1973 1 ccccc caaaa aaaaa aaaca ccccc ccccc c 2 ccaba aaaaa aaaaa acccc ccccc ccc 3 ccbbc aaaba aaaaa aaacc ccccc ccccc a 4 aaaaa aaaaa ccccc ccccc ccccc ccbaa 5 aaaaa aabba acbaa ccccc cacbc ccaaa a 6 aaaaa aaaab ccccc caccc ccbaa bbcaa 7 aaacb aaccc ccccc cbcca caccc aaaaa a 8 abccc aacac ccccc ccaac cbaaa aaaba a 9 bccca aabcc ccaac cccca abaab baabb 10 caaaa aaccc ccccc aaaaa aaccc ccbaa a 11 aaaac ccccc ccbaa abbac ccbaa baaaa 12 aaacc ccccc accba accaa aaaba acccc c 1974 1 ccccc ccccc cccaa aaaaa aaaac ccccc c 2 ccccc cccaa aaaaa abaac ccccc ccc 3 ccccc caaaa aaaab aaaac cccca ccccc c 4 ccaaa aaaaa aaaaa cbccc ccccc cbcaa 5 aaaac bcaaa aabcc ccccc ccccc caaca a 6 aaaaa aaacc bcccc ccccc ccaca aaaaa 7 aaaaa ccccc ccccc ccccc ccaaa aaaaa a 8 acccc ccccc ccccc cccaa aaaaa ccccc c 9 ccccc ccccc ccbcc baaaa aaacc bcccc 10 ccccc ccccc ccaaa aaaaa aaccc bcccc c 11 ccccc cccaa aaaaa aaacc ccccc ccccc 12 bcccc caaaa caaaa acccc ccccc aaaac c 1975 1 ccbbb aacaa aaccc ccccc ccaaa accbc a 2 aaaaa aaccc ccbbc bbbcc aaaaa aaa 3 aabca aaccb cccbc ccccc aaaac bbaaa c 4 bcccc ccccc baabc caaaa bcbaa aaaba Data provided by the Institute for Plasma Research, Stanford University, Stanford, California.