Forty years of measurements of the mean magnetic field of the Sun. An insight from today

  • V.A. Kotov Crimean Astrophysical Observatory, Nauchny, 298409


Over the last 40 years the CrAO and five other observatories of the world have carried out more than 18.5 thousand (daily) measurements of the mean magnetic field, MMF, of the Sun-as-a-star. The main MMF periodicity is caused by the Sun’s equatorial rotation with a synodic period of 26.92 ± 0.02 d (it was stable over decades but become “bifurcated” in the 23d cycle). It is shown that (a) the average sidereal period of the equator, 25.122 ± 0.010 d, occures to be in close resonant relations with the orbital and axial rotations of Mercury (5:2 and 5:3, respectively), (b) the most powerful longer period, 1.036 ± 0.007 yr, is suspiciously close to the Earth’s orbital period and (c) coincides with the average synodic period of revolution of giant planets 1.036 ± 0.020 yr, (d) the MMF reveals a substantial period of 1.58 ± 0.02 yr which agrees, within the error limits, with the synodic period 1.60 yr of Venus, and also (e) a significant periodicity 19.8 ± 2.5 yr connected plausibly with the 22-year magnetic cycle of the Sun. The origin of all these periodicities seems to be mysterious.

It is supposed that the resonances have emerged at the early stages of the formation of the Solar system, and their existence at the present epoch is caused by the peculiar structure and dynamics of the central core of our star. It is found that the average, over 40 years, MMF level is practically zero: -0.018  ±  0.015 G. We draw also attention to an abnormal behaviour of the cycle 23, manifested in: (1) the violation of the Gnevyshev-Ol’s rule for the pair of cycles 22-23, (2) the accelerated, by 1.2 %, rotation of the solar equator, and (3) a substantial increase of the length of the cycle (not less than 11.5 yr) as compared with the average length of the cycle in 20th century (10.5 yr). A problem of the so-called solar magnetic “monopole” is briefly discussed.


Download data is not yet available.


Акуна и др. (Acuna M.H., Connerney J.E.P., Wasilewski P., et al.) // Science. 1998. V. 279. P. 1676.
Альвен Х., Аррениус Г. // Эволюция Солнечной системы. М.: Мир. 1979.
Бигг (Bigg E.K.) // Astron. J. 1967. V. 72. P. 463. Бэбкок (Babcock H.D.) // Astrophys. J. 1959. V. 130. P. 364.
Витинский Ю.И., Копецкий М., Куклин Г.В. // Статистика пятнообразовательной деятельности Солнца. М.: Наука. 1986.
Гневышев М.Н., Оль А.И. // Астрон. журн. 1948. Т. 25. С. 18.
Говард (Howard R.) // Solar Phys. 1974. V. 38. P. 283.
Голдрайх и Пил (Goldreich P., Peale S.J.) // Ann. Rev. Astron. Astrophys. 1968. V. 6. P. 287.
Григорьев и Демидов (Grigoryev V.M., Demidov M.L.) // Solar magnetic fields and corona. V. 1. Novosibirsk: Nauka. 1989. P. 108.
Демидов М.Л., Григорьев В.М., Пещеров В.С. // Астрон. журн. 2005. Т. 82. С. 628.
Дэмотт (Dermott S.F.) // Mon. Not. Roy. Astron. Soc. 1968. V. 141. P. 349.
Котов В.А. // Изв. Крымск. Астрофиз. Обсерв. 1987. Т. 77. С. 39.
Котов В.А., Демидов М.Л., Ханейчук В.И., Цап Т.Т. // Изв. Крымск. Астрофиз. Обсерв. 1998. Т. 94. С. 110.
Котов В.А., Левицкий Л.С. // Изв. Крымск. Астрофиз. Обсерв. 1985. Т. 71. С. 32.
Котов В.А., Северный А.Б. // Общее магнитное поле Солнца как звезды. Каталог 1968–1976. М.: АН СССР. 1983.
Котов В.А., Ханейчук В.И., Цап Т.Т. // Кинем. и физ. небесн. тел. 2002. Т. 18. С. 205.
Котов В.А., Цап Т.Т. // Изв. Крымск. Астрофиз. Обсерв. 2005. Т. 101. С. 82.
Котов (Kotov V.A.) // Solar Phys. 2006. V. 239. P. 461. Ксанфомалити Л.В. // Астрон. вестник. 2001. Т. 35. С. 371.
Локвуд и др. (Lockwood M., Stamper R., Wild M.N.) // Nature. 1999. V. 399. P. 437.
Макаров и др. (Makarov V.I., Tlatov A.G., Callebaut D.K.) // Solar Phys. 1997. V. 170. P. 373.
Ньето М.М. // Закон Тициуса-Боде. История и теория. М.: Мир. 1976.
Овенден (Ovenden M.W.) // Vist. Astron. 1975. V. 18. P. 473.
Свалгард и Уилкокс (Svalgaard L., Wilcox J.M.) // Solar Phys. 1975. V. 41. P. 461.
Северный А.Б. // Изв. Крымск. Астрофиз. Обсерв. 1968. Т. 38. С. 3.
Северный (Severny A.) // Nature. 1969. V. 224. P. 53.
Уилкокс (Wilcox J.M.) // Comm. Astrophys. Space Phys. 1972. V. 4. P. 141.
Уилкокс и др. (Wilcox J.M., Schatten K.H., Tanenbaum A.S.) // Solar Phys. 1970. V. 14. P. 255.
Ханейчук и др. (Haneychuk V.I., Kotov V.A., Tsap T.T.) // Astron. Astrophys. 2003. V. 403. P. 1115.
Чаплин и др. (Chaplin W.J., Dumbill A.M., Elsworth Y. et al.) // Mon. Not. Roy. Astron. Soc. 2003. V. 343. P. 813.
Шеррер и др. (Scherrer P.H., Wilcox J.M., Svalgaard L. et al.) // Solar Phys. 1977. V. 54. P. 353.
Abstract views: 0
PDF downloads: 0
How to Cite
Kotov V., 2009. Izvestiya Krymskoi Astrofizicheskoi Observatorii, vol. 105, no. 1, pp. 75-90. Available at: (Accessed: 5December2020)
Research articles