Abstract
Recent satellite data have given a better insight into the possible nature of extremely strong disturbances on the Sun and in the heliosphere by relating them to processes in the solar interior. The energy, momentum, and mass transfer on various spatiotemporal scales are organized in the Sun into a hierarchy of coupled nonlinear processes. Confirmation has been given to the fact that coronal mass ejections and solar flares are not linked causally but merely reflect the existence of two channels of free-energy dissipation in the solar atmosphere in the form of plasma motion and plasma emission; their relative role can be described by a corresponding nondimensional parameter. Information on the global asymmetry of the solar emission and active processes has been gained. A great diversity in the geometry of eruptive events (not necessarily associated with magnetic reconnection) has been revealed. In our opinion, the basic unresolved problems in the investigation of solar activity dictate the necessity of carrying out more accurate, absolutely calibrated measurements of the whitelight solar emission at appropriately high spatiotemporal resolutions. The development of direct and indirect techniques of measuring the electric fields and currents with the aim of reconstructing the solar and heliospheric current system remains a challenging task.
Similar content being viewed by others
References
Filippov, B.P. and Den, O.G., A Critical Height of Quiescent Prominences Before Eruption, J. Geophys. Res. A, 2001, vol. 106, no. 11, pp. 25177–25184.
Lifshitz, E.M. and Pitaevskii, L.P., Fizicheskaya kinetika (Physical Kinetics), Moscow: Nauka, 1979.
Oraevskii, V.N. and Sobel’man, I.I., Comprehensive Studies of Solar Activity on the CORONAS-F Satellite, Pis’ma Astron. Zh., 2002, vol. 28, no. 8, pp. 457–467 [Astron. Lett. (Engl. Transl.), vol. 28, no. 8, pp. 401–410].
Pudovkin, M.I., Kozelov, V.P., Lazutin, L.L., et al., Fizicheskie osnovy prognozirovaniya magnitosfernykh vozmushchenii (Physical Basis of Magnetospheric Disturbance Prediction), Leningrad: Nauka, 1977.
Veselovsky, I.S., Avdyushin, S.I., Panasyuk, M.I., et al., Solar and Heliospheric Phenomena in October–November 2003: Causes and Effects, Kosm. Issled., 2004, vol. 42, no. 5, pp. 453–508 [Cosmic Res. (Engl. Transl.), vol. 42, no. 5, p. 435].
Author information
Authors and Affiliations
Additional information
Original Russian Text © I.S. Veselovsky, 2006, published in Astronomicheskii Vestnik, 2006, Vol. 40, No. 4, pp. 291–298.