Abstract
Measurements of the electron density in 16 flares are summarized and discussed. For 13 of them the electron density has been determined by the halfwidth method discussed in Part I of this paper. In the flash phase of all disk flares of importance 1 + and higher the electron density exceeds 1013 cm−3 and increases with the flare importance. In the maximum of large flares the electron density exceeds 3 × 1013 cm−3 and declines to 1013 cm−3 and to lower values in about 20 minutes after the flash phase. In limb flares, i.e. higher than 5000 km above the solar limb, the electron density is lower than 5 × 1012 cm−3. This shows a decrease of the electron density in the flare elements situated in higher parts of the chromosphere. On the other hand, however, at least in some flares the electron density remains fairly constant within a wide range of height in the upper chromosphere and the low corona.
Similar content being viewed by others
References
Banin, V. A.: 1965, Izv. Crim. Astrophys. Obs. 34, 252.
DeFeiter, L. D.: 1966, Rech. Obs. Utrecht 18, 79.
DeFeiter, L. D. and Švestka, Z.: 1964, B.A.C. 15, 117.
Hirayama, T.: 1961, Publ. Astr. Soc. Japan 13, 152.
Jefferies, J. T. and Orrall, F. Q.: 1961a, Astrophys. J. 133, 946.
Jefferies, J. T. and Orrall, F. Q.: 1961b, Astrophys. J. 133, 963.
Polupan, P. N. and Yakovkin, N. A.: 1965, Astron. Žurn. 42, 764.
Suemoto, Z. and Hiei, E.: 1959, Publ. Astr. Soc. Japan 11, 185.
Švestka, Z.: 1963, B.A.C. 14, 234.
Švestka, Z.: 1965, Adv. in Astronomy and Astrophysics 3, 119.
Švestka, Z. and Fritzová, L.: 1967, Solar Phys. 2, 75.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fritzová-Švestková, L., Švestka, Z. Electron density in flares II: Results of measurement. Sol Phys 2, 87–97 (1967). https://doi.org/10.1007/BF00155894
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00155894