Abstract
On the basis of original observations, five white-light flares (WLF) are investigated. Evidence is given that their emission is located in two points brightening on either side of the lineH ∥ = 0 and lying at the foot points of chromospheric loops. The area of WLF is ≈ 5 × 10−6 hemisphere, i.e. ≈ 0.007 of Hα flare area; the intensity of WLF is sometimes twice that of the background at the center of the disk. WLF are resolved into more bright and fine knots of ≈ 2′ in diameter. The position of WLF coincides with the brightest knots of Hα flares which are characterized by wide wings with rapid increase and decrease.
According to our estimates, the full output of the energy of a flare in the continuum and Hα are comparable; but, the energy emitted in integral light in time-unit through area-unit is by 2 orders of magnitude larger than the energy in monochromatic light.
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Slonim, Y.M., Korobova, Z.B. Investigation of five white light flares. Sol Phys 40, 397–410 (1975). https://doi.org/10.1007/BF00162386
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DOI: https://doi.org/10.1007/BF00162386