YOHKOH observations of the Neupert effect

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Sun: X-Rays, Gamma Rays, Sun: Flares, Sun: Corona

Scientific paper

A Neupert effect is a well-known observational aspect of dynamics of many solar flares during their impulsive phase. Imaging capabilities of the Yohkoh satellite provide a new perspective in an investigation of this effect. In this paper it has been shown that impulsive soft X-ray brightenings are a direct cause of some soft X-ray excess resulting as the Neupert effect. An additional observational confirmation is presented that the impulsive phase of flares showing the Neupert effect is dominated by non-thermal electron beams. The importance of relatively soft (below 10 keV) non-thermal electrons in the production of soft X-ray brightenings is suggested.

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