Extensive observations of solar flares made in high energy bands during the maximum of the present solar cycle are discussed with a special reference to the results from HINOTORI, and with attention to the relevant flare models. The hard X-ray (HXR) images from HINOTORI showed mostly coronal ...
In high-energy solar flares, defined as flares that emit an observable gamma-ray spectrum, there can be three subsequent phases of particle acceleration. Primary acceleration of electrons to ∼ 10 MeV occurs within less than 0.1 s. It is suggested that this happens in many explosive ...
1. Introduction Before the 21st Solar Maximum our understanding of flare radiation at energies greater than about 300 keV was based on actual measurements of only the 4 August, 1972 and 7 August, 1972 flares by high-energy detectors on the OSO-7 satellite (Chupp et al., 1973). The rest ...
Solar Flares:PlasmaWe describe a well-studied flare (21 May, 1984) for which the emission area is a plasma knot of a few hundred km diameter, with a temperature of 5 脳 10 8 K and a magnetic field between 1400 and 2000 G. We show that this region coincides virtually with the area ...
High Energy Particles in Solar Flares: Observations, Mechanisms and Transport We review the observations bearing on electron and ion acceleration in solar flares, and the key challenges they pose to theory. Solar flare hard X-rays testify to the presence of accelerated electrons, with energies exten...
The sub-arcsecond hard X-ray structure of loop footpoints in a solar flare The newly developed X-ray visibility forward fitting technique is applied to the RHESSI data of a limb flare to investigate the energy and height dependenc... EP Kontar,IG Hannah,NLS Jeffrey,... - 《Astrophysical ...
This chapter deals generally with the high-energy astrophysics of the Sun, specifically with solar flares and coronal mass ejections (CMEs), but it also touches on the whole range of nonthermality or departures from Maxwellian distributions in solar plasmas. Radio, x-ray, and γ-ray observatio...
Thus, we infer that the γ rays originated with the magnetar giant flare in Sculptor. We suggest that the GeV signal is generated by an ultra-relativistic outflow that first radiates the prompt MeV-band photons, and then deposits its energy far from the stellar magnetosphere. After a ...
High-energy particles are produced related to solar flares. There are two kinds of particles accelerated at the time when a solar flare occurs, i.e., electrons and ions. Information of electron acceleration is obtained by hard X-ray, radio wave, and H α bright line observations. On the ...
Venera-13, 14 data obtained from November 1981 to April 1982 are used to examine the correlation between bursts of hard solar X-rays (energy exceeding 0.055 MeV) and solar-cosmic-ray (SCR) flares. Data on solar flares in H-alpha, thermal X-rays, and type III radio bursts were used in...