Results 141 to 150 of about 995 (183)

X-ray emission from solar flares

Journal of Astrophysics and Astronomy, 2008
Solar X-ray Spectrometer (SOXS), the first space-borne solar astronomy experiment of India was designed to improve our current understanding of X-ray emission from the Sun in general and solar flares in particular. SOXS mission is composed of two solid state detectors, viz., Si and CZT semiconductors capable of observing the full disk Sun in X-ray ...
Rajmal Jain
exaly   +2 more sources

On the origin of solar flare X-rays

Solar Physics, 1971
The origin of X-ray solar bursts is investigated on the basis of the theoretical model developed by Syrovatskii. According to this model (i) one of the most important manifestations of flares is the acceleration of charged particles (mainly of electrons) to subrelativistic and relativistic energies, and (ii) the two flare phases: stationary (soft) and ...
openaire   +1 more source

X-ray precursors in solar flares

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science, 2000
Abstract A clear understanding of the physics of flares remains an important goal of solar research. One important aspect of this question is to determine the various stages or phases of flares. Two stages of flares have long been known: a gradual, or thermal phase, best observed in soft X-rays, and an impulsive phase, best observed in hard X-rays ...
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On the production of hard X-rays in solar flares

Solar Physics, 1990
The problem of producing the hard X-ray burst at the onset of solar flares may be thought of in terms of the problem of producing the non-thermal electrons which emit the X-rays via bremsstrahlung. Electron acceleration to relativistic energies without similar ion acceleration is difficult to achieve, even in an ad hoc theoretical model.
G. M. Simnett, M. G. Haines
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On the polarization of the emission of X-ray solar flares

Solar Physics, 1970
X-ray polarization measurements at three flares occurred in October 1969 were performed by means of a Thomson scattering type instrument installed on board the satellite ‘Intercosmos-1’. The polarization (P) at the wavelength of about 0,8 A was detected at the rising phase and at the second maximum of intensity. The obtained averaged value of P for all
I.P. Tindo, V.D. Ivanov, S.L. Mandel'stam, A.I. Shuryghin   +3 more
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X-Ray Observations of Solar Flares

1988
Major observational highlights of the last solar maximum are reviewed with emphasis on the results obtained by Japanese Hinotori satellite. Three different types of flares were observed by Hinotori: Type A flares have purely thermal nature, and generate dense superhot plasma throughout the flare evolution.
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Prospects for solar flare X-ray polarimetry

Solar Physics, 1988
The history of solar flare X-ray polarimetry is reviewed and it is shown that as yet, there is no experimental evidence for such polarization. The present experimental limits are at the level of a few percent but these results may be biased by a large thermal component at low energies which may decrease the apparent polarization.
Gary Chanan, A. Gordon Emslie, Robert Novick   +2 more
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The solar albedo of hard X-ray flares

Solar Physics, 1973
The calculations of Compton backscattering from the solar surface of flare X-rays performed by Tomblin (1972) are extended to higher energies. It is shown that the effect is even more pronounced in the 40 keV region and that it can lead to substantial corrections to the observed X-ray spectra.
N. Santangelo, H. Horstman, E. Horstman-Moretti   +2 more
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Hard X-ray Emission Processes in Solar Flares

Solar Physics, 1987
Solar hard X-ray emission is one of the most direct diagnostics of accelerated particles during solar flares. In this review, the current understanding of hard X-ray emission processes is discussed: first the different emission mechanisms (in particular inverse Compton radiation, energetic ion or electron bremsstrahlung) are presented and the ...
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Influence of Solar Flares on the X-ray Corona

1986
Sequences of X-ray images of solar flares, obtained with the Hard X-ray Imaging Spectrometer (HXIS) on the SMM spacecraft, reveal many dynamical phenomena. Movies of 20 flares recorded with 6-sec time resolution were examined. We present here a preliminary analysis of the events as a group, and discuss some new aspects of the well-studied 1980 May 21 ...
D. M. Rust, D. A. Batchelor
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