Results 171 to 180 of about 53,020 (220)

Hard X-Ray Imaging of Solar Flares

2022
The idea for this text emerged over several years as the authors participated in research projects related to analysis of data from NASA's RHESSI Small Explorer mission. The data produced over the operational lifetime of this mission inspired many investigations related to a specific science question: the when, where, and how of electron acceleration ...
Piana M., Emslie A. G., Massone A. M., Dennis B. R.   +3 more
openaire   +1 more source

Statistical properties of soft X-ray solar flares

AIP Conference Proceedings, 2003
We investigate some statistical properties of soft X‐ray bursts produced by solar flares. The Probability Density Functions (PDFS) of soft X‐ray intensity fluctuations are shown to display wide, non‐gaussian tails. The shape of the PDFs is nearly unchanged as the timelag, used to calculate fluctuations, varies. A very similar behavior is found for PDFs
F Lepreti, V Carbone, P Veltri
exaly   +3 more sources

Periodic Solar Flare X-ray Emission

Nature, 1971
GLENCROSS1 has reported the observation of an apparent 6 min periodicity during X-ray flares observed in the 0.1 to 0.3 nm wavelength band. The detector was a soft X-ray sensor on the satellite OSO-IV launch in 1967. The observed flare profiles were examined in more than thirty X-ray events coincident with visible flares, and a histogram was ...
P E, Fehlau, W H, Chambers, J C, Fuller, W E, Kunz, R W, Milkey, N K, Blocker   +5 more
openaire   +2 more sources

Survey on Solar X-ray Flares and Associated Coherent Radio Emissions

, 2004
The radio emission during 201 selected X-ray solar flares was surveyed from 100 MHz to 4 GHz with the Phoenix-2 spectrometer of ETH Zürich. The selection includes all RHESSI flares larger than C5.0 jointly observed from launch until June 30, 2003 ...
A. Benz, P. Grigis, A. Csillaghy, P. Saint-Hilaire   +3 more
semanticscholar   +1 more source

Spectral component imaging of solar X-ray flares

Astronomy & Astrophysics
Solar hard X-ray (HXR) observations provide diagnostics of the hottest plasmas and of nonthermal electron populations present during solar flares and coronal mass ejections.
M. Stiefel, P. Massa, A. Guidetti, M. Battaglia, S. Krucker   +4 more
semanticscholar   +1 more source

Fast Transients in Hard X-ray Solar Flares

Solar Physics, 1983
We present the results of a search for fast spikes in 5483 hard X-ray solar flares as observed with the Hard X-Ray Burst Spectrometer on the Solar Maximum Mission (SMM). Hundreds of fast spikes with durations of less than 1 second have been detected at time resolutions of 128 ms and 10 ms.
Alan L. Kiplinger, B. R. Dennis, A. Gordon Emslie, K. J. Frost, L. E. Orwig   +4 more
openaire   +1 more source

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 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, Jain Rajmal
exaly   +2 more sources

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 ...
openaire   +1 more source

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
openaire   +1 more source