THE BURSTY NATURE OF SOLAR FLARE X-RAY EMISSION. II. THE NEUPERT EFFECT

2013 ◽  
Vol 776 (2) ◽  
pp. 66 ◽  
Author(s):  
R. T. James McAteer ◽  
D. Shaun Bloomfield
Keyword(s):  
Solar Flare ◽  
X Ray ◽  
Neupert Effect

scholarly journals Generalization of the Neupert effect over the solar flare plasma cooling

2012 ◽  
Vol 8 (S294) ◽  
pp. 541-542
Author(s):  
Arun Kumar Awasthi ◽  
Rajmal Jain
Keyword(s):  
Solar Flare ◽  
Time Scale ◽  
Temporal Evolution ◽  
Time Derivative ◽  
Impulsive Phase ◽  
Cooling Time ◽  
X Ray ◽  
Neupert Effect ◽  
Flare Plasma ◽  
Rise Phase

AbstractWe investigate 10 M-class flares observed by the SOXS mission to study the influence of the solar flare plasma cooling on the Neupert effect. We study the temporal evolution of 1s cadence X-ray emission in 7-10 keV and 10-30 keV representing the SXR and HXR emission respectively. We model the cooling as a function of time by the ratio of time-derivative of SXR with the HXR flux. We report that the ratio is exponentially decaying in rise phase of the flare, which, however, saturates after the impulsive phase. We estimate the cooling time scale in the rise phase for the flares and found to be varying between 39 and 525 s.

Diagnostics of solar flare hard X-ray sources

Solar Physics ◽  
1978 ◽  
Vol 58 (1) ◽  
pp. 139-148 ◽  
Author(s):  
Peter Hoyng ◽  
Joshua W. Knight ◽  
Daniel S. Spicer
Keyword(s):  
Solar Flare ◽  
X Ray

scholarly journals Using the maximum X-ray flux ratio and X-ray background to predict solar flare class

Space Weather ◽  
2015 ◽  
Vol 13 (5) ◽  
pp. 286-297 ◽  
Author(s):  
L. M. Winter ◽  
K. Balasubramaniam
Keyword(s):  
Solar Flare ◽  
Flux Ratio ◽  
X Ray ◽  
X Ray Background

scholarly journals Electron Bremsstrahlung Hard X-Ray Spectra, Electron Distributions, and Energetics in the 2002 July 23 Solar Flare

2003 ◽  
Vol 595 (2) ◽  
pp. L97-L101 ◽  
Author(s):  
Gordon D. Holman ◽  
Linhui Sui ◽  
Richard A. Schwartz ◽  
A. Gordon Emslie
Keyword(s):  
Solar Flare ◽  
X Ray ◽  
Electron Bremsstrahlung ◽  
Electron Distributions

Correlations of solar-flare electron events with radio and X-ray emission from the sun

1968 ◽  
Vol 46 (10) ◽  
pp. S757-S760 ◽  
Author(s):  
R. P. Lin
Keyword(s):  
Solar Flare ◽  
Solar Radio ◽  
Interplanetary Space ◽  
The Sun ◽  
Radio Bursts ◽  
Radio Observations ◽  
X Ray ◽  
Type Iii ◽  
Electron Event ◽  
Burst Emission

The > 40-keV solar-flare electrons observed by the IMP III and Mariner IV satellites are shown to be closely correlated with solar radio and X-ray burst emission. In particular, intense type III radio bursts are observed to accompany solar electron-event flares. The energies of the electrons, the total number of electrons, and the size of the electron source at the sun can be inferred from radio observations. The characteristics of the electrons observed in interplanetary space are consistent with these radio observations. Therefore these electrons are identified as the exciting agents of the type III emission. It has been noted that the radio and X-ray bursts are part of the flash phase of flares. The observations indicate that a striking feature of the flash phase is the production of electrons of 10–100 keV energies.

scholarly journals The frequency of stellar X-ray flares from a large-scale XMM-Newton sample

2015 ◽  
Vol 11 (S320) ◽  
pp. 134-137
Author(s):  
John P. Pye ◽  
Simon R. Rosen
Keyword(s):  
Solar System ◽  
Solar Flare ◽  
Space Weather ◽  
White Light ◽  
Large Scale ◽  
The Sun ◽  
X Ray ◽  
Cool Star ◽  
Exoplanetary Systems ◽  
Solar Type

AbstractWe present estimates of cool-star X-ray flare rates determined from the XMM-Tycho survey (Pyeet al. 2015, A&A, 581, A28), and compare them with previously published values for the Sun and for other stellar EUV and white-light samples. We demonstrate the importance of applying appropriate corrections, especially in regard to the total, effective size of the stellar sample. Our results are broadly consistent with rates reported in the literature for Kepler white-light flares from solar-type stars, and with extrapolations of solar flare rates, indicating the potential of stellar X-ray flare observations to address issues such as ‘space weather’ in exoplanetary systems and our own solar system.

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