The decay phase of solar flare events

Solar Physics ◽  
1971 ◽  
Vol 18 (1) ◽  
pp. 100-132 ◽  
Author(s):  
K. G. McCracken ◽  
U. R. Rao ◽  
R. P. Bukata ◽  
E. P. Keath
Keyword(s):  
Solar Flare ◽  
Decay Phase

scholarly journals The escape of trapped electrons in the decay phase of solar flare

2012 ◽  
Vol 8 (S294) ◽  
pp. 153-154
Author(s):  
Jing Huang
Keyword(s):  
Solar Flare ◽  
Solar Flares ◽  
Pitch Angle ◽  
Escape Rate ◽  
Decay Phase ◽  
Coulomb Collision ◽  
Energetic Electrons ◽  
Trapped Electrons ◽  
Flare Loops ◽  
Angle Scattering

AbstractFrom the observations of radio and HXR bursts, the escape rate of energetic electrons trapped in the flare loops is studied based on the trap-plus-precipitation model for the kinematics of energetic electrons in solar flares. Coulomb collision is regarded as the main pitch angle scattering of trapped electrons in the decay phase of the event on 2004 December 1. The escape rate of trapped electrons decreases firstly and then increases, which indicates the evolution of the plasma density in the flare loops during the decay phase.

Cosmic ray anisotropies observed late in the decay phase of solar flare events

Solar Physics ◽  
1974 ◽  
Vol 38 (1) ◽  
pp. 227-256 ◽  
Author(s):  
F. R. Allum ◽  
R. A. R. Palmeira ◽  
K. G. McCracken ◽  
U. R. Rao ◽  
D. H. Fairfield ◽  
...  
Keyword(s):  
Solar Flare ◽  
Cosmic Ray ◽  
Decay Phase

scholarly journals The morphology of average solar flare time profiles from observations of the Sun’s lower atmosphere

2021 ◽  
Vol 502 (3) ◽  
pp. 3922-3931
Author(s):  
Larisa K Kashapova ◽  
Anne-Marie Broomhall ◽  
Alena I Larionova ◽  
Elena G Kupriyanova ◽  
Ilya D Motyk
Keyword(s):  
Solar Flare ◽  
Power Law ◽  
Solar Flares ◽  
Lower Atmosphere ◽  
Decay Phase ◽  
Dense Layer ◽  
Time Profiles ◽  
Spectral Bands ◽  
The Impact ◽  
M Dwarf

ABSTRACT We study the decay phase of solar flares in several spectral bands using a method based on that successfully applied to white light flares observed on an M4 dwarf. We selected and processed 102 events detected in the Sun-as-a-star flux obtained with SDO/AIA images in the 1600 and 304 Å channels and 54 events detected in the 1700 Å channel. The main criterion for the selection of time profiles was a slow, continuous flux decay without significant new bursts. The obtained averaged time profiles were fitted with analytical templates, using different time intervals, that consisted of a combination of two independent exponents or a broken power law. The average flare profile observed in the 1700 Å channel decayed more slowly than the average flare profile observed on the M4 dwarf. As the 1700 Å emission is associated with a similar temperature to that usually ascribed to M dwarf flares, this implies that the M dwarf flare emission comes from a more dense layer than solar flare emission in the 1700 Å band. The cooling processes in solar flares were best described by the two exponents model, fitted over the intervals t1 = [0, 0.5]t1/2 and t2 = [3, 10]t1/2, where t1/2 is time taken for the profile to decay to half the maximum value. The broken power-law model provided a good fit to the first decay phase, as it was able to account for the impact of chromospheric plasma evaporation, but it did not successfully fit the second decay phase.

Solar Flare Energetic Neutral Emission Measurements in the Project Coronas-I

1994 ◽  
Vol 144 ◽  
pp. 635-639
Author(s):  
J. Baláž ◽  
A. V. Dmitriev ◽  
M. A. Kovalevskaya ◽  
K. Kudela ◽  
S. N. Kuznetsov ◽  
...  
Keyword(s):  
Solar Flare ◽  
Energy Range ◽  
Gamma Rays ◽  
Pulse Shape ◽  
Gamma Ray ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Solar Neutron ◽  
Low Altitude

AbstractThe experiment SONG (SOlar Neutron and Gamma rays) for the low altitude satellite CORONAS-I is described. The instrument is capable to provide gamma-ray line and continuum detection in the energy range 0.1 – 100 MeV as well as detection of neutrons with energies above 30 MeV. As a by-product, the electrons in the range 11 – 108 MeV will be measured too. The pulse shape discrimination technique (PSD) is used.

HIGH DIELECTRONIC SATELLITE LINES IN SOLAR FLARE SPECTRA

1979 ◽  
Vol 40 (C1) ◽  
pp. C1-98-C1-101
Author(s):  
L. Steenman-Clark ◽  
F. Bely Dubau ◽  
J. Dubau ◽  
P. Faucher ◽  
A. H. Gabriel ◽  
...  
Keyword(s):  
Solar Flare ◽  
Dielectronic Satellite
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