Temporal evolution of bremsstrahlung dominated gamma-ray spectra of solar flares

1994 ◽  
Author(s):  
H. Marschhäuser ◽  
E. Rieger ◽  
G. Kanbach
Keyword(s):  
Solar Flares ◽  
Gamma Ray ◽  
Temporal Evolution

scholarly journals Gamma-ray lines and neutrons from solar flares

Solar Physics ◽  
1983 ◽  
Vol 86 (1-2) ◽  
pp. 395-408 ◽  
Author(s):  
R. Ramaty ◽  
R. J. Murphy ◽  
B. Kozlovsky ◽  
R. E. Lingenfelter
Keyword(s):  
Solar Flares ◽  
Gamma Ray

Detector and imaging systems for the gamma-ray imager/polarimeter for solar flares (GRIPS) instrument

2013 ◽  
Author(s):  
Nicole Duncan ◽  
Albert Shih ◽  
Gordon Hurford ◽  
Pascal Saint-Hilaire ◽  
Andreas Zoglauer ◽  
...  
Keyword(s):  
Solar Flares ◽  
Gamma Ray ◽  
Imaging Systems

scholarly journals Gamma-rays from Solar Flares

2000 ◽  
Vol 195 ◽  
pp. 123-132 ◽  
Author(s):  
R. Ramaty ◽  
N. Mandzhavidze
Keyword(s):  
Energy Release ◽  
Gamma Rays ◽  
Solar Flares ◽  
Gamma Ray ◽  
Particle Interaction ◽  
Mass Motion ◽  
Relativistic Electrons ◽  
Total Energy Release ◽  
Flare Energy ◽  
Accelerated Particles

Gamma-ray emission is the most direct diagnostic of energetic ions and relativistic electrons in solar flares. Analysis of solar flare gamma-ray data has shown: (i) ion acceleration is a major consequence of flare energy release, as the total flare energy in accelerated particles appears to be equipartitioned between ≳ 1 MeV/nucleon ions and ≳ 20 keV electrons, and amounts to an important fraction of the total energy release; (ii) there are flares for which over 50% of the energy is in a particles and heavier ions; (iii) in both impulsive and gradual flares, the particles that interact at the Sun and produce gamma rays are essentially always accelerated by the same mechanism that operates in impulsive flares, probably stochastic acceleration through gyroresonant wave particle interaction; and (iv) gamma-ray spectroscopy can provide new information on solar abundances, for example the site of the FIP-bias onset and the photospheric 3He abundance. We propose a new technique for the investigation of mass motion and mixing in the solar atmosphere: the observations of gamma-ray lines from long-term radioactivity produced by flare accelerated particles.

Study of Solar Flares and Gamma-Ray Bursts in the Helicon Experiment

2013 ◽  
pp. 393-403 ◽  
Author(s):  
E. P. Mazets ◽  
R. L. Aptekar ◽  
S. V. Golenetskii ◽  
V. N. Il’inskii ◽  
V. D. Pal’shin ◽  
...  
Keyword(s):  
Solar Flares ◽  
Gamma Ray ◽  
Gamma Ray Bursts

scholarly journals Millimeter and Microwave Activity of the Sun

1990 ◽  
Vol 142 ◽  
pp. 457-465 ◽  
Author(s):  
M. R. Kundu ◽  
S. M. White
Keyword(s):  
Magnetic Field ◽  
Gamma Rays ◽  
Solar Flares ◽  
Gamma Ray ◽  
High Spatial Resolution ◽  
High Resolution Imaging ◽  
The Sun ◽  
Millimeter Wavelengths ◽  
Resolution Imaging ◽  
The Magnetic Field

The emission of solar flares at millimeter wavelengths is of great interest both in its own right and because it is generated by the energetic electrons which also emit gamma rays. Since high-resolution imaging at gamma-ray energies is not presently possible, millimeter observations can act as a substitute. Except for that class of flares known as gamma-ray flares the millimetric emission is optically thin. It can be used as a powerful diagnostic of the energy distribution of electrons in solar flares and its evolution, and of the magnetic field. We have carried out high-spatial-resolution millimeter observations of solar flares this year using the Berkeley-Illinois-Maryland Array (BIMA), and report on the preliminary results in this paper (Kundu et al 1990; White et al 1990). We also report some recent results obtained from multifrequency observations using the VLA (White et al 1990).

scholarly journals COMPTEL gamma ray and neutron measurements of solar flares

1993 ◽  
Author(s):  
J. Ryan ◽  
D. Forrest ◽  
J. Lockwood ◽  
M. Loomis ◽  
M. McConnell ◽  
...  
Keyword(s):  
Solar Flares ◽  
Gamma Ray

Gamma-ray emission and electron acceleration in solar flares

1994 ◽  
Vol 434 ◽  
pp. 747 ◽  
Author(s):  
Vahe Petrosian ◽  
James M. McTiernan ◽  
Holger Marschhauser
Keyword(s):  
Solar Flares ◽  
Gamma Ray ◽  
Electron Acceleration ◽  
Gamma Ray Emission

scholarly journals Particle Acceleration in Solar Flares and Coronal Mass Ejections

2000 ◽  
Vol 195 ◽  
pp. 15-25
Author(s):  
R. P. Lin
Keyword(s):  
Particle Acceleration ◽  
Energy Release ◽  
Coronal Mass Ejections ◽  
Solar Flares ◽  
Gamma Ray ◽  
Solar Energetic Particle ◽  
High Energy ◽  
Total Rate ◽  
Solar Energetic Particle Events ◽  
High Energy Particles

The Sun accelerates ions up to tens of GeV and electrons up to 100s of MeV in solar flares and coronal mass ejections. The energy in the accelerated tens-of-keV electrons and possibly ~1 MeV ions constitutes a significant fraction of the total energy released in a flare, implying that the particle acceleration and flare energy release mechanisms are intimately related. The total rate of energy release in transients from flares down to microflares/nanoflares may be significant for heating the active solar corona.Shock waves driven by fast CMEs appear to accelerate the high-energy particles in large solar energetic particle events detected at 1 AU. Smaller SEP events are dominated by ~1 to tens-of-keV electrons, with low fluxes of up to a few MeV/nucleon ions, typically enriched in 3He. The acceleration in gamma-ray flares appears to resemble that in these small electron-3He SEP events.

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