منابع مشابه
Lyman continuum as a diagnostic for nonthermal processes in solar flares
We have computed the Lyman continuum intensities for different flare circumstances, namely, the temperature rise in the chromosphere, the downward shift of the transition region, and the nonthermal effect of a precipitating beam of electrons. All the three factors can enhance the intensity by various amounts. The third effect additionally lowers the color temperature of the Lyman continuum. It ...
متن کاملSpectral Hardening in Large Solar Flares
Observations by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI) are used to quantitatively study the hard X-ray evolution in 5 large solar flares selected for spectral hardening in the course of the event. The X-ray bremsstrahlung emission from non-thermal electrons is characterized by two spectroscopically distinct phases: impulsive and gradual. The impulsive phase usually consists ...
متن کاملEvidence that Synchrotron Emission from Nonthermal Electrons Produces the Increasing Submillimeter Spectral Component in Solar Flares
We investigate the origin of the increasing spectra observed at submillimeter wavelengths detected in the flare on 2 November 2003 starting at 17:17 UT. This flare, classified as an X8.3 and 2B event, was simultaneously detected by RHESSI and the Solar Submillimeter Telescope (SST) at 212 and 405 GHz. Comparison of the time profiles at various wavelengths shows that the submillimeter emission r...
متن کاملNumerical Study of Magnetic Reconnection Processes in Solar Flares
Preface W. F. Ames (1965) said " fluid mechanics is especially rich in nonlinearities ". In this sense, I might as well say " Magnetohydrodynamics (MHD) is much richer ". Such rich nonlinearities bring about not only infinite research interest, but also enormous difficulty in mathematically treating them. Numerical simulation provides a powerful approach to overcome the difficulty and to invest...
متن کاملExternal Compton Radiation from Rapid Nonthermal Flares in Blazars
In this paper we extend our approach to modeling multifrequency emission variability from blazars to include external-radiation Compton (ERC) emission and electron energy losses from inverse Compton scattering of seed photons originating outside the jet. We consider seed-photon emission from a dusty molecular torus and the broad line region (BLR) surrounding the central engine. We establish con...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1975
ISSN: 0074-1809
DOI: 10.1017/s0074180900071862