Impulsive and Extended Acceleration in the 1977 November 6 Solar Flare
نویسندگان
چکیده
Yohkoh observed strong gamma-ray emission from a flare (X9.4/2B) on November 6, 1997. The emission was impulsive and lasted for about 4 min (11:52-11:56 UT). The spectrum exhibits gamma-ray lines and extends up to a few tens of MeV The Oriented Scintillation Spectrometer Experiment (OSSE) on board the Compton Gamma-Ray Observatory (CGRO) missed the peak phase of gamma-ray flare but detected significant solar neutrons between 12:08 and 12:28 UT. In order to explain the OSSE neutron time profile, we propose an extended neutron production. We find a continued gamma-ray production after the peak phase from the Yohkoh result, supporting our proposal. We discuss the possibility that particle acceleration is associated with a magnetic reconnection and its site moves up with time. © 2002 COSPAR. Published by Elsevier Science Ltd. All rights reserved.
منابع مشابه
Periodic Acceleration of Electrons in the 1998 November 10 Solar Flare
We present an examination of the multi-wavelength observation of a C7.9 flare which occurred on 1998 November 10. This is the first time of imaging observation of the quasi-periodic pulsations (QPPs). Four bursts were observed with the hard X-ray telescope aboard Yohkoh and the Nobeyama Radioheliograph during the impulsive phase of the flare. In the second burst, the hard X-ray and microwave ti...
متن کاملRadio Spectral Evolution of an X-ray Poor Impulsive Solar Flare: Implications for Plasma Heating and Electron Acceleration
We present radio and X-ray observations of an impulsive solar flare that was moderately intense in microwaves, yet showed very meager EUV and Xray emission. The flare occurred on 2001 Oct 24 and was well-observed at radio wavelengths by the Nobeyama Radioheliograph (NoRH), the Nobeyama Radio Polarimeters (NoRP), and by the Owens Valley Solar Array (OVSA). It was also observed in EUV and X-ray w...
متن کاملکاربرد الگوریتم ژنتیک و ماشین بردار پشتیبان در جستجوی پارامترهای نانوشرارههای تاج خورشید
Nanoflares are the small impulsive sudden energy releases, due to the explosion of solar background. Thus, determination of their energies and distributions is important . Recent observations and simulation models have shown that the frequency of their energies follows power-law. According to Parker hypothesis, if these exponents are greater than critical value 2, the contributions of nanofla...
متن کاملThe shock reprocessing model of electron acceleration in impulsive solar flares
We propose a new two-stage model for acceleration of electrons in solar flares. In the first stage, electrons are accelerated stochastically in a post-reconnection turbulent downflow. The second stage is the reprocessing of a subset of these electrons as they pass through a weakly compressive fast shock above the apex of the closed flare loop on their way to the chromosphere. We call this the "...
متن کاملOnsets and spectra of impulsive solar energetic electron events observed near the Earth
Impulsive solar energetic electrons are often observed in the interplanetary space near the Earth and have an attractive diagnostic potential for poorly understood solar flare acceleration processes. We investigate the transport of solar flare energetic electrons in the heliospheric plasma to understand the role of transport to the observed onset and spectral properties of the impulsive solar e...
متن کامل