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Author : James Michael McTiernan
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.F/5 ( download)
Download or read book Numerical Simulations of X-rays and Gamma-rays from Solar Flares written by James Michael McTiernan and published by . This book was released on 1989 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jennifer A. Pollock
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.:/5 (244 download)
Download or read book Numerical Simulations of Radiation and Heating from Non-thermal Electrons in Solar Flares written by Jennifer A. Pollock and published by . This book was released on 2008 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Paul Thomas Feffer
Publisher :
ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.:/5 (34 download)
Download or read book X-ray and Gamma-ray Observations of Solar Flares written by Paul Thomas Feffer and published by . This book was released on 1996 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John Leach
Publisher :
ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.F/5 ( download)
Download or read book The Impulsive Hard X-rays from Solar Flares written by John Leach and published by . This book was released on 1984 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Adm Nasa
Publisher :
ISBN 13 : 9781728728674
Total Pages : 34 pages
Book Rating : 4.7/5 (286 download)
Download or read book The Hard X-Rays and Gamma-Rays from Solar Flares written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-10-12 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radiation of energies from 10 KeV to greater than 10 MeV has been observed during solar flares, and is interpreted to be due to bremsstrahlung by relativistic electrons. A complete treatment of this problem requires solution of the kinetic equation for relativistic electrons and inclusion of synchrotron energy losses. Using the electron distributions obtained from numerical solutions of this equation the bremsstrahlung spectra in the impulsive x ray and gamma-ray regimes are calculated, and the variation of these spectral indices and directivities with energy and observation angle are described. The dependences of these characteristics of the radiation of changes in the solar atmospheric model, including the convergence of the magnetic field, the injected electron spectral index, and most importantly, in the anisotropy of the injected electrons and of the convergence of the magnetic field are also described. The model results are compared with stereoscopic observations of individual flares and the constraints that this data sets on the models are discussed. Mctiernan, James M. and Petrosian, Vahe Unspecified Center NSF ATM-83-20439; NSG-7092...
Author : Wei Liu
Publisher :
ISBN 13 : 9783836474320
Total Pages : 252 pages
Book Rating : 4.4/5 (743 download)
Download or read book Solar Flares As Natural Particle Accelerators written by Wei Liu and published by . This book was released on 2008-07-01 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar flares, which have significant space weather consequences, are natural particle accelerators and one of the most spectacular phenomena of solar activity. RHESSI is the most advanced solar X-ray and gamma-ray mission ever flown and has opened a new era in solar flare research following its launch in 2002. This book offers a glimpse of this active research area from a high-energy perspective and contains a comprehensive guideline for RHESSI data analysis. Its main theme is the investigation of particle acceleration and transport in solar flares. The strength of this book lies in its well-balanced account of the latest X-ray observations and theoretical models. The observational focus is on the morphology and spectra of imaged X-ray sources produced by nonthermal electrons or hot plasma. The modeling takes the novel approach of combining the Fokker-Planck treatment of the accelerated particles with the hydrodynamic treatment of the heated atmosphere. Applications of this modeling technique reach beyond the Sun to other exotic environments in the universe, such as extrasolar planetary auroras, stellar flares, and flares on accretion disks around neutron stars and black holes.
Author : Herbert J. Wiehl
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (317 download)
Download or read book Great Microwave Bursts and Hard X Rays from Solar Flares written by Herbert J. Wiehl and published by . This book was released on 1983 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720944126
Total Pages : 44 pages
Book Rating : 4.9/5 (441 download)
Download or read book Solar Flare Physics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past year we have been working with the HESSI (High Energy Solar Spectroscopic Imager) team in preparation for launch in early 2001. HESSI has as its primary scientific goal photometric imaging and spectroscopy of solar flares in hard X-rays and gamma-rays with an approx. 2 sec angular resolution, approx. keV energy resolution and approx. 2 s time resolution over the 6 keV to 15 MeV energy range. We have performed tests of the imager using a specially designed experiment which exploits the second-harmonic response of HESSI's sub-collimators to an artificial X-ray source at a distance of 1550 cm from its front grids. Figures show the response to X-rays at energies in the range where HESSI is expected to image solar flares. To prepare the team and the solar user community for imaging flares with HESSI, we have written a description of the major imaging concepts. This paper will be submitted for publication in a referred journal.Schmahl, Edward J. and Kundu, Mukul R.Goddard Space Flight CenterGAMMA RAYS; X RAYS; SOLAR FLARES; GAMMA RAY ASTRONOMY; X RAY ASTRONOMY; PHOTOMETRY; SPECTROSCOPY; PERFORMANCE TESTS; X RAY SOURCES; MODULATION
Author :
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.3/5 (91 download)
Download or read book MAX '91 written by and published by . This book was released on 1988 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard Frank Donnelly
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.0/5 ( download)
Download or read book Contribution of X-ray and Extreme Ultraviolet Radiation of Solar Flares to Sudden Frequency Deviations written by Richard Frank Donnelly and published by . This book was released on 1969 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: High time and intensity resolution satellite measurements of X-ray and extreme ultraviolet (EUV) radiation during solar flares are studied to determine the wavelength dependence of the flare radiation responsible for sudden frequency deviations (SFD). SFD's measure the flare-induced effects in the E and F1 regions of the ionosphere and are in effect like a broadband (1-1030 Å) detector for impulsive flare enhancements. He II 303.8 Å, O V 629.7 Å, H Ly [upsilon] 972.5 Å, C III 977.0 Å, and H Ly [alpha] 1215.7 Å were found to have essentially the same time dependence as the total ionizing radiation producing SFD's, except that they decay faster than the net 1-1030 Å radiation. Flare enhancements of Fe XV 284.1 Å, Fe XVI 335.3 Å, Si XII 499.3 Å. Mg X 625.3 Å, and Ne VIII 770.4 Å, which are normally coronal lines, appear to have a much slower time dependence than the radiation responsible for SFD's. X-rays in the 0.5-3 Å range are slightly slower than the radiation responsible for SFD's during the decay stage; 1-8 Å X-ray flares are slower, especially during the decay stages; and 8-20 Å flare radiation enhancements are slower throughout the entire SFD.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722041342
Total Pages : 34 pages
Book Rating : 4.0/5 (413 download)
Download or read book Acceleration of Electrons and Ions by Strong Lower-Hybrid Turbulence in Solar Flares written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-29 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the outstanding problems in solar flare theory is how to explain the 10-20 keV and greater hard x-ray emissions by a thick target bremsstrahlung model. The model requires the acceleration mechanism to accelerate approximately 10(exp 35) electrons sec(exp -l) with comparable energies, without producing a large return current which persists for long time scales after the beam ceases to exist due to Lenz's law, thereby, producing a self-magnetic field of order a few mega-Gauss. In this paper, we investigate particle acceleration resulting from the relaxation of unstable ion ring distributions, producing strong wave activity at the lower hybrid frequency. It is shown that strong lower hybrid wave turbulence collapses in configuration space producing density cavities containing intense electrostatic lower hybrid wave activity. The collapse of these intense nonlinear wave packets saturate by particle acceleration producing energetic electron and ion tails. There are several mechanisms whereby unstable ion distributions could be formed in the solar atmosphere, including reflection at perpendicular shocks, tearing modes, and loss cone depletion. Numerical simulations of ion ring relaxation processes, obtained using a 2 1/2-D fully electromagnetic, relativistic particle in cell code are discussed. We apply the results to the problem of explaining energetic particle production in solar flares. The results show the simultaneous acceleration of both electrons and ions to very high energies: electrons are accelerated to energies in the range 10-500 keV, while ions are accelerated to energies of the order of MeVs, giving rise to x-ray emission and gamma-ray emission respectively. Our simulations also show wave generation at the electron cyclotron frequency. We suggest that these waves are the solar millisecond radio spikes. The strong turbulence collapse process leads to a highly filamented plasma producing many localized regions for particle acceleration and resulting in ...
Author :
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (31 download)
Download or read book Dynamic Evolution of the Source Volumes of Gradual and Impulsive Solar Flare Emissions written by and published by . This book was released on 1987 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yutaka Uchida
Publisher : Springer Science & Business Media
ISBN 13 : 9780792341765
Total Pages : 664 pages
Book Rating : 4.3/5 (417 download)
Download or read book Magnetodynamic Phenomena in the Solar Atmosphere written by Yutaka Uchida and published by Springer Science & Business Media. This book was released on 1996-09-30 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: These are the Proceedings of Colloquium No. 153 of the International Astro nomical Union, held at Makuhari near Tokyo on May 22 - 26, 1995, and hosted by the National Astronomical Observatory. This meeting was intended to be an interdisciplinary meeting between re searchers of solar and stellar activity, in order for them to exchange the newest information in each field. While each of these areas has seen remarkable advances in recent years, and while the researchers in each field have felt that information from the other's domain would be extremely useful in their own work, there have not been very many opportunities for intensive exchanges of information between these closely related fields. We therefore expected much from this meeting in pro viding stellar researchers with new results of research on the counterparts of their targets of research, spatially and temporarily resolved, as observed on the Sun. Likewise we hoped to provide solar researchers with new results on gigantic ver sions of their targets of research under the very different physical circumstances on other active stars. It was our greatest pleasure that we had wide attendance of experts and active researchers of both research fields from all over the world. This led to extremely interesting talks and very lively discussions, thereby stimulating the exchange of ideas across the fields.
Author : Thomas K. Gaisser
Publisher : Cambridge University Press
ISBN 13 : 9780521339315
Total Pages : 302 pages
Book Rating : 4.3/5 (393 download)
Download or read book Cosmic Rays and Particle Physics written by Thomas K. Gaisser and published by Cambridge University Press. This book was released on 1990 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over recent years there has been marked growth in interest in the study of techniques of cosmic ray physics by astrophysicists and particle physicists. Cosmic radiation is important for the astrophysicist because in the farther reaches of the universe. For particle physicists, it provides the opportunity to study neutrinos and very high energy particles of galactic origin. More importantly, cosmic rays constitue the background, and in some cases possibly the signal, for the more exotic unconfirmed hypothesized particles such as monopoles and sparticles. Concentrating on the highest energy cosmic rays, this book describes where they originate, acquire energy, and interact, in accreting neutron stars, supernova remnants, in large-scale shock waves. It also describes their interactions in the atmosphere and in the earth, how they are studied in surface and very large underground detectors, and what they tell us.
Author : Janice L. Bishop
Publisher : Cambridge University Press
ISBN 13 : 110718620X
Total Pages : 655 pages
Book Rating : 4.1/5 (71 download)
Download or read book Remote Compositional Analysis written by Janice L. Bishop and published by Cambridge University Press. This book was released on 2019-11-28 with total page 655 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive overview of the spectroscopic, mineralogical, and geochemical techniques used in planetary remote sensing.
Author : Richard Frank Donnelly
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.0/5 ( download)
Download or read book Early Detection of a Solar Flare written by Richard Frank Donnelly and published by . This book was released on 1968 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar X-ray, extreme ultraviolet, H[alpha] and radio emission were studies to determine what solar radiation is best suited for an automatic flare alarm system aboard a satellite for the detection of the start of a solar flare. Although hard X-rays ([lambda] “1 Å), centimeter-wavelength solar radio bursts, and flashes at certain EUV wavelengths usually have faster rise times and peak earlier than soft X-rays in the 2-16 Å range, the data available to date show that on the average the start time of the 2-16 Å X-rays occurs earlier than the start times for these other types of data. The early start times and large percentage increase of 2-16 Å X-rays make this radiation the best suited for the automatic detection of solar flares for the present state of the art of solar radiation measurements.
Author : F. Sánchez
Publisher : Cambridge University Press
ISBN 13 : 9780521402514
Total Pages : 274 pages
Book Rating : 4.4/5 (25 download)
Download or read book Solar Observations written by F. Sánchez and published by Cambridge University Press. This book was released on 1992 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Canary Islands Winter School Workshop in which four internationally respected scientists write on solar physics.
