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Author : Todd Alan Gunkler
Publisher :
ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.:/5 (791 download)
Download or read book Observations and Analysis of Solar Flares Using H[alpha] Spectral Profiles written by Todd Alan Gunkler and published by . This book was released on 1987 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Todd Alan Gunkler
Publisher :
ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.:/5 (131 download)
Download or read book Observations and Analysis of Solar Flares Using Hα Spectral Profiles written by Todd Alan Gunkler and published by . This book was released on 1984 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Todd Alan Gunkler
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.:/5 (757 download)
Download or read book Observations and Analysis of Solar Flares Using Ha Spectral Profiles written by Todd Alan Gunkler and published by . This book was released on 1985 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Observations and Analysis of Solar Flares Using H[alpha] Spectral Profiles PDF Online Free](https://books.google.com/books/content/images/frontcover/XNdAAQAAIAAJ?fife=w200-h370)
Author : Todd Alan Gunkler
Publisher :
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.:/5 (318 download)
Download or read book Observations and Analysis of Solar Flares Using H[alpha] Spectral Profiles written by Todd Alan Gunkler and published by . This book was released on 1984 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Guangli Huang
Publisher : Springer
ISBN 13 : 9811028699
Total Pages : 437 pages
Book Rating : 4.8/5 (11 download)
Download or read book Solar Flare Loops: Observations and Interpretations written by Guangli Huang and published by Springer. This book was released on 2018-01-31 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides results of analysis of typical solar events, statistical analysis, the diagnostics of energetic electrons and magnetic field, as well as the global behavior of solar flaring loops such as their contraction and expansion. It pays particular attention to analyzing solar flare loops with microwave, hard X-ray, optical and EUV emissions, as well as the theories of their radiation, and electron acceleration/transport. The results concerning influence of the pitch-angle anisotropy of non-thermal electrons on their microwave and hard X-ray emissions, new spectral behaviors in X-ray and microwave bands, and results related to the contraction of flaring loops, are widely discussed in the literature of solar physics. The book is useful for graduate students and researchers in solar and space physics.
Author :
Publisher :
ISBN 13 :
Total Pages : 836 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Markus Aschwanden
Publisher : Springer Science & Business Media
ISBN 13 : 9401725411
Total Pages : 233 pages
Book Rating : 4.4/5 (17 download)
Download or read book Particle Acceleration and Kinematics in Solar Flares written by Markus Aschwanden and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last decade we entered a new exploration phase of solar flare physics, equipped with powerful spacecraft such as Yohkoh, SoHO, and TRACE that pro vide us detail-rich and high-resolution images of solar flares in soft X-rays, hard X -rays, and extreme-ultraviolet wavelengths. Moreover, the large-area and high sensitivity detectors on the Compton GRO spacecraft recorded an unprecedented number of high-energy photons from solar flares that surpasses all detected high energy sources taken together from the rest of the universe, for which CGRO was mainly designed to explore. However, morphological descriptions of these beau tiful pictures and statistical catalogs of these huge archives of solar data would not convey us much understanding of the underlying physics, if we would not set out to quantify physical parameters from these data and would not subject these measurements to theoretical models. Historically, there has always been an unsatisfactory gap between traditional astronomy that dutifully describes the mor phology of observations, and the newer approach of astrophysics, which starts with physical concepts from first principles and analyzes astronomical data with the goal to confirm or disprove theoretical models. In this review we attempt to bridge this yawning gap and aim to present the recent developments in solar flare high-energy physics from a physical point of view, structuring the observations and analysis results according to physical processes, such as particle acceleration, propagation, energy loss, kinematics, and radiation signatures.
Author : Delos C. Jensen
Publisher :
ISBN 13 :
Total Pages : 458 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Statistical Summary of Solar Flare Reports and Observatory Practices for the Period 1955-1964 written by Delos C. Jensen and published by . This book was released on 1967 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a summary of the ten years (1955-1964) of observations of solar flares reported by 61 observatories. The flare reports have been published predominantly in the IAU Bulletin and CRPL-F Series Part B. This report summarizes the types of information contained in the flare reports, and the frequency of some parts of these reports as functions of many parameters. The results reflect the need for closer cooperation and coordination of participating observatories in recording and reporting solar flare data.
Author : Marina Battaglia
Publisher : Cuvillier Verlag
ISBN 13 : 3736928807
Total Pages : 162 pages
Book Rating : 4.7/5 (369 download)
Download or read book Particle kinematics in solar flares: observations and theory written by Marina Battaglia and published by Cuvillier Verlag. This book was released on 2009-02-05 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is devoted to the study of particle acceleration and propagation processes in solar flares. Solar flares are amongst the most powerful and energetic activity phenomena our Sun exhibits. They release energy of the order of 1032 erg in seconds to minutes. In the process, electrons and protons are accelerated to relativistic energies, making flares very efficient particle accelerators. The most compelling observational signatures of flares can be found in X-rays and extreme ultra-violet wavelengths. Due to atmospheric absorption, those wavelengths can only be studied from space. Since the beginning of the space age, countless flares have been observed by satellites. The present work is largely based on observations by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI), an X-ray satellite which has been observing the Sun since February 2002. It is a NASA mission with substantial Swiss hardware and software contribution. Using RHESSI observations of flares of different intensity, a deeper understanding of the particle transport and energy transport processes in flare loops, as well as the acceleration site and acceleration mechanism is sought. The time evolution of images and spectra is studied along with the quantitative relations between X-ray sources observed in the corona (coronal sources) and from the chromosphere (footpoints). The spectral relations found between coronal sources and footpoints are compared to the so-called ``intermediate thin-thick target model'', which was based on observations by the satellite Yohkoh. We show that the spectral relations between coronal sources and footpoints observed with RHESSI cannot be explained by the intermediate thin-thick target model. In a next step, return currents in the flare loop were considered. With this extension to the existing model, the spectra of the coronal source and the footpoints, as well as the relations between them can be explained, indicating the importance of return currents in flare loops. In a second part, observations of so-called ``pre-flares'' are presented. This earliest phase of a flare cannot be explained by the standard flare model of chromospheric evaporation which involves energy transport and deposition in the chromosphere by beams of accelerated electrons. In pre-flares, an increase in density and emission measure is observed, indicating that chromospheric evaporation is occurring. However, no observational signatures of fast electrons are found. We show that if energy is transported by means of thermal conduction instead of an electron beam, the observations can explained.
Author : Therese Ann Kucera
Publisher :
ISBN 13 :
Total Pages : 344 pages
Book Rating : 4.:/5 (343 download)
Download or read book Observations and Analysis of Solar Flares at Radio and Other Wavelengths written by Therese Ann Kucera and published by . This book was released on 1993 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zdenek Svestka
Publisher : Springer Science & Business Media
ISBN 13 : 9401014590
Total Pages : 414 pages
Book Rating : 4.4/5 (1 download)
Download or read book Solar Flares written by Zdenek Svestka and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first part of the originally planned publication by Z. Svestka and L. D. de Feiter 'Solar High Energy Photon and Particle Emission'. The second part, with the original title, was to be published by de Feiter in about one year from now. However, to the deep sorrow of all of us, Dr de Feiter died suddenly and unexpectedly when the present book was in print. Thus, unfortunately, de Feiter's second part may not appear. Due to the fact that the originally planned publication was divided into two parts, the present book is mainly descriptive and concerned with the flare morphology. It was expected that theoretical interpretations would be extensively developed in the second part, prepared by de Feiter. In particular, this refers to the theoretical back grounds of radio emissions, particle acceleration and particle propagation in space. Only in Chapter II, concerning the 'low-temperature' flare, do we go deeper into the theoretical interpretations, anticipating that de Feiter would have been concerned mainly with the 'high-energy' physics. Still, the book includes discussions on all important aspects of flares and thus can present the reader with a complete picture of the complex flare phenomenon. It is clear that many observed data on flares can be interpreted in different ways.
Author : John C. Brown
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (227 download)
Download or read book H-Alpha Profiles from Electron-Heated Solar Flares written by John C. Brown and published by . This book was released on 1978 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Review briefly the status of models of optical flare heating by electron bombardment. Recompute a flare model atmosphere using considerably revised radiative loss rates, based on a method applied to H-alpha, Lyman-alpha, and H( - ). Profiles of H-alpha are computed and compared with observation. The computed profiles agree satisfactorily with those observed during the large 1972 August 7 flare, if spatial and velocity inhomogeneities are assumed. The electron injection rate inferred from H-alpha is one order of magnitude less than that inferred from hard X-rays, for this event. This may be due to either the neglect of a mechanism that reduces the thick-target electron injection rate or failure to incorporate important radiative loss terms.
Author : Leendert Dirk de Feiter
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (26 download)
Download or read book Analysis of the Balmer Spectrum of Solar Flares. Proefschrift, Etc written by Leendert Dirk de Feiter and published by . This book was released on 1966 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S.R. Kane
Publisher : Springer Science & Business Media
ISBN 13 : 9400972288
Total Pages : 451 pages
Book Rating : 4.4/5 (9 download)
Download or read book Recent Advances in the Understanding of Solar Flares written by S.R. Kane and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: These Proceedings result from the papers and discussions of the U.S.-Japan Seminar "Recent Advances in the Understanding of Solar Flares" held in Tokyo October 5-8, 1982. The meeting was sponsored jointly by the Japan Society for the Promotion of Science and the u.S. National Science Foundation. The principal aim of the meeting was to obtain the most up-to-date physical picture of solar flares by bringing together results from the recent observations by the Solar Maximum Mission (SMM) and HINOTORI satellites, together with other satellite data and ground-based data at both optical and radio wavelengths. These data cover the recent maximum of the solar activity cycle. The SMM and HINOTORI introduced a new dimension in flare observations by carrying out the first hard X-ray imaging observations, and the organizers especially felt that an intense discussion of the significance of these results in the context of flare theories would be important. Starting with an introductory presentation of the characteristics of the instruments on board the satellites, the sessions of the first day and the beginning of the second dealt mainly with energy transport in flares and with .the formation process of the hot plasma which is .
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722824655
Total Pages : 42 pages
Book Rating : 4.8/5 (246 download)
Download or read book Studying the Thermal/Non-Thermal Crossover in Solar Flares written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes work performed under contract NAS5-32584 for Phase 3 of the Compton Gamma Ray Observatory (CGRO) from 1 November 1993 through 1 November 1994. We have made spectral observations of the hard x-ray and gamma-ray bremsstrahlung emissions from solar flares using the Burst and Transit Source Experiment (BASTE) on CGRO. These measurements of their spectrum and time profile provided valuable information on the fundamental flare processes of energy release, particle acceleration, and energy transport. Our scientific objective was to study both the thermal and non-thermal sources of solar flare hard x-ray and gamma-ray emission. Schwartz, R. A. Unspecified Center NAS5-32584...
Author : Mutsumi Ishitsuka
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (227 download)
Download or read book Preliminary Measurement of H-alpha Flare Spectrograms written by Mutsumi Ishitsuka and published by . This book was released on 1963 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A spectrograph for observing solar flare spectra is being built. With the spectrograph, twenty two spectrograms were taken successively with short time intervals, in a narrow spectral region centered in the gydrogen H-alpha line, throughout a solar flare event detected on September 7, 1962. Six of those spectrograms were traced with a microphoto meter, hence the profiles obtained shown in this note. On the other hand, three spectrograms covering the same spectral region, obtained from the normal region of the sun, were traced with the microphotometer. The resultant observed profile was compared with the profile mentioned on the Utrecht Atlas, for the purpose of estimating roughly the certainty of the obtained spectrograms. The existence of considerable stray light in the spectrograph was also deuduced. The ratio of the equivalent width of H-alpha line in the normal observed profile to that of the Utrecht profile amounted to 0.80. (Author).
Author : Hermine Vloemans
Publisher : Springer Science & Business Media
ISBN 13 : 9401022313
Total Pages : 308 pages
Book Rating : 4.4/5 (1 download)
Download or read book Ionospheric Effects of Solar Flares written by Hermine Vloemans and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sudden Ionospheric Disturbances resulting from an interaction of the Solar Flare radiation with the constituents of the upper atmosphere constitute one of the three major aspects of ground level monitoring of solar flares -the other two being optical observations of flares, and the observations of solar bursts in radio wavelengths. SIDs, therefore, form a major part of flare monitoring programme in many observatories. Unlike the other two, however, the ionospheric effects of flares provide one major additional source of interest - the reaction of the ionospheric plasma to an impulsive ionization. The high atmosphere provides a low pressure laboratory without walls in which a host of reactions occur between electrons, ions and neutral particles. The resulting products and their distributions may bear no resemblance to those of the primary neutral constituents or their direct ionization products. The variations with the time of the day, with season and with solar activity that form the bulk of the ionospheric measurements are too slow to allow any insight into the nature of these ionospheric reactions whose lifetimes are often very short. The relaxation time of the ionospheric ionization is only a few minutes or fraction of a minute in the lower ionosphere and in the E-region and is about 30 min to an hour at 300 km. The flares provide a sudden short impulse comparable to these time scales.
