High Resolution Solar Radio Activity Investigations
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High Resolution Solar Radio Activity Investigations
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Author : Ronald M. Straka
language : en
Publisher:
Release Date : 1977
High Resolution Solar Radio Activity Investigations written by Ronald M. Straka and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Power spectra categories.
The study of cm-mm wavelength radio emission from solar active regions to find flare/proton flare predictors was the task of AFGL's In-House Work Unit 46430302, High Resolution Solar Activity Investigations. Using mapping data from several large radio telescopes, the multi-wavelength active region data was evaluated for significant prediction parameters. A statistical examination of 681 solar-region measurements obtained at wavelengths of 9.1 cm (Stanford), 8 mm (AFCRL), and 3 mm (Aerospace) from 1968 to 1970 was made and related to 25 proton events. Of the 21 different correlation parameters evaluated, the apparent 3-mm flux density, particularly when it exceeded 10 s.f.u., provided the best indication that a region would produce a proton flare. Results of the 21 August 1975 proton-flare observations using the 120-ft Haystack radiotelescope at 3.8 cm are discussed. The solar region involved had a low, and decreasing, brightness temperature before it flared, and not the polarization variations often seen prior to flares. The noise power spectrum analysis of active-region temperature and polarization variations is described. A significant power component was found at 43 mHz (23 sec period) in preflare polarization variations; no such component was found for preflare temperature. Recommendations for future areas of investigation using high-resolution solar radio instrumentation are suggested. (Author).
High Resolution Solar Radio Activity Investigations
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Author : Ronald M. Straka
language : en
Publisher:
Release Date : 1977
High Resolution Solar Radio Activity Investigations written by Ronald M. Straka and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Power spectra categories.
The study of cm-mm wavelength radio emission from solar active regions to find flare/proton flare predictors was the task of AFGL's In-House Work Unit 46430302, High Resolution Solar Activity Investigations. Using mapping data from several large radio telescopes, the multi-wavelength active region data was evaluated for significant prediction parameters. A statistical examination of 681 solar-region measurements obtained at wavelengths of 9.1 cm (Stanford), 8 mm (AFCRL), and 3 mm (Aerospace) from 1968 to 1970 was made and related to 25 proton events. Of the 21 different correlation parameters evaluated, the apparent 3-mm flux density, particularly when it exceeded 10 s.f.u., provided the best indication that a region would produce a proton flare. Results of the 21 August 1975 proton-flare observations using the 120-ft Haystack radiotelescope at 3.8 cm are discussed. The solar region involved had a low, and decreasing, brightness temperature before it flared, and not the polarization variations often seen prior to flares. The noise power spectrum analysis of active-region temperature and polarization variations is described. A significant power component was found at 43 mHz (23 sec period) in preflare polarization variations; no such component was found for preflare temperature. Recommendations for future areas of investigation using high-resolution solar radio instrumentation are suggested. (Author)
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Solar Investigations
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Author : John Ericsson
language : en
Publisher:
Release Date : 1876
Solar Investigations written by John Ericsson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1876 with Solar radiation categories.
Multi Wavelength Investigations Of Solar Activity Iau S223
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Author : International Astronomical Union. Symposium
language : en
Publisher: Cambridge University Press
Release Date : 2004
Multi Wavelength Investigations Of Solar Activity Iau S223 written by International Astronomical Union. Symposium and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Science categories.
These Proceedings present the most recent results from the highly successful international solar space missions (SOHO, CORONAS-F, TRACE, RHESSI, YOHKOH) and ground observatories around the Earth, reported at the IAU Symposium 223 held in St. Petersburg, Russia, June 14-19, 2004. These include discussions of the current theories of solar dynamics and activity, new constraints provided by the multi-wavelength observations of the Sun from the interior to the heliosphere, as well as discussions of future coordinated plans and efforts of multi-wavelength investigations of the Sun. The Proceedings contain the material of seven plenary sessions and three round-table discussions
Investigations Of Local Regions Of Solar Radio Radiation By Polarization Observations In The Microwave Band
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Author : N. S. Soboleva
language : en
Publisher:
Release Date : 1960
Investigations Of Local Regions Of Solar Radio Radiation By Polarization Observations In The Microwave Band written by N. S. Soboleva and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with categories.
Investigations On Type 3 5 Bursts Of Solar Radio Emission
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Author : H. Daene
language : de
Publisher:
Release Date : 1965
Investigations On Type 3 5 Bursts Of Solar Radio Emission written by H. Daene and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with categories.
Hard X Ray Imaging Of Solar Flares
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Author : Michele Piana
language : en
Publisher: Springer
Release Date : 2022-12-23
Hard X Ray Imaging Of Solar Flares written by Michele Piana and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-12-23 with Computers categories.
The idea for this text emerged over several years as the authors participated in research projects related to analysis of data from NASA's RHESSI Small Explorer mission. The data produced over the operational lifetime of this mission inspired many investigations related to a specific science question: the when, where, and how of electron acceleration during solar flares in the stressed magnetic environment of the active Sun. A vital key to unlocking this science problem is the ability to produce high-quality images of hard X-rays produced by bremsstrahlung radiation from electrons accelerated during a solar flare. The only practical way to do this within the technological and budgetary limitations of the RHESSI era was to opt for indirect modalities in which imaging information is encoded as a set of two-dimensional spatial Fourier components. Radio astronomers had employed Fourier imaging for many years. However, differently than for radio astronomy, X-ray images produced by RHESSI had to be constructed from a very limited number of sparsely distributed and very noisy Fourier components. Further, Fourier imaging is hardly intuitive, and extensive validation of the methods was necessary to ensure that they produced images with sufficient accuracy and fidelity for scientific applications. This book summarizes the results of this development of imaging techniques specifically designed for this form of data. It covers a set of published works that span over two decades, during which various imaging methods were introduced, validated, and applied to observations. Also considering that a new Fourier-based telescope, STIX, is now entering its nominal phase on-board the ESA Solar Orbiter, it became more and more apparent to the authors that it would be a good idea to put together a compendium of these imaging methods and their applications. Hence the book you are now reading.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1978-06
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978-06 with Science categories.
Literature 1976 Part 2
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Author : S. Böhme
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-18
Literature 1976 Part 2 written by S. Böhme and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-18 with Science categories.
Astronomy and Astrophysics Abstracts, which has appeared in semi-annual volumes since 1969, is de voted to the recording, summarizing and indexing of astronomical publications throughout the world. It is prepared under the auspices of the International Astronomical Union (according to a resolution adopted at the 14th General Assembly in 1970). Astronomy and Astrophysics Abstracts aims to present a comprehensive documentation of literature in all fields of astronomy and astrophysics. Every effort will be made to ensure that the average time interval between the date of receipt of the original literature and publication of the abstracts will not exceed eight months. This time interval is near to that achieved by monthly abstracting journals, com pared to which our system of accumulating abstracts for about six months offers the advantage of greater convenience for the user. Volume 18 contains literature published in 1976 and received before March 1, 1977; some older liter ature which was received late and which is not recorded in earlier volumes is also included.