Observation And Forecasting Of Solar Proton Events
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Observation And Forecasting Of Solar Proton Events
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Author : John P. Castelli
language : en
Publisher:
Release Date : 1968
Observation And Forecasting Of Solar Proton Events written by John P. Castelli and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Magnetic storms categories.
Solar burst characteristics in the radio microwave region are used to differentiate between large flares that might produce proton events and those that might not. Proton events produce high-level absorption, disrupt polar communications, and can be dangerous to man and equipment in space. They may precede the auroral and magnetic storms that disturb many radiowave propagation systems. The probability of a proton event can now be predicted, an AFCRL study of the characteristics of flare-associated centimeter radar bursts having established that a signature of proton events is a high flux density in the 3-cm region and a particular burst peak flux spectral configuration. (Author).
Observation And Forecasting Of Solar Proton Events
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Author : John P. Castelli
language : en
Publisher:
Release Date : 1968
Observation And Forecasting Of Solar Proton Events written by John P. Castelli and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Magnetic storms categories.
Solar burst characteristics in the radio microwave region are used to differentiate between large flares that might produce proton events and those that might not. Proton events produce high-level absorption, disrupt polar communications, and can be dangerous to man and equipment in space. They may precede the auroral and magnetic storms that disturb many radiowave propagation systems. The probability of a proton event can now be predicted, an AFCRL study of the characteristics of flare-associated centimeter radar bursts having established that a signature of proton events is a high flux density in the 3-cm region and a particular burst peak flux spectral configuration. (Author).
Two Papers On The Methods Of Evaluating The Quality Of Solar Proton Event Forecasts From The People S Republic Of China
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Author : Zhen-Xing Cui
language : en
Publisher:
Release Date : 1979
Two Papers On The Methods Of Evaluating The Quality Of Solar Proton Event Forecasts From The People S Republic Of China written by Zhen-Xing Cui and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Protons categories.
Forecasting Peak Proton Flux And Pca Event Magnitudes Using Flash Phase Integrated Radio Burst Flux Density
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Author : David T. Newell
language : en
Publisher:
Release Date : 1972
Forecasting Peak Proton Flux And Pca Event Magnitudes Using Flash Phase Integrated Radio Burst Flux Density written by David T. Newell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Correlation (Statistics) categories.
A new parameter is introduced for use in forecasting the magnitudes of solar proton and polar cap absorption events. Semi-integrated flux density is the integrated radio flux density under the start-to-maximum burst curve. An approximation to this function was correlated at five operational frequencies against both observed peak proton flux and observed riometer absorption, obtaining correlation coefficients > or = 0.88 at frequencies between 2695- and 8800-MHz. An operational real-time forecast scheme is detailed for the solar forecaster. Results from this study, which uses peak proton fluxes both corrected and uncorrected for solar disk positions, indicate that forecasts have a higher degree of correlation with observations if propagation corrections are not applied as present methods dictate. When used in conjunction with the Castelli 'U' burst spectrum criteria for forecasting the occurrence of proton events, radio data can be used exclusively for both a yes/no and an event magnitude forecast. A comparison with the method presently in use at the Air Weather Service's Aerospace Environmental Support Center, Solar Forecast Branch is made with very favorable results. (Author)
The Prediction Of Solar Proton Events Based On Solar Radio Emissions
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Author : William E. O'Brien
language : en
Publisher:
Release Date : 1970
The Prediction Of Solar Proton Events Based On Solar Radio Emissions written by William E. O'Brien and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Protons categories.
The short-term prediction of solar proton events based on a distinct U-shaped radio burst signature is verified. The prediction techniques uses peak flux density values of discrete frequency solar radio burst observations in the 100 to 10,000 MHz region. The criteria are applied to all major proton events from 1952 to 1969 and afford almost total success in predicting near-earth particle events that eminated from visible hemisphere regions of the sun. A correlation between U-shaped radio burst signatures and solar proton events as detected by the ATS-1 satellite, during 1967 and 1968, is also shown to be highly successful. Finally, a 'modified' U-shaped criterion is set forth for the accurate short-terms prediction of polar cap absorption events that result in at least a 2.0 dB riometer measurement of absorption. This 'modified' spectral configuration is then correlated with the major absorption events of the current solar cycle and it is found that prediction occurred for all principal PCA events that originated from visible solar hemisphere flares. (Author).
Forecasting Peak Proton Flux And Pca Event Magnitudes Using Flash Phase Integrated Radio Burst Flux Density
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Author : David T. Newell
language : en
Publisher:
Release Date : 1972
Forecasting Peak Proton Flux And Pca Event Magnitudes Using Flash Phase Integrated Radio Burst Flux Density written by David T. Newell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Correlation (Statistics) categories.
A new parameter is introduced for use in forecasting the magnitudes of solar proton and polar cap absorption events. Semi-integrated flux density is the integrated radio flux density under the start-to-maximum burst curve. An approximation to this function was correlated at five operational frequencies against both observed peak proton flux and observed riometer absorption, obtaining correlation coefficients> or = 0.88 at frequencies between 2695- and 8800-MHz. An operational real-time forecast scheme is detailed for the solar forecaster. Results from this study, which uses peak proton fluxes both corrected and uncorrected for solar disk positions, indicate that forecasts have a higher degree of correlation with observations if propagation corrections are not applied as present methods dictate. When used in conjunction with the Castelli 'U' burst spectrum criteria for forecasting the occurrence of proton events, radio data can be used exclusively for both a yes/no and an event magnitude forecast. A comparison with the method presently in use at the Air Weather Service's Aerospace Environmental Support Center, Solar Forecast Branch is made with very favorable results. (Author)
Prediction Of Solar Terrestrial Disturbances Decay Phase Of Energetic Proton Events
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Author : Edmond C. Roelof
language : en
Publisher:
Release Date : 1982
Prediction Of Solar Terrestrial Disturbances Decay Phase Of Energetic Proton Events written by Edmond C. Roelof and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
The decay phase of solar proton events, as observed at Earth, depends strongly on the proton injection history, the distribution of the proton population in solar longitude, and the state of the interplanetary medium. In an attempt to gain an additional diagnostic of these complex conditions, the evolution of the flux anisotropy is examined, both theoretically and observationally. In relatively simple events, the component of the flux anisotorpy parallel to the interplanetary magnetic field proves to be a useful indicator. In more complicated events additional information from solar wind, magnetic field, and lower energy (
Solar Particle Radiation Storms Forecasting And Analysis
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Author : Olga E. Malandraki
language : en
Publisher: Springer
Release Date : 2018-02-01
Solar Particle Radiation Storms Forecasting And Analysis written by Olga E. Malandraki and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-01 with Science categories.
Solar energetic particles (SEPs) emitted from the Sun are a major space weather hazard motivating the development of predictive capabilities. This book presents the results and findings of the HESPERIA (High Energy Solar Particle Events forecasting and Analysis) project of the EU HORIZON 2020 programme. It discusses the forecasting operational tools developed within the project, and presents progress to SEP research contributed by HESPERIA both from the observational as well as the SEP modelling perspective. Using multi-frequency observational data and simulations HESPERIA investigated the chain of processes from particle acceleration in the corona, particle transport in the magnetically complex corona and interplanetary space, to the detection near 1 AU. The book also elaborates on the unique software that has been constructed for inverting observations of relativistic SEPs to physical parameters that can be compared with space-borne measurements at lower energies. Introductory and pedagogical material included in the book make it accessible to students at graduate level and will be useful as background material for Space Physics and Space Weather courses with emphasis on Solar Energetic Particle Event Forecasting and Analysis. This book is published with open access under a CC BY license.
A Catalog Of Proton Events 1966 1976 Having Non Classical Solar Radio Burst Spectra
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Author : John P. Castelli
language : en
Publisher:
Release Date : 1978
A Catalog Of Proton Events 1966 1976 Having Non Classical Solar Radio Burst Spectra written by John P. Castelli and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Protons categories.
A catalog of about 118 proton events, 1966-1976, not included in an earlier catalog of 81 events (AFGL TR-77-0081) for the same period is presented. These 118 events combined with the earlier 81 provide the basis for summarizing solar radio burst/high-energy proton correlation and prediction signature work. In the earlier effort, hereafter called Catalog I, the starting point was the identification of all solar radio bursts having the classical U-shape spectrum, and then establishing proton event association for the purpose of devising a reliable 'false-alarm' free predictor of the major proton events (equivalent PCA 2-2. 5dB). In the present effort, the starting point is the identification of all other proton events not included in Catalog I (misses by the U-shape spectrum criteria), and then searching for the establishing solar radio correlations and possible predictions of weaker proton events. There are very few real misses of principal proton events.
The Prediction Of Solar Proton Events Based On Solar Radio Emissions
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Author : William E. O'Brien
language : en
Publisher:
Release Date : 1970
The Prediction Of Solar Proton Events Based On Solar Radio Emissions written by William E. O'Brien and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Protons categories.
The short-term prediction of solar proton events based on a distinct U-shaped radio burst signature is verified. The prediction technique uses peak flux density values of discrete frequency solar radio burst observations in the 100 to 10,000 MHz region. The criteria are applied to all major proton events from 1952 to 1969 and afford almost total success in predicting near-earth particle events that emanated from visible hemisphere regions of the sun. A correlation between U-shaped radio burst signatures and solar proton events as detected by the ATS-1 satellite, during 1967 and 1968, is also shown to be highly successful. Finally, a 'modified' U-shaped criterion is set forth for the accurate short-term prediction of polar cap absorption events that result in at least a 2.0 dB riometer measurement of absorption. This 'modified' spectral configuration is then correlated with the major absorption events of the current solar cycle and it is found that prediction occurred for all principal PCA events that originated from visible solar hemisphere flares. (Author).