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Using Solar Radio Burst Integrated Fluxes To Predict Energetic Proton Flux Increases
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Book Synopsis Using Solar Radio Burst Integrated Fluxes to Predict Energetic Proton Flux Increases by : William R. Barron
Download or read book Using Solar Radio Burst Integrated Fluxes to Predict Energetic Proton Flux Increases written by William R. Barron and published by . This book was released on 1982 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-integrated solar ratio fluxes and their association with satellite observed solar energetic proton flux increases have been studied. The time-integration was only of the U-portion of the radio burst flux increase. The best correlations between the integrated radio fluxes and the proton peak fluxes were realized when the radio fluxes were multiplied by the factor exp (-3B), where B is the angular distance, in radians, between the site of the flare and the solar footpoint of the magnetic field connection between the sun and the earth. The solar footpoint positions were determined from the solar wind speed. Two-variate linear regressions were computed using the time-integrated radio fluxes at five discrete radio frequencies in the 606 to 8800 MHz frequency interval and peak proton fluxes at > 10 MeV and > 30 MeV. The higher frequencies of 2695, 4995 and 8800 MHz all correlated better with the > 10 -MeV protons than the lower frequencies. The > 30-MeV protons were even better correlated with the higher frequencies, but correlation with the lower frequencies were poorer. The Total Energy Density, E sub T, of the radio burst, an integration across the frequency interval of the time-integrated radio fluxes at each frequency, was found to be better correlated with the proton fluxes than any of the individual frequencies.
Book Synopsis Using Solar Radio Burst Integrated Fluxes to Predict Energetic Proton Flux Increases by : William R. Barron
Download or read book Using Solar Radio Burst Integrated Fluxes to Predict Energetic Proton Flux Increases written by William R. Barron and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-integrated solar ratio fluxes and their association with satellite observed solar energetic proton flux increases have been studied. The time-integration was only of the U-portion of the radio burst flux increase. The best correlations between the integrated radio fluxes and the proton peak fluxes were realized when the radio fluxes were multiplied by the factor exp ( -3B), where B is the angular distance, in radians, between the site of the flare and the solar footpoint of the magnetic field connection between the sun and the earth. The solar footpoint positions were determined from the solar wind speed. Two-variate linear regressions were computed using the time-integrated radio fluxes at five discrete radio frequencies in the 606 to 8800 MHz frequency interval and peak proton fluxes at> 10 MeV and> 30 MeV. The higher frequencies of 2695, 4995 and 8800 MHz all correlated better with the> 10 -MeV protons than the lower frequencies. The> 30-MeV protons were even better correlated with the higher frequencies, but correlation with the lower frequencies were poorer. The Total Energy Density, E sub T, of the radio burst, an integration across the frequency interval of the time-integrated radio fluxes at each frequency, was found to be better correlated with the proton fluxes than any of the individual frequencies.
Book Synopsis The Prediction of Solar Proton Events Based on Solar Radio Emissions by : William E. O'Brien
Download or read book The Prediction of Solar Proton Events Based on Solar Radio Emissions written by William E. O'Brien and published by . This book was released on 1970 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Prediction of the Proton Flux Magnitudes from Radio Burst Data by : Pradip Bakshi
Download or read book Prediction of the Proton Flux Magnitudes from Radio Burst Data written by Pradip Bakshi and published by . This book was released on 1978 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various radio-burst and proton spectral parameters are considered as correlation variables to develop an improved prediction scheme for the proton peak flux magnitudes. Besides the time integrated radio fluxes at individual frequencies, a frequency integration is also used over two different ranges. For the protons, besides the peak flux of protons (with energy greater than 10 MeV) their average energy and their duration are considered. A solar longitudinal correction is also applied. Our results lead to an improved prediction scheme and provide a better understanding of the correlation phenomena.
Book Synopsis The Role of the Big Flare Syndrome in Correlations of Solar Energetic Proton Fluxes and Associated Microwave Burst Parameters by : S. W. Kahler
Download or read book The Role of the Big Flare Syndrome in Correlations of Solar Energetic Proton Fluxes and Associated Microwave Burst Parameters written by S. W. Kahler and published by . This book was released on 1981 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: In previous studies correlating E> 10 MeV proton fluxes and spectra with various associated microwave burst parameters, the resulting high correlations were assumed to reflect a common acceleration process for the protons and the microwave-emitting electrons. We suggest and test an alternative explanation for these correlations, which we term the Big Flare Syndrome (BFS), that states that, statistically, energetic flare phenomena are more intense in larger flares, regardless of the detailed physics. Peak 1-8 A X-ray fluxes, characteristic of the thermal flare, are correlated with peak proton fluxes to derive correlation coefficients characteristics of the BFS. Of all microwave parameters tested for the 1973-1979 period, only the time-integrated flux densities at 8800 and 15400 MHz may be significantly larger than expected form the BFS. We fail to confirm previous results associating peak proton spectra with peak microwave spectral characteristics, thus finding no evidence that peak microwave fluxes are indicative of proton acceleration. We extend this conclusion to peak hard X-ray correlations. The strongly nonlinear relationship deduced between flare energy and proton production also appears invalid.
Book Synopsis A Catalog of Proton Events, 1966-1976, Having Non-classical Solar Radio Burst Spectra by : John P. Castelli
Download or read book A Catalog of Proton Events, 1966-1976, Having Non-classical Solar Radio Burst Spectra written by John P. Castelli and published by . This book was released on 1978 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Solar-terrestrial Predictions Proceedings: Solar activity predictions by : Richard Frank Donnelly
Download or read book Solar-terrestrial Predictions Proceedings: Solar activity predictions written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 1010 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Forecasting Peak Proton Flux and PCA Event Magnitudes Using 'flash-phase' Integrated Radio-burst Flux Density by : David T. Newell
Download or read book Forecasting Peak Proton Flux and PCA Event Magnitudes Using 'flash-phase' Integrated Radio-burst Flux Density written by David T. Newell and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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)
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1983 with total page 1368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solar-terrestrial Predictions Proceedings: Working group reports and reviews by : Richard Frank Donnelly
Download or read book Solar-terrestrial Predictions Proceedings: Working group reports and reviews written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Research Papers written by and published by . This book was released on 1981 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectral Correlations Between Solar Flare Radio Bursts and Associated Proton Fluxes, I. by : Pradip Bakshi
Download or read book Spectral Correlations Between Solar Flare Radio Bursts and Associated Proton Fluxes, I. written by Pradip Bakshi and published by . This book was released on 1974 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study is directed towards establishing a correlation between certain characteristics of the radio spectrum and the relative intensities of the proton spectrum as measured by peak proton fluxes. This study essentially provides a prediction on the hardness (shallow spectrum) or softness (steep spectrum) of the proton spectrum (peak proton flux vs. energy range).
Book Synopsis Solar activity reports by : Richard Frank Donnelly
Download or read book Solar activity reports written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1984 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
Book Synopsis Predicting Riometer Absorption for Solar Radio Bursts. I. Correlations Between Proton Spectra and Riometer Absorption by : Pradip Bakshi
Download or read book Predicting Riometer Absorption for Solar Radio Bursts. I. Correlations Between Proton Spectra and Riometer Absorption written by Pradip Bakshi and published by . This book was released on 1976 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observed riometer absorption A (in db) is correlated with the proton spectrum variable (log I (>10 MeV) + alpha log Rho), where I(>10 MeV) is the peak flux of protons with energies in excess of 10 MeV, Rho is a measure of the average energy of these protons and alpha is an adjustable parameter. Study of the major proton events (I(>10 MeV)> 100 protons / sq cm /sec/ ster since 1967 shows excellent correlations. Even when the average energy dependent factor is ignored (alpha=0), our approach provides better correlations than the usual square root relation; optimization over alpha further improves the correlations to r nearly equivalent to 0.97. A practical program for utilizing solar radio burst data for an early prediction of riometer absorption can now be developed by combining our previous studies on radio results from proton correlations with the proton results from riometer results reported here.
Book Synopsis Working group reports and reviews by : Richard Frank Donnelly
Download or read book Working group reports and reviews written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
