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The Prediction Of Solar Proton Events Based On Solar Radio Emissions
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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 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:
Book Synopsis Observation and Forecasting of Solar Proton Events by : John P. Castelli
Download or read book Observation and Forecasting of Solar Proton Events written by John P. Castelli and published by . This book was released on 1968 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
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 by : Richard Frank Donnelly
Download or read book Solar-terrestrial Predictions Proceedings 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:
Book Synopsis Solar-terrestrial Predictions Proceedings: Prediction group reports by : Richard Frank Donnelly
Download or read book Solar-terrestrial Predictions Proceedings: Prediction group reports written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Peak-flux-density Spectra of Large Solar Radio Bursts and Proton Emission from Flares by : Edward W. Cliver
Download or read book Peak-flux-density Spectra of Large Solar Radio Bursts and Proton Emission from Flares written by Edward W. Cliver and published by . This book was released on 1985 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have reexamined the relationship between U-shaped peak-flux-density microwave spectra and solar proton events for approx 200 large (Sp(> or = 2GHz) > or = 800 solar flux uits (sfu) microwave burst (1965 - 1979). The radio spectra fell into two basic classes: (a) U-shaped with two maxima ( > or = 800 sfu) in the range from 200 MHz to > or = 10 GHz (59 percent of all events), and (b) cutoff spectra with a maximum > or = 800 sfu at f > or = 2 GHz and Sp (200 MHz) 100 sfu (18 percent). Nine percent of the events had intermediate spectra with a maximum or = 800 sfu at f > or = 2 GHz and 100 sfu or = Sp (200 MHz) 800 sfu. We were unable to classify 15 percent of the events because of incomplete data. The associations of the three classes of spectra with Type II (and/or Type IV) meter wavelenght bursts and 10 MeV proton events of any size ( or = 0.01 pr per sq cm per sec per sr) are as follows: U-shaped Type II/IV (90 percent of large microwave bursts with U-shaped spectra are associated with Type II/IV events), protons (77 percent); intermediate Type II/IV (78 percent), protons (73 percent); and cutoff Type II/IV (22 percent), protons (33 percent). These statistics affirm various lines of evidence linking coronal shock waves and interplanetary proton events. They also suggest that the meter wavelength branch of the U-shaped spectrum may be attributable to second phase (vs flash phase) accelerated electrons.
Book Synopsis Effect of the Ionosphere on Space and Terrestrial Systems by :
Download or read book Effect of the Ionosphere on Space and Terrestrial Systems written by and published by . This book was released on 1978 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Classification, Distribution, and Interpretion [sic] of Solar Microwave Burst Spectra and Related Topics by : John P. Castelli
Download or read book On the Classification, Distribution, and Interpretion [sic] of Solar Microwave Burst Spectra and Related Topics written by John P. Castelli and published by . This book was released on 1972 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report discusses the classification, distribution, and interpretation of the peak flux-density spectra of solar radio bursts in decimenter-centimeter range (1m to 1cm). It is based on observations at discrete frequencies between 245 and 35000 MHz taken at the Sagamore Hill Radio Observatory, Hamilton, Mass., through the years 1966-1969. The peak flux-density spectra of over 2000 radio bursts were used in this investigation. (Author).
Book Synopsis Discussions of Solar Proton Events and Manned Space Flight by : Kinsey Amor Anderson
Download or read book Discussions of Solar Proton Events and Manned Space Flight written by Kinsey Amor Anderson and published by . This book was released on 1961 with total page 22 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 1970 with total page 354 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 36 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 The Great Burst of May 23, 1967 by : John P. Castelli
Download or read book The Great Burst of May 23, 1967 written by John P. Castelli and published by . This book was released on 1967 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the largest radio bursts on record took place on May 23, 1967. Peak flux densities ranged between 23,000 flux units (10 to the minus 22nd power sq Wm/Hz) at 8800 MHz to about 370,000 units at 606 MHz. In addition to the high accuracy measurements of the peak flux densities at 606, 1415, 2695, 4995, and 8800 MHz, sweep frequency observations from 19 to 41 MHz show Type IV emission with Type II bursts occurring during the Type IV continuum. The associated flare was clearly visible in white light. In reviewing and compiling microwave radio data recorded during earlier white-light flares, it was found that all but one of eight events listed by Svestka (1966) had high microwave flux densities associated with them. In comparing radio burst intensity with optical flare importance for the series of three flares between 1809 and 2150 UT on May 23, 1967, there is only moderate agreement. The first radio burst was small; the second flare had the highest optical classification, while the third radio burst was by far the largest. The flux densities of the third radio burst may have been the highest ever recorded in the decimeter portion of the radio spectrum and among the largest four in the 8800 MHz region. It is suggested that the details of the development of the flare be followed on radio flux density plots to determine detailed correlation with particle events in space and with terrestrial effects. (Author).
Download or read book Energy Research Abstracts written by and published by . This book was released on 1982 with total page 1698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solar Activity in McMath Region 10789 During Disk Passage, 12 to 15 June 1970 by : Anne L. Carrigan
Download or read book Solar Activity in McMath Region 10789 During Disk Passage, 12 to 15 June 1970 written by Anne L. Carrigan and published by . This book was released on 1972 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Less than half a dozen longitude-identified active regions in the (current) 20th sunspot cycle produced 90 or more solar eruptions during disk passage. Besides a high flare-burst productivity, each of these was identified with energetic particle emission. A recent one of these regions was centered aroung longitude 226 degrees (17 degrees N latitude) in McMath region 10789, with central meridian passage on 16.8 June 1970. It is shown that the region which spawned an unusually high burst-to-flare ratio on 13 June had the maximum radio brightness at both 10.7 and 20 cm lambda in this brief interval. (Author Modified Abstract).
Book Synopsis Effects of Solar Disturbances on Radio Communications with Aircraft by : Joseph Horace Pope
Download or read book Effects of Solar Disturbances on Radio Communications with Aircraft written by Joseph Horace Pope and published by . This book was released on 1972 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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