The Influence Of Radio Brightness Temperature On Solar Flare Prediction
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The Influence Of Radio Brightness Temperature On Solar Flare Prediction
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Author : Alfred E. Reilly
language : en
Publisher:
Release Date : 1967
The Influence Of Radio Brightness Temperature On Solar Flare Prediction written by Alfred E. Reilly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Blackbody radiation categories.
An objective technique based on two measured parameters has been developed to determine the probability of occurrence of a solar flare near a sunspot group. The parameters utilized were the size of each sunspot group and the magnitude of an associated radio brightness temperature. Flare, sunspot, and radio data measured daily during the period from April 1962 through October 1966 were used in the study. These data were associated objectively and analyzed statistically. The size of a sunspot group is a significant predictor in itself. This analysis shows that consideration of radio brightness temperature significantly improves the accuracy of solar flare prediction beyond the accuracy that can be achieved by considering only the size of the sunspot group. (Author).
The Influence Of Radio Brightness Temperature On Solar Flare Prediction
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Author : Alfred E. Reilly
language : en
Publisher:
Release Date : 1967
The Influence Of Radio Brightness Temperature On Solar Flare Prediction written by Alfred E. Reilly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Blackbody radiation categories.
An objective technique based on two measured parameters has been developed to determine the probability of occurrence of a solar flare near a sunspot group. The parameters utilized were the size of each sunspot group and the magnitude of an associated radio brightness temperature. Flare, sunspot, and radio data measured daily during the period from April 1962 through October 1966 were used in the study. These data were associated objectively and analyzed statistically. The size of a sunspot group is a significant predictor in itself. This analysis shows that consideration of radio brightness temperature significantly improves the accuracy of solar flare prediction beyond the accuracy that can be achieved by considering only the size of the sunspot group. (Author)
An Objective Baseline For Flare Prediction
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Author : Ronald T. Podsiadlo
language : en
Publisher:
Release Date : 1972
An Objective Baseline For Flare Prediction written by Ronald T. Podsiadlo 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.
The relationship between various measurable solar parameters and solar-flare occurrence is examined utilizing a comprehensive solar-geophysical data base containing a variety of objectively-correlated solar measurements. The sample covers the period from January 1955 through February 1968 and includes such parameters as solar flares, sunspots, magnetic fields of sunspots, calcium plages and 9.1 cm radio brightness temperatures. A statistical analysis was performed to determine the parameters most useful for the prediction of solar flares 24 hours in advance. Persistence was identified as the single most important flare predictor, with sunspot magnetic classification, 9.1 cm radio brightness temperature, plage brightness and sunspot area also selected as useful predictors. Objective flare probability prediction equations were developed that incorporate all useful predictors simultaneously. (Author).
An Objective Baseline For Flare Prediction
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Author : Ronald T. Podsiadlo
language : en
Publisher:
Release Date : 1972
An Objective Baseline For Flare Prediction written by Ronald T. Podsiadlo 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.
The relationship between various measurable solar parameters and solar-flare occurrence is examined utilizing a comprehensive solar-geophysical data base containing a variety of objectively-correlated solar measurements. The sample covers the period from January 1955 through February 1968 and includes such parameters as solar flares, sunspots, magnetic fields of sunspots, calcium plages and 9.1 cm radio brightness temperatures. A statistical analysis was performed to determine the parameters most useful for the prediction of solar flares 24 hours in advance. Persistence was identified as the single most important flare predictor, with sunspot magnetic classification, 9.1 cm radio brightness temperature, plage brightness and sunspot area also selected as useful predictors. Objective flare probability prediction equations were developed that incorporate all useful predictors simultaneously. (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)
Solar Flare Prediction
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Author : C. Sawyer
language : en
Publisher:
Release Date : 1986
Solar Flare Prediction written by C. Sawyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Science categories.
This study looked at observational and theoretical studies of flare physics, at quests for flare precursors, and at mathematical models for combining masses of predictive information. We also looked at the worldwide effort to gather and share timely data and combine it with knowledge and experience to forecast solar flares and their effects. Topics include: Long-lived, large-scale magnetic and velocity fields; Magnetic-energy buildup in an active region; Flare initiation; Flare precursors -- Filament activation, Preflare brightening, Magnetic shear, and Emerging and cancelling magnetic flux; Quantitative prediction; Operational solar flare prediction; Forecast evaluation.
Solar Flare Loops Observations And Interpretations
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Author : Guangli Huang
language : en
Publisher: Springer
Release Date : 2018-01-31
Solar Flare Loops Observations And Interpretations written by Guangli Huang and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-31 with Science categories.
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.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1991
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 1991 with Aeronautics categories.
A Compilation Of Solar Radio Sweep Frequency Observations 1955 1964
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Author : Hans J. E. Fischer
language : en
Publisher:
Release Date : 1968
A Compilation Of Solar Radio Sweep Frequency Observations 1955 1964 written by Hans J. E. Fischer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Extraterrestrial radiation categories.
The solar radio sweep-frequency observations and hours of patrol from five rad radio observatories for the period 1955 through 1964 have been compiled, edited, and put onto two magnetic tapes. One tape contains the hours of radio patrol from the observatories at Ann Arbor, Bigpine, Boulder, Sydney and Fort Davis. Another tape contains the sweep-frequency observations in the meter and dekameter wavelengths of the radio spectrum from these observatories. The sources, methods of reduction, and the format and content of the data on tape are described. Statistics related to various distributions of the radio spectral activity reported by each station are discussed and demonstrate an urgent need for standard policies in detecting, scaling, classifying, and reporting these data.
A Comparison Of Reported Solar Flare Occurrence Times And Flare Patrol Times 1955 1964
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Author : Ronald T. Podsiadlo
language : en
Publisher:
Release Date : 1967
A Comparison Of Reported Solar Flare Occurrence Times And Flare Patrol Times 1955 1964 written by Ronald T. Podsiadlo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Astronomical observatories categories.
A flare event list that is consistent with flare patrol times is prerequisite to a reliable, unbiased estimate of flare occurrence per unit patrol time. A comparison of the flare occurrence times and flare patrol times reported by 52 solar observatories during the period of 1955 to 1964 discloses that 12.3 percent of the flare reports (Importance = or > 1) have no reported patrol coverage. Elimination of these 'unpatrolled' flare reports reduces the number of individual flare events in the data sample by 9.7 percent. This means that flare occurrence per unit patrol time computed from the raw flare and flare patrol data is overestimated by this same percentage. In addition to eliminating 'unpatrolled' flare reports, appropriate adjustments are made in the 'patrolled' flare data so as to make each observatory's reported flare times completely consistent with its reported patrol times.