Contribution Of X Ray And Extreme Ultraviolet Radiation Of Solar Flares To Sudden Frequency Deviations
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Author | : Richard Frank Donnelly |
Publisher | : |
Total Pages | : 52 |
Release | : 1969 |
Genre | : Atmospheric radiation |
ISBN | : |
Download Contribution of X-ray and Extreme Ultraviolet Radiation of Solar Flares to Sudden Frequency Deviations Book in PDF, Epub and Kindle
High time and intensity resolution satellite measurements of X-ray and extreme ultraviolet (EUV) radiation during solar flares are studied to determine the wavelength dependence of the flare radiation responsible for sudden frequency deviations (SFD). SFD's measure the flare-induced effects in the E and F1 regions of the ionosphere and are in effect like a broadband (1-1030 Å) detector for impulsive flare enhancements. He II 303.8 Å, O V 629.7 Å, H Ly [upsilon] 972.5 Å, C III 977.0 Å, and H Ly [alpha] 1215.7 Å were found to have essentially the same time dependence as the total ionizing radiation producing SFD's, except that they decay faster than the net 1-1030 Å radiation. Flare enhancements of Fe XV 284.1 Å, Fe XVI 335.3 Å, Si XII 499.3 Å. Mg X 625.3 Å, and Ne VIII 770.4 Å, which are normally coronal lines, appear to have a much slower time dependence than the radiation responsible for SFD's. X-rays in the 0.5-3 Å range are slightly slower than the radiation responsible for SFD's during the decay stage; 1-8 Å X-ray flares are slower, especially during the decay stages; and 8-20 Å flare radiation enhancements are slower throughout the entire SFD.
Author | : Richard Frank Donnelly |
Publisher | : |
Total Pages | : 39 |
Release | : 1969 |
Genre | : Atmospheric radiation |
ISBN | : |
Download Contribution of X-ray and Extreme Ultraviolet Radiation of Solar Flares to Sudden Frequency Deviations Book in PDF, Epub and Kindle
Author | : R. F. Donnelly |
Publisher | : |
Total Pages | : 35 |
Release | : 1968 |
Genre | : Atmospheric radiation |
ISBN | : |
Download Contribution of X-ray and Extreme Ultraviolet Radiation of Solar Flares to Sudden Frequency Deviations Book in PDF, Epub and Kindle
Author | : Richard Frank Donnelly |
Publisher | : |
Total Pages | : 108 |
Release | : 1970 |
Genre | : Solar flares |
ISBN | : |
Download Extreme Ultraviolet Flashes of Solar Flares Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 108 |
Release | : 1970 |
Genre | : |
ISBN | : |
Download Extreme Ultraviolet Flashes of Solar Flares Observed Via Sudden Frequency Deviations Book in PDF, Epub and Kindle
Author | : Richard Frank Donnelly |
Publisher | : |
Total Pages | : 56 |
Release | : 1968 |
Genre | : Solar flares |
ISBN | : |
Download Early Detection of a Solar Flare Book in PDF, Epub and Kindle
Solar X-ray, extreme ultraviolet, H[alpha] and radio emission were studies to determine what solar radiation is best suited for an automatic flare alarm system aboard a satellite for the detection of the start of a solar flare. Although hard X-rays ([lambda] “1 Å), centimeter-wavelength solar radio bursts, and flashes at certain EUV wavelengths usually have faster rise times and peak earlier than soft X-rays in the 2-16 Å range, the data available to date show that on the average the start time of the 2-16 Å X-rays occurs earlier than the start times for these other types of data. The early start times and large percentage increase of 2-16 Å X-rays make this radiation the best suited for the automatic detection of solar flares for the present state of the art of solar radiation measurements.
Author | : Richard Frank Donnelly |
Publisher | : |
Total Pages | : 112 |
Release | : 1974 |
Genre | : Solar flares |
ISBN | : |
Download An Atlas of Extreme Ultraviolet Flashes of Solar Flares Observed Via Sudden Frequency Deviations During the ATM-Skylab Missions Book in PDF, Epub and Kindle
Author | : D. W. Richards |
Publisher | : |
Total Pages | : 36 |
Release | : 1971 |
Genre | : Plasma oscillations |
ISBN | : |
Download Sudden Frequency Deviations, Solar Extreme Ultraviolet Bursts, and Solar Radio Bursts Book in PDF, Epub and Kindle
An investigation has been made of the interrelationship of solar extreme ultraviolet (EUV) bursts, solar radio bursts, and terrestrial ionospheric sudden frequency deviations (SFD's). No direct general relationships between radio spectra or burst intensities and SFD incidence or magnitude (Delta f) have been found. If the EUV enhancement is greater than 3 percent at Lambda 304 or Lambda 630 A, there is an 85 percent probability of occurrence of an SFD. Time of maxima of EUV and radio bursts are found to coincide extremely well. (Author).
Author | : United States. Superintendent of Documents |
Publisher | : |
Total Pages | : 1348 |
Release | : 1970 |
Genre | : United States |
ISBN | : |
Download Monthly Catalog of United States Government Publications, Cumulative Index Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : |
Release | : 1969 |
Genre | : Government publications |
ISBN | : |
Download Monthly Catalog of United States Government Publications Book in PDF, Epub and Kindle