Download or read book Contribution of X ray and Extreme Ultraviolet Radiation of Solar Flares to Sudden Frequency Deviations written by Richard Frank Donnelly and published by . This book was released on 1969 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Contribution of X ray and Extreme Ultraviolet Radiation of Solar Flares to Sudden Frequency Deviations written by Richard Frank Donnelly and published by . This book was released on 1969 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contribution of X ray and Extreme Ultraviolet Radiation of Solar Flares to Sudden Frequency Deviations written by R. F. Donnelly and published by . This book was released on 1968 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extreme Ultraviolet Flashes of Solar Flares written by Richard Frank Donnelly and published by . This book was released on 1970 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extreme Ultraviolet Flashes of Solar Flares Observed Via Sudden Frequency Deviations written by and published by . This book was released on 1970 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early Detection of a Solar Flare written by Richard Frank Donnelly and published by . This book was released on 1968 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book An Atlas of Extreme Ultraviolet Flashes of Solar Flares Observed Via Sudden Frequency Deviations During the ATM Skylab Missions written by Richard Frank Donnelly and published by . This book was released on 1974 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sudden Frequency Deviations Solar Extreme Ultraviolet Bursts and Solar Radio Bursts written by D. W. Richards and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1970 with total page 1348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of Sudden Ionospheric Disturbances Associated with the Proton Flare of 1522 UT August 28 1966 written by Richard Frank Donnelly and published by . This book was released on 1968 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1969 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Publications of the ESSA Research Laboratories written by and published by . This book was released on 1966 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Review of Some Ionospheric Studies Based on a High frequency Doppler Technique written by and published by . This book was released on 1968 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 1256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of Sudden Frequency Deviations Due to the Immediate Ionospheric Effects of Solar Flares written by Richard Frank Donnelly and published by . This book was released on 1967 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The solar-flare radiation and ionospheric processes responsible for a type of ionospheric disturbances, called "sudden frequency deviations" (SFD), are investigated. Models of X-ray flare radiation are constructed from satellite X-ray observations, and corresponding SFD effects are calculated for representative ionospheric and radio-transmission parameters. SFD's and satellite observations are studied in detail for the following flare events: 19:35 U.T., April 19, 1962, the largest SFD observed at Boulder and the largest high-energy X-ray burst observed by OSO I; 20:00 U.T., April 20, 1962, one of the largest flare enhancements of HeII (304 Å) line emission observed by OSO I; and 22:40 U.T., October 22, 1963, observed by the VELA satellites. SFD's are associated with impulsive bursts of ionizing radiation with rise times of several minutes or less; radiation enhancements with longer rise times (tens of minutes) are ineffective in causing SFD's. Some SFD's can be explained by X-ray enhancements in the 4-100 Å Range, but most SFD's also require sizeable enhancements at wavelengths longer than 100 Å. Observed enhancements of HeII (304 Å) are large enough to be important to SFD's provided they are sufficiently impulsive (time resolution of present satellite observations of EUV radiation is inadequate for comparison with SFD's; no HeII (304 Å) observations have been made during an SFD observed at Boulder, Colorado). Lyman [alpha] enhancements and X-ray bursts at less than 0.5 Å do not contribute significantly to SFD's
Download or read book ESSA Technical Report ERL written by United States. Environmental Science Services Administration and published by . This book was released on 1968 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SDL written by and published by . This book was released on 1970 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
