Studies of Solar Flare Effects and Other Ionospheric Disturbances with a High Frequency Doppler Technique PDF Download
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Author: Vaughan Agy
Publisher:
ISBN:
Category : Doppler effect
Languages : en
Pages : 160
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Book Description
This report presents some results of work done with a Doppler technique for studying ionospheric disturbances. The theoretical results include a calculation of the frequency shifts to be expected from ch * anges in the parameters of a parabolic model iono.
Author: Vaughan Agy
Publisher:
ISBN:
Category : Doppler effect
Languages : en
Pages : 160
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Book Description
This report presents some results of work done with a Doppler technique for studying ionospheric disturbances. The theoretical results include a calculation of the frequency shifts to be expected from ch * anges in the parameters of a parabolic model iono.
Author: D. M. Baker
Publisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 160
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Book Description
This report contains a review of the work done on frequency fluctuations of ionospheric radio echoes on high frequencies. The historical aspects are briefly discussed to show the development of research on solar flare effects and the motion of ionospheric irregularities. The recording program over the past 7 years and the equipment modifications involved are discussed. This is followed by a brief review of the elementary theory underlying frequency fluctuations. In most of the report the mathematical equations are listed in tables rather than distributed throughout the text. Solar flare effects (called sudden frequency deviations) are used to determine the relaxation time of the ionosphere.
Author:
Publisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 588
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Author: John Emory Jones
Publisher:
ISBN:
Category : Doppler radar
Languages : en
Pages : 476
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Book Description
This report describes a radio investigation of traveling ionospheric disturbances carried out near Boulder, Colorado, over a 1-year period from June 1967 to June 1968. The three-dimensional motions of F2 layer disturbances were measured by the high frequency Doppler technique with spaced transmitters and at several probing frequencies. Horizontal motions were determined by cross-correlating three signals on frequencies near 5 MHz, whose reflection points were approximately at the corners of a horizontal equilateral triangle with 40-km sides. Vertical motions were determined from cross-correlation of signals on frequencies of 3.3, 4.0, and 5.1 MHz, whose reflection points were aligned vertically.
Author: Richard Frank Donnelly
Publisher:
ISBN:
Category : Solar flares
Languages : en
Pages : 108
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Author: Richard Frank Donnelly
Publisher:
ISBN:
Category : Solar flares
Languages : en
Pages : 108
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Author: Richard Frank Donnelly
Publisher:
ISBN:
Category : Proton flares
Languages : en
Pages : 72
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Author: United States. National Oceanic and Atmospheric Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Author: Richard Frank Donnelly
Publisher:
ISBN:
Category : Atmospheric radiation
Languages : en
Pages : 52
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Book Description
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: United States. Environmental Science Services Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 54
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