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Author: Robert D. Sears
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Book Description
A study of the effects of the 12 November 1966 total solar eclipse upon the ionosphere has been conducted. The various sources of ionization in the D and E regions have been determined from measurements made during the eclipse period and from analytical models. In addition, the eclipse induced variations in the strength of the ionization source function with altitude during the eclipse has been modeled. Ionospheric measurements of positive ion species and total density, electron density, and O2(singlet Delta (g)) density and their variations during the eclipse were placed on a common eclipse-referenced coordinate system and these data were combined with a consistent data base for further studies. (Author).
Author: Robert D. Sears
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Book Description
A study of the effects of the 12 November 1966 total solar eclipse upon the ionosphere has been conducted. The various sources of ionization in the D and E regions have been determined from measurements made during the eclipse period and from analytical models. In addition, the eclipse induced variations in the strength of the ionization source function with altitude during the eclipse has been modeled. Ionospheric measurements of positive ion species and total density, electron density, and O2(singlet Delta (g)) density and their variations during the eclipse were placed on a common eclipse-referenced coordinate system and these data were combined with a consistent data base for further studies. (Author).
Author: Harold N. Ballard
Publisher:
ISBN:
Category :
Languages : en
Pages : 65
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Book Description
Late in 1965 the National Science Foundation (NSF) issued an invitation to United States scientists interested in the study of the 12 November 1966 solar eclipse to prepare experiment proposals so that NSF could provide effective coordination of the total eclipse study effort. The very important diurnal temperature variations associated with atmospheric tidal motions which were discovered in 1964 through use of sensitive synoptic rocket systems had raised questions relative to the response of the stratopause to perturbations of shorter period than the diurnal variations. A proposal was generated which provided a mechanism through which the necessary coordination was achieved and the experiment accomplished. Principal contributors to the experiment were the Atmospheric Sciences Laboratory, Comision Nacional de Investigaciones Espaciales (CNIE) of Argentina and the National Aeronautics and Space Administration. Personnel of CNIE moved the Chamical, Argentina, meteorological rocket station to Tartagal, Argentina to obtain observations in the path of the total eclipse. Data were obtained from each of the 12 rocket soundings under somewhat adverse field conditions. The data serves to point the way toward further experiments of this nature and was particularly informative in that it provided synoptic and diurnal data from a new location in the Southern Hemisphere for use in the global synoptic meteorological rocket network exploration of the upper atmosphere. (Author).
Author: Anton Ageevich Goryni︠a︡
Publisher:
ISBN:
Category : Astrometry
Languages : en
Pages : 76
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1252
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Author: Fred Espenak
Publisher:
ISBN: 9781941983362
Category :
Languages : en
Pages : 664
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Book Description
During the 5,000-year period from -1999 to +3000 (2000 BCE to 3000 CE), Earth will experience 11,898 eclipses of the Sun. The eclipses are distributed as follows: 4200 partial eclipses, 3956 annular eclipses, 3173 total eclipses, and 569 hybrid eclipses.The "Five Millennium Canon of Solar Eclipses: -1999 to +3000" contains an individual global map for each eclipse delineating the geographic regions of visibility for both the partial and central (total, annular, or hybrid) phases. Modern political borders are plotted to assist in the determination of eclipse visibility. The uncertainty in Earth's rotational period expressed in delta T and its impact on the geographic visibility of eclipses in the past and future is discussed.The statistics of the solar eclipse distribution over 5,000 years are discussed in detail. This includes eclipse types by month and by century, eclipse frequency in the calendar year, extremes in eclipse magnitude for all eclipse types, maximum durations of total, annular, and hybrid eclipses, and eclipse duos (two eclipses within 30 days of each other).Finally, the periodicity of solar eclipses is investigated with particular attention to the Saros cycle. Tables list the start and end dates, number, and type of eclipses of every Saros series in progress during the 5,000-year period covered by the Five Millennium Canon.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Julena Steinheider Duncombe
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ISBN:
Category : Solar eclipses
Languages : en
Pages : 21
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Author: Melvin G. Heaps
Publisher:
ISBN:
Category : D region
Languages : en
Pages : 54
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The 12 November 1966 solar eclipse has been modeled by a large multi-species chemistry code and the results compared with the numerous experimental measurements which were made at that time. Good agreement between measured preeclipse values of electron density and code-predicted values is obtained when ionization by precipitating electrons from the radiation belts is included. The current gas-phase ion chemistry does not predict the rapid decrease and subsequent reconstitution of the electron density about totality in the 65 to 85 km region, nor does it produce the large amounts of negative ions about 70 km which can be inferred from the experimental data. While basic constraints can be placed on the electron attachment processes because of the experimental data, an entirely new class of physical processes may possibly need to be included to explain this phase of D-region behavior. Comparison with experimental data provides a means of validating the basic atmospheric modeling computer codes which are used as input for Army communication systems and in the Army nuclear weapons effect community. (Author).
Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 1584
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Author: Pierre Kaufmann
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ISBN:
Category :
Languages : en
Pages : 19
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Radio observations of the Sun with a 4.28-cm radio polarimeter were performed during the 12 November 1966 total solar eclipse at a site located near the city of Bage, in the extreme south of Brazil. The solar activity during that period is discussed, giving additional data for the eclipse measurements themselves. (Author).
