Download or read book Thule Riometer Observations of Polar Cap Absorption Events 1962 1972 written by Raymond J. Cormier and published by . This book was released on 1973 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polar Cap Absorption (PCA) events have been observed at Thule, Greenland, using a ground-based riometer for the past decade. The riometer was operated at a fixed frequency of 30 MHz, and used a two-element Yagi antenna directed toward the zenith. This report provides information for operational systems personnel and systems designers concerning the mean behavior of PCAs and other aspects of the phenomenon; for example, the extreme cases in duration and magnitude. In addition, included as an appendix are plots of dB absorption and proton flux (obtained from satellites) versus time for each event. The total number of events is 29. (Author).
Download or read book The Calculation of Riometer Absorption and an Approximate Connection Between Riometer Absorption and Solar Proton Fluxes During Nighttime PCA Events written by Michael A. Stroscio and published by . This book was released on 1975 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report, the calculation of riometer absorption during several PCA events of particular interest is presented. These calculations are based on earlier work in which an improved effective recombination coefficient was derived and an atmospheric model for (1) each month of the year, (2) day and night, and (3) 60 deg N and 90 deg N latitude was presented. In this report, the calculated values of riometer absorption are presented for 5 PCA events: 2 Nov. 69, 7 Mar. 70, 25 Jan. 71, 2 Sep. 71, and 3 Aug. 72. The calculated values of riometer absorption are compared with experimental values measured for both day and night conditions at Thule, Greenland. An approximate connection between riometer absorption and the square-root of the proton flux for nighttime conditions is presented. This relationship, which has previously been applied only for daytime conditions, is discussed both on a fundamental level and on the level of verification by comparison with experiment. In addition, the basic equation widely used to calculate riometer absorption is compared with the original Sen-Wyller result.
Download or read book A Catalog of Proton Events 1966 1976 Having Non classical Solar Radio Burst Spectra written by John P. Castelli and published by . This book was released on 1978 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: A catalog of about 118 proton events, 1966-1976, not included in an earlier catalog of 81 events (AFGL TR-77-0081) for the same period is presented. These 118 events combined with the earlier 81 provide the basis for summarizing solar radio burst/high-energy proton correlation and prediction signature work. In the earlier effort, hereafter called Catalog I, the starting point was the identification of all solar radio bursts having the classical U-shape spectrum, and then establishing proton event association for the purpose of devising a reliable 'false-alarm' free predictor of the major proton events (equivalent PCA 2-2. 5dB). In the present effort, the starting point is the identification of all other proton events not included in Catalog I (misses by the U-shape spectrum criteria), and then searching for the establishing solar radio correlations and possible predictions of weaker proton events. There are very few real misses of principal proton events.
Download or read book Geophysics and Space Data Bulletin written by and published by . This book was released on 1973 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1973 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Report on Research at AFCRL written by Air Force Cambridge Research Laboratories (U.S.) and published by . This book was released on 1972 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Reports Air Force Geophysics Laboratory written by and published by . This book was released on 1973 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1976- include Its Geophysics and space data bulletin.
Download or read book Handbook of Geophysics and Space Environments written by U.S. Air Force Geophysics Laboratory and published by . This book was released on 1985 with total page 1066 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force Surveys in Geophysics written by and published by . This book was released on 1972 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography with Abstracts of AFCRL Publications from 1 April to 30 June 1973 written by Air Force Cambridge Research Laboratories (U.S.) and published by . This book was released on 1973 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of COSPAR Symposium on Solar Particle Event of November 1969 written by James C. Ulwick and published by . This book was released on 1972 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt: A COSPAR-sponsored Symposium on Solar Particle Events was held at Boston College at Chestnut Hill, Massachusetts on 16, 17, and 18 June 1971. The purpose of the symposium was to present measurements and observations made during the November 1969 Solar Proton Event. This particular event was unique in that extensive solar, magnetospheric and aeronomic measurements by rocket, satellite and ground based techniques were made to provide a comprehensive picture of the phenomenology and morphology of this event. In addition, present knowledge of solar proton events and their effects on the polar ionosphere was reviewed and discussed. This included theoretical studies as well as results from investigations of other solar proton events. The symposium comprised invited as well as contributed papers. A total of 49 papers presented at the symposium are included in these proceedings.
Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1974 with total page 1412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Research Papers written by and published by . This book was released on 1975 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Index written by and published by . This book was released on 1973 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Almost necessary Conditions for a Solar Active Region to Produce a Subsequent Polar Cap Absorption Event written by Edward W. Cliver and published by . This book was released on 1980 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Between 1955 and 1976, 133 polar cap absorption (PCA) events with unambigious solar flare associations were observed. Over one-fourth of these events (35/133) originated in solar active regions that had already produced a PCA. More significantly, these 'subsequent' PCA's included 35 percent (26/74) of all the principal greater than or = 2.0 dB) PCA's in this sample. In this paper, we establish quantitative criteria to distinguish between those solar active regions that are likely to produce such subsequent absorption events and those that pose no further threat to high latitude HF or VLF communications. These criteria are based on flare solar disk position and the greater than or = 8800 MHz burst peak flux density.
Download or read book Communications on the Move written by and published by IEEE Computer Society Press. This book was released on 1993 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Catalog of Proton Events 1966 1976 Having Non classical Solar Radio Burst Spectra written by John P. Castelli and published by . This book was released on 1978 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
