Arctic Ionosphere Modelling


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NBS Technical Note


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An Ionospheric Model for the Arctic


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A first order approximation model of the Arctic ionosphere is described, based on published observations and concepts. The model allows for modifications and additions whenever new information becomes available, and will eventually represent a true picture available in real time or even as forecast. The location of the phenomena is specified in corrected geomagnetic latitude and local time. Various input parameters are included whenever some of their influences are known, such as UT, seasons, sunspot number, magnetic variations. The Arctic ionospheric features are specified as 'quasi-instant' deviations from routine predictions whereby the devitations represent probabilities of occurrence during periods that may range from 20 min to 3 hr. The following ionospheric features are more or less covered: auroral E (or night-E), auroral Es (or Esr), HF absorption, Arctic F. Necessary improvements to the model are indicated, including the inclusion of storm-time of individual substorms and the requirement that routine observations be maintained in the midnight sector of the auroral oval. (Author).




Journal of Research


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Ionospheric and Tropospheric Limitations to Radar Accuracy


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The report discusses the contribution of the troposphere and the ionosphere and their irregularities to the residual errors of specific radar systems located in midlatitude and polar regions. (Author).




Annals of the International Geophysical Year


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Annals of the International Geophysical Year, Volume 48: Bibliography and Index contains bibliography of articles published in connection with the International Geophysical Year (IGY). The preparatory and operational phases of the IGY occupied nearly a decade and the data accumulated in the many scientific disciplines by workers in some 67 countries will provide material for publication for many years. The references have been assembled from information supplied by a wide variety of sources. These references have been grouped into 21 sections, of which Sections I-XIV followed the discipline grouping adopted during the IGY. Within each section references have been arranged in alphabetical order according to the name of the principal author. Anonymous articles are listed at the end of each section, again arranged in alphabetical order by title. In the scientific literature, author's names originally printed in Cyrillic symbols sometimes appear with several different spellings because of the use of different transliteration systems. In the present Bibliography an attempt has been made to achieve consistency by using the same transliteration system throughout. This book will prove useful to geophysicists and researchers who are interested in the accomplishments of the International Geophysical Year.




Technical Abstract Bulletin


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