Topic
Solar eclipse
About: Solar eclipse is a research topic. Over the lifetime, 2737 publications have been published within this topic receiving 22625 citations.
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TL;DR: In this article, 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.
6 citations
01 Jan 2003
TL;DR: In this article, the authors studied Albert Einstein's scientific career, with the purpose of trying to explain why he became such a universally famous and revered per- son, and various events of the past century are considered, and their effects on his scientific and personal reputation.
Abstract: Albert Einstein 's scientific career is studied, with the purpose of trying to explain why he became such a universally famous and revered per- son. Various events of the past century are considered, and their effects on his scientific and personal reputation. Some of the events studied are: the publication of the special and general theories of relativity, the 1919 solar eclipse and the famous meeting at which the results of the eclipse observations were announced, and Einstein 's visit to the United States in 1921. After his death, many biographies of Einstein were written, both before and after the availability of further information that became available about his personal life after the deaths of Helen Dukas and Otto Nathan; some of these are discussed, including the strange story of what happened to Einstein 's brain after his death. Celebrations of the centenary of his birth, the centenary of the theory of special relativity, and the centenary of the solar eclipse are also discussed. In spite of all the information that is available, the reasons for Einstein 's great and enduring fame remain mysterious.
6 citations
TL;DR: In this paper, the electron density changes in an ionospheric layer of the sun during an eclipse are represented by the relation: in which q is rate of production of electrons and α′ is effective recombination coefficient.
Abstract: DURING an eclipse of the sun, changes in the electron density (N) in an ionospheric layer of Chapman type may be represented by the relation: in which q is rate of production of electrons and α′ is effective recombination coefficient If the ionizing radiation were emitted uniformly from all parts of the disk, q would be proportional to the fraction (Ax) of the disk unobscured by the moon Observations made at optical frequencies show that the disk radiation is not uniformly distributed Consequently, if We assume that the ionizing radiation has a similar distribution, it is necessary to represent q during an eclipse by two terms denoting the intensity of the radiation coming from the uniform (AxI0) and non-uniform (Is) components respectively Thus: where K is a constant and χ is zenith angle of sun
6 citations
TL;DR: In this article, the authors investigated the impact of the 1999 solar eclipse on GPS positioning accuracy and found that there was no significant degradation of GPS positioning performance, and the results of statistical analysis showed no deterioration of GPS accuracy.
Abstract: Although GPS positioning errors are now well described, there are still some uncertainties regarding the impact of some rare space weather phenomena on GPS positioning accuracy. Solar eclipses have been considered as one source of such rare events, so the 1999 solar eclipse gave the opportunity to collect horizontal GPS positioning data for further analysis. The results of statistical analysis show no deterioration of horizontal GPS positioning accuracy. Space weather, ionospheric and geomagnetic conditions were also carefully analysed and showed no significant activity. In conclusion, the experiment confirmed negligible impact of the 1999 solar eclipse on horizontal GPS positioning accuracy, and opens discussion concerning application of satellite positioning systems in space and ionospheric weather monitoring.
6 citations