Tipo da ReferênciaJournal Article
Código do Detentorisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Chave de CitaçãoMendonça:1962:IoElCo
AutorMendonça, Fernando de
Identificador de Curriculo8JMKD3MGP3W34M/3KLSB52
AfiliaçãoComissão Nacional de Atividades Espaciais
TítuloIonospheric electron content and variations measured by doppler shifts in satellite transmissions
RevistaJournal of Geophysical Research
ResumoA method is derived for calculating ionospheric electron content by comparison of the Doppler shifts imparted to two harmonically related frequencies transmitted from a satellite. This Doppler method is applied in the analysis of many passages of the satellite Transit 2-A (1960η1) during the months of July through October 1960. The observations were made at Stanford, California, on the frequencies of 54 Mc/s and its sixth harmonic. Differences in the electron content of 25 per cent between two subionospheric points separated by as little as 1000 km were observed on several passages during magnetically quiet days. On some magnetically disturbed days these differences increased to over 50 per cent for the same separation. A very strong magnetic storm is shown to decrease the early-afternoon electron content to almost a normal nighttime value over the range of latitudes surveyed. Other less intense storms are observed to decrease the electron content to the north and to increase it to the south of the observer. The day-to-day variations of electron content at a given latitude on magnetically quiet days are observed to be about ±15 per cent from the mean; however, less frequently, variations as large as ±50 per cent were observed. Unlike the variations on the magnetically disturbed days, these variations did not seem to modify the horizontal gradients normally found.
Notasgoogle Acadêmico: 68
Web of Scince: 11
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Última Atualização2019: sid.inpe.br/mtc-m21b/2013/ marciana@sid.inpe.br
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2016-02-17 01:52:51 :: administrator -> marciana@sid.inpe.br :: 1962
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2019-01-18 04:57:01 :: administrator -> marciana@sid.inpe.br :: 1962
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Data de Acesso14 ago. 2020