Estudo sobre a relação entre a atividade geomagnética e cintilações de sinais de GPS em Natal-RN (Brasil)
To identify the relationship between GPS scintillation in Natal-RN (Brazil) and geomagnetic disturbances of any intensities and variations, this work made analysis of the ionospheric behavior and magnetic indexes (Dst , AE and Bz of the interplanetary magnetic field) concerning to different perio...
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Formato: | Dissertação |
Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/20508 |
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Resumo: | To identify the relationship between GPS scintillation in Natal-RN (Brazil) and geomagnetic
disturbances of any intensities and variations, this work made analysis of the ionospheric behavior
and magnetic indexes (Dst , AE and Bz of the interplanetary magnetic field) concerning
to different periods of the solar cycle between 2000 and 2014. Part of the data of this research
originated at the UFRN observatory, from a GEC Plessey board connected to an ANP
-C 114 antenna, modified by Cornell University’s Space group Plasma Physics in order to operate
the ScintMon, a GPS monitoring program. This study, therefore, found several cases of
inhibited scintillations after the main phase of magnetic storms, a fact that, along with others,
corroborated with categorization of Aarons (1991) and models of disturbed dynamo (according
to Bonelli, 2008) and over-shielding penetration, defended by Kelley et al. (1979) and Abdu
(2011) [4]. In addition to these findings, different morphologies were noted in such disruptions
in the GPS signal in accordance with previous magnetic activities. It also found a moderate
relationship (R2 = 0.52) between the Dst rate (concerning to specific time) and the average of S4
through a polynomial function. This finding therefore, corroborating Ilma et al. (2012) [17], is
an important evidence that the scintillation GPS are not directly controlled by magnetic induction
of storms. Completing this work, this relation did show itself as a way of partial predicting
of scintillations. |
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