Determinação da opacidade atmosférica em comprimentos de ondas submilimétricas
Tipo
Dissertação
Data
2017-07-28
Autores
Espinoza, Deysi Veronica Cornejo
Orientador
Raulin, Jean Pierre
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Castro, Carlos Guillermo Giménez de
Mendonça, Rafael Rodrigues Souza de
Mendonça, Rafael Rodrigues Souza de
Programa
Ciências e Aplicações Geoespaciais
Resumo
To understand the nature of the solar explosive radiation mechanisms at
high frequency radio waves, which depends on the interpretation of the flux density
spectrum (S), it is necessary to have a good estimate of the accuracy of S . For this
reason, the atmospheric opacity determination is essential, to correct the observed
solar radiation flux from radio telescopes in the ground. For high frequencies (e.g. in
the sub-millimeter and infrared wavelength), the water vapor is mainly responsible
of the atmospheric opacity. Thus, the solar radiation collected by the radio telescope
can be strongly attenuated up to a factor of 1000 (e.g. at 405 GHz). Therefore, it
is necessary to have a reliable estimate of the atmospheric opacity. The main aim
of this work is to determine the atmospheric opacity at 212 and 405 GHz using the
solar brightness method. Comparing with the characteristics of other methods in
the literature, we find that this one allows to determine the atmospheric opacity
up to considerably high values, and only depends on one parameter. Namely, the
product 𝑃 = 𝜂𝑇, where 𝑇 is the brightness temperature of the Sun measured at 212
and 405 GHz and 𝜂 is the beam efficiency; we assume that the 𝑃 value is constant
even though 𝑇 and 𝜂 are not well known individually. For the development of the
present work, we were used approximately 18 thousand solar scans recorded by the
Submillimetric Solar Telescope (SST, CASLEO, 2552 m altitude), for the period
between 2002 and 2015, where only clear days with low opacity were considered.
Using the solar brightness method, the 𝑃 value was calculated at 212 and 405
GHz. For the four beam at 212 GHz, we obtained: ¯ 𝑃 = 2446 ± 149 K (beam 1);
¯ 𝑃 = 2489±184 K (beam 2); ¯ 𝑃 = 2541±223 K (beam 3); ¯ 𝑃 = 2361±199 K (beam
4) and for the two beams at 405 GHz we obtained: ¯ 𝑃 = 3241±331 K (beam 5) and
¯ 𝑃 = 3299 ± 276 K (beam 6). Using the mean values ¯ 𝑃, the atmospheric opacities
𝜏212 and 𝜏405 were determined at 212 and 405 GHz, respectively. The correlation
between the opacities 𝜏212 and 𝜏405, show that the opacity at 405 GHz ∼ 7 times
more than that at 212 GHz. In addition, we also find that the atmospheric opacities
determined with the method proposed in this work show an excellent correlation
with the water vapor content, when this is measured simultaneously.
Descrição
Palavras-chave
opacidade atmosférica , transmissão atmosférica em ondas de submilimétricas , métodos para determinar a opacidade , vapor de água precipitável
Citação
ESPINOZA, Deysi Veronica Cornejo. Determinação da opacidade atmosférica em comprimentos de ondas submilimétricas. 2017. 69 f. Dissertação( Ciências e Aplicações Geoespaciais) - Universidade Presbiteriana Mackenzie, São Paulo.