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Proceedings Paper

SOLAR-T: terahertz photometers to observe solar flare emission on stratospheric balloon flights
Author(s): P. Kaufmann; A. Abrantes; E. C. Bortolucci; E. Correia; J. A. Diniz; G. Fernandez; L. O. T. Fernandes; C. G. Giménez de Castro; R. Godoy; G. Hurford; A. S. Kudaka; M. Lebedev; R. P. Lin; N. Machado; V. S. Makhmutov; R. Marcon; A. Marun; V. A. Nicolaev; P. Pereyra; J.-P. Raulin; C. M. da Silva; A. Shih; Y. I. Stozhkov; J. W. Swart; A. V. Timofeevsky; A. Valio; T. Villela; M. B. Zakia
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Paper Abstract

A new solar flare spectral component has been found with intensities increasing for larger sub-THz frequencies, spectrally separated from the well known microwaves component, bringing challenging constraints for interpretation. Higher THz frequencies observations are needed to understand the nature of the mechanisms occurring in flares. A twofrequency THz photometer system was developed to observe outside the terrestrial atmosphere on stratospheric balloons or satellites, or at exceptionally transparent ground stations. 76 mm diameter telescopes were designed to observe the whole solar disk detecting small relative changes in input temperature caused by flares at localized positions at 3 and 7 THz. Golay cell detectors are preceded by low-pass filters to suppress visible and near IR radiation, band-pass filters, and choppers. It can detect temperature variations smaller than 1 K with time resolution of a fraction of a second, corresponding to small burst intensities. The telescopes are being assembled in a thermal controlled box to which a data conditioning and acquisition unit is coupled. While all observations are stored on board, a telemetry system will forward solar activity compact data to the ground station. The experiment is planned to fly on board of long-duration stratospheric balloon flights some time in 2013-2015. One will be coupled to the GRIPS gamma-ray experiment in cooperation with University of California, Berkeley, USA. One engineering flight will be flown in the USA, and a 2 weeks flight is planned over Antarctica in southern hemisphere summer. Another long duration stratospheric balloon flight over Russia (one week) is planned in cooperation with the Lebedev Physics Institute, Moscow, in northern hemisphere summer.

Paper Details

Date Published: 21 September 2012
PDF: 9 pages
Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84424L (21 September 2012); doi: 10.1117/12.926072
Show Author Affiliations
P. Kaufmann, Univ. Presbiteriana Mackenzie (Brazil)
Univ. Estadual de Campinas (Brazil)
A. Abrantes, Propertech Tecnologia Ltda. (Brazil)
E. C. Bortolucci, Univ. Estadual de Campinas (Brazil)
E. Correia, Univ. Presbiteriana Mackenzie (Brazil)
Instituto Nacional de Pesquisas Espaciais (Brazil)
J. A. Diniz, Univ. Estadual de Campinas (Brazil)
G. Fernandez, Complejo Astronómico El Leoncito (Argentina)
L. O. T. Fernandes, Univ. Presbiteriana Mackenzie (Brazil)
Univ. Estadual de Campinas (Brazil)
C. G. Giménez de Castro, Univ. Presbiteriana Mackenzie (Brazil)
R. Godoy, Complejo Astronómico El Leoncito (Argentina)
G. Hurford, Univ. of California, Berkeley (United States)
A. S. Kudaka, Univ. Presbiteriana Mackenzie (Brazil)
M. Lebedev, Special Astrophysical Observatory (Russian Federation)
R. P. Lin, Univ. of California, Berkeley (United States)
N. Machado, Propertech Tecnologia Ltda. (Brazil)
V. S. Makhmutov, P.N. Lebedev Physical Institute (Russian Federation)
R. Marcon, Univ. Estadual de Campinas (Brazil)
Observatório Solar Bernard Lyot (Brazil)
A. Marun, Complejo Astronómico El Leoncito (Argentina)
V. A. Nicolaev, Tydex (Russian Federation)
P. Pereyra, Complejo Astronómico El Leoncito (Argentina)
J.-P. Raulin, Univ. Presbiteriana Mackenzie (Brazil)
C. M. da Silva, Neuron Eletrônica Ltd. (Brazil)
A. Shih, NASA Goddard Space Flight Ctr. (United States)
Y. I. Stozhkov, P.N. Lebedev Physical Institute (Russian Federation)
J. W. Swart, Univ. Estadual de Campinas (Brazil)
A. V. Timofeevsky, Tydex (Russian Federation)
A. Valio, Univ. Presbiteriana Mackenzie (Brazil)
T. Villela, Instituto Nacional de Pesquisas Espaciais (Brazil)
M. B. Zakia, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 8442:
Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
Mark C. Clampin; Giovanni G. Fazio; Howard A. MacEwen; Jacobus M. Oschmann, Editor(s)

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