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Proceedings Paper

New telescopes for ground-based solar observations at submillimeter and mid-infrared
Author(s): Pierre Kaufmann; Hugo Levato; Marta M. Cassiano; Emilia Correia; Joaquim E. R. Costa; C. Guillermo Giménez de Castro; Rodolfo Godoy; Robert K. Kingsley; Jeffrey S. Kingsley; Amauri S. Kudaka; Rogério Marcon; Robert Martin; Adolfo Marun; Arline M. Melo; Pablo Pereyra; Jean-Pierre Raulin; Thomas Rose; Adriana Silva Valio; Achim Walber; Patrick Wallace; Azriel Yakubovich; Maria Beny Zakia
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Paper Abstract

The solar submillimeter-wave telescope (SST) is the only one of its kind dedicated to solar continuous observations. Two radiometers at 0.740 mm (405 GHz), and four at 1.415 mm (212 GHz) are placed in the Cassegrain focal plane of the 1.5-m dish at El Leoncito high altitude site, San Juan, Argentina. The aperture efficiencies are close to design predictions: 20% and 35% for 2 and 4 arcminutes beam sizes at 405 and 212 GHz, respectively. The positioner absolute pointing accuracy is 10 arcseconds. Spectral coverage is complemented by ground-based mid-infrared telescopes developed for high cadence observations in the continuum 10 micron band (30 THz), using small apertures and room-temperature microbolometer cameras. Using the system, a new solar burst spectral component was discovered, exhibiting fluxes increasing for smaller wavelengths, separated from the well known microwave component. Rapid sub-second pulsations are common for all bursts. The pulsations onset times of appear to be connected to the launch times of CMEs. Active regions are brighter for shorter submillimeter-waves. Mid-IR bright regions are found closely associated with calcium plages and magnetic structures near the solar photosphere. Intense and rapid 10 micron brightening was detected on active centers in association with weak flares. These results raise challenging difficulties for interpretation.

Paper Details

Date Published: 10 July 2008
PDF: 8 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70120L (10 July 2008); doi: 10.1117/12.788889
Show Author Affiliations
Pierre Kaufmann, Univ. Presbiteriana Mackenzie (Brazil)
Univ. Estadual de Campinas (Brazil)
Hugo Levato, Complejo Astronômico El Leoncito (Argentina)
Marta M. Cassiano, Univ. Presbiteriana Mackenzie (Brazil)
Emilia Correia, Univ. Presbiteriana Mackenzie (Brazil)
Instituto Nacional de Pesquisas Espaciais (Brazil)
Joaquim E. R. Costa, Instituto Nacional de Pesquisas Espaciais (Brazil)
C. Guillermo Giménez de Castro, Univ. Presbiteriana Mackenzie (Brazil)
Rodolfo Godoy, Complejo Astronômico El Leoncito (Argentina)
Robert K. Kingsley, Univ. of Arizona, Steward Observatory (United States)
Jeffrey S. Kingsley, Univ. of Arizona, Steward Observatory (United States)
Amauri S. Kudaka, Univ. Presbiteriana Mackenzie (Brazil)
Rogério Marcon, Univ. Estadual de Campinas (Brazil)
Bernard Lyot Solar Observatory (Brazil)
Robert Martin, Composite Mirror Applications, Inc. (United States)
Adolfo Marun, Complejo Astronômico El Leoncito (Argentina)
Arline M. Melo, Univ. Presbiteriana Mackenzie (Brazil)
Univ. Estadual de Campinas (Brazil)
Pablo Pereyra, Complejo Astronômico El Leoncito (Argentina)
Jean-Pierre Raulin, Univ. Presbiteriana Mackenzie (Brazil)
Thomas Rose, RPG - Radiometer Physics (Germany)
Adriana Silva Valio, Univ. Presbiteriana Mackenzie (Brazil)
Achim Walber, RPG - Radiometer Physics (Germany)
Patrick Wallace, STFC Rutherford Appleton Lab. (United Kingdom)
Azriel Yakubovich, Orbit Technology Group, Ltd. (Israel)
Maria Beny Zakia, Univ. Estadual de Campinas (Brazil)


Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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