New telescopes for ground-based solar observations at sub-millimeter and mid-infrared

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 WallaceAzriel Yakubovich, Maria Beny Zakia

Research output: Chapter in Book/Report/Conference proceedingConference contribution

27 Scopus citations

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 roomtemperature 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 subsecond 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.

Original languageEnglish (US)
Title of host publicationGround-based and Airborne Telescopes II
DOIs
StatePublished - 2008
EventGround-based and Airborne Telescopes II - Marseille, France
Duration: Jun 23 2008Jun 28 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7012
ISSN (Print)0277-786X

Other

OtherGround-based and Airborne Telescopes II
CountryFrance
CityMarseille
Period6/23/086/28/08

Keywords

  • Mid-IR solar photometers
  • Solar flares
  • Submm-waves telescopes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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    Kaufmann, P., Levato, H., Cassiano, M. M., Correia, E., Costa, J. E. R., De Castro, C. G. G., Godoy, R., Kingsley, R. K., Kingsley, J. S., Kudaka, A. S., Marcon, R., Martin, R., Marun, A., Melo, A. M., Pereyra, P., Raulin, J. P., Rose, T., Valio, A. S., Walber, A., ... Zakia, M. B. (2008). New telescopes for ground-based solar observations at sub-millimeter and mid-infrared. In Ground-based and Airborne Telescopes II [70120L] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7012). https://doi.org/10.1117/12.788889