Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0103k&link_type=abstract
American Astronomical Society, SPD meeting #42, #1.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The new solar burst emission spectral component showing sub-THz fluxes increasing with frequency, spectrally separated from the well known microwave component, brings serious constraints for interpretation. The knowledge of THz continuum spectral shape is essential to investigate the nature of the emission mechanisms involved. New 45 and 90 GHz solar polarimeters are being installed at El Leoncito high altitude observatory, where sub-THz (0.2 and 0.4 THz) solar flare flux data are being obtained regularly since several years. The development of THz photometers for continuum requires solutions for several technical challenges. To avoid atmospheric attenuation the THz solar observations should be carried in space or at selected frequency windows on exceptionally high sites near the South Pole. A double THz solar photometer system has been developed to operate at center frequencies of 3 and 7 THz. Golay cell sensors are used, preceded by a low pass membrane filter (f < 15 THz), resonant metal mesh band-pass filters with center frequencies at 3 and 7 THz (± 10% bandwidth), and a tuning fork resonant chopper. The incoming solar signal is collected by 75 mm diameter Cassegrain telescopes which reflectors’ surfaces are roughened in order to diffuse most of the visible and near IR thermal radiation. Brazil funding agency FAPESP has recently approved the construction of the dual THz frequency photometer system to be flown in a long duration stratospheric balloon flight in Antarctica (two weeks circumnavigation) in cooperation with University of California, Berkeley, together with GRIPS (Gamma-Ray Imaging Polarimeter for solar flares) experiment. One test flight is planned for 2012. USA. Another balloon flight over Russia (one week) is considered between 2014-2016, in a cooperation with Moscow Lebedev Physics Institute.
Correia Emilia
Giménez de Castro C.
Hurford Gordon
Kaufmann Patrik
Lin Robert P.
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