THz solar observations on board of a trans-Antarctic stratospheric balloon flight

BORTOLUCCI, E. C.; KROPOTOV, G.; MACHADO, NELSON; ABRANTES, A.; FERNANDES, L. O. T.; LAURENT, G.; MARUN, ADOLFO H.; KAUFMANN, P.; CASPI, A; KUDAKA, A; MARCON, R.

Copenhague

Conferencia; Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2016 41st International Conference; 2016

IEEE

Sub-THz and 30 THz solar burst observations revealed a new spectral component, with fluxes increasing towards THz frequencies, simultaneously with the well known component peaking at microwaves, bringing challenging constraints for interpretation [1]?[2][3]. The THz flare spectra can be completed with measurements made from space. A new system of two photometers was built to observe the Sun at 3 and 7 THz, named SOLAR-T [4]. An innovative optical setup allows observations of the full solar disk and detects small bursts with sub-second time resolution. The photometers use two Golay cell detectors at the foci of 76 mm Cassegrain telescopes. The incoming radiation undergoes low-pass filters made of rough surface primary mirrors and membranes, 3 and 7 THz band-pass filters, and choppers