Actas de congresos
Space And Ground-based New Tools For Thz Solar Flare Observations
Registro en:
26th International Symposium On Space Terahertz Technology, Isstt 2015. International Symposium On Space Terahertz Technology, p. , 2015.
2-s2.0-84947290406
Institución
Resumen
Recent sub-THz and 30 THz observations revealed an unexpected new spectral component, with fluxes increasing towards THz frequencies, simultaneously with the well known component peaking at microwaves, bringing challenging constraints for interpretation. The knowledge of the complete THz flare spectrum is the essential requirement for understanding the origin of this radiation. We present the concept, fabrication and performance of telescope photometric systems to observe solar flares at 3 and 7 THz from above the atmosphere, named SOLAR-T, and at 0.85 and 1.4 THz from the ground at a high altitude site, named HATS. The innovative optical setup allows observations of the full solar disk with high sensitivity to detect small burst transients (tens of solar flux units) with time resolution of less than one second. The SOLART space experiment uses two Golay cell detectors at the focus of 7.6 cm 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. The system has been integrated to data acquisition and telemetry modules for this application. Tests comprised the whole system performance, on ambient and low pressure and temperature conditions. SOLAR-T is being integrated to U.C. Berkeley gamma-ray GRIPS experiment to be flown on a long duration stratospheric balloon mission over Antarctica. The HATS telescope utilizes the same principles, with a 46 cm rough mirror Newtonian telescope, a Golay cell sensor preceded by low pass filter, and a double window chopper, each one with band pass filters at 0.87 and 1.4 THz. HATS now undergoes operational tests in Brazil, and is planned for operations in 2015 at a site to be selected in the Andes Cordillera, above 5000 m altitude.
Kaufmann, P., A new solar burst spectral component emitting only in the terahertz range (2004) Astrophys.J., 603, pp. L121-L124 Silva, A.V.R., Evidence that synchrotron emission from nonthermal electrons produces the increasing submillimeter spectral component in solar flares (2007) Solar Phys., 245, pp. 311-326 Kaufmann, P., Sub-terahetz, microwaves, and high energy emissions during the December 6, 2006 flare at 18:40 UT (2009) Solar Phys., 255, pp. 131-142 Kaufmann, P., A bright impulsive solar burst detected at 30 THz (2013) Astrophys. J., 768, p. 134. , (9pp) Fleishman, G.D., Kontar, E., Sub-THz radiation mechanisms in solar flares (2010) Astrophys. J, 709, pp. L127-L132 Krucker, S., Solar flares at submillimeter wavelength (2013) Astronon. Astrophys. Rev, 21 Deming, D., Kostiuk, T., Glenar, D., The solar infrared explorer (Sire): A small explorer mission for solar physics (1991) Baas, 23, 1038p Trottet, G., Klein, L., Molodij, G., Semery, A., Far infrered observations of solar flares during the next solar maximum (2006) 36th COSPAR Scientific Assembly, , 13-23 July, Beijing, China #1788 Suen, J., Fang, M., Lubin, P., Global distribution of water vapor and cloud cover-sites for high-performance THz applications (2014) IEEE Trans. THz Science and Technology, 4, pp. 86-100 Kaufmann, P., Solar-T : Terahertz photometers to observe solar flare emission on stratospheric balloon flights (2012) Proc. of Spie, 8442, pp. 8442L1-8442L9 Marcon, R., Terahertz photometer to observe solar flares in continuum (2012) J. Infrared, Millimeter and Terahertz Waves, 33, pp. 192-205 Kaufmann, P., THz photometers for solar flare observations from space (2014) Experimental Astronomy, 37, pp. 579-598 Golay, M.J.E., The theoretical and practical sensitivity of the pneumatic infra-red detector (1949) Rev. Sci. Instrum, 20, pp. 816-820 http://www.tydexoptics.com/pdf/Golay_cell.pdfKostiuk, T., Deming, D., A solar infrared photometer for space flight application (1991) Infrared Physics, 32, pp. 225-233 Kornberg, M.A., Rough mirrors for the THz frequency range (2008) Proc. Momag 2008 - 13th Sbmo and 8th Cbmag, pp. 365-367. , Florianopolis, SC, Brazil, 7-10 September http://www.tydexoptics.com/pdf/THz_Low_Pass_Filter.pdfMelo, A.M., Metal mesh resonant filters for terahertz frequencies (2008) Applied Optics, 47, pp. 6064-6069 Bortolocci, E.C., THz band-pass resonantmetal mesh filters for a space solar photometry experiment (2012) VII Workshop on Semiconductors and Micro & Nano Technology - Seminatec, 77p Marcon, R., Kaufmann, P., Método para maximizar ganho na detecção simultânea de radiaçãode fontes pequenas em campo extenso de visão (2011) Brazil Patent Application, Universidade Estadual de Campinas and Instituto Presbiteriano Mackenzie, , Patent filed March 30 Duncan, N., Detector and imaging systems for the gamma ray imager/polarimeter for solar flares (GRIPS) instrument (2013) Spie Proc, 8862. , 8862OW-1-8862OW-11 Matsushita, S., FTS measurements of sub-milliemeter atmospheric opacity at pampa la bola II: Supra-Terehertz windowsn and model fittings (1999) Pasp, 51, pp. 603-624 Kaveev, A.K., Kaveeva, E.G., Adaev, E.A., Pulse shape measurements using golay detector (2012) J.Infrared Milli Terahz Waves, 33, pp. 306-318 http://www.bisque.com/sc/pages/Paramount-ME.aspxhttp://www.sciencecenter.net/hutech/Hinode-sg/index.htm 26th International Symposium on Space Terahertz Technology, ISSTT 2015 16 March 2015 through 18 March 2015