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Goldstone Apple Valley Radio Telescope (GAVRT) is a science educationpartnership among NASA, the Jet Propulsion Laboratory (JPL), and the LewisCenter for Educational Research (LCER), offering unique opportunities for K -12students and their teachers. The GAVRT program operates a 34-m radio telescopewith a wide-band, low noise receiver, which is tunable in four independentdual-polarization bands from 3 to 14 GHz. The annular eclipse of the Sun on2012 May 20 was observed by GAVRT as part of education outreach. In this paperwe present the results of this eclipse data and discuss the multi-wavelengthstrip scan brightness distribution across three active regions. We derive thesource brightness temperatures and angular sizes as a function of frequency andinterpret the results in terms of the gyroresonance mechanism. We show examplesof the increasing brightness and widening of source size (isogauss surface)with wavelength as evidence for gyroresonance emission layers of broader(diverging ) isogauss surfaces of the magnetic field geometry in the coronaabove solar surface. We present an example how the derived frequency -brightness temperature relationship is translated to a magnetic field -brightness temperature relationship under the frame-work of gyroresonanceemission. Our results demonstrate the usefulness of GAVRT bands as excellentprobes to study the layers of the corona above the active regions (sun spots),in particular the prevalence of the gyroresonance mechanism. Our resultsprovide a frame-work for multiwavelength cm-wavelength eclipse observations andillustrate how the GAVRT program and K- 12 student/teacher participation canproduce science data useful to the scientific community and science missions.

publications of the astronomical society of the pacific

Goldstone Apple Valley Radio Telescope Observations of 2012 Solar  Eclipse: A Multi-wavelength study of cm-wavelength Gyroresonance Emission  from Active Regions