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Combining visibilities from the Giant Meterwave Radio Telescope and the Nançay Radio Heliograph: High dynamic range snapshot images of the solar corona at 327 MHz View all abstracts by submitter

Prasad Subramanian   Submitted: 2005-08-31 23:42

We report first results from an ongoing program of combining visibilities from the Giant Meterwave Radio Telescope (GMRT) and the Nançay Radio Heliograph (NRH) to produce composite snapshot images of the sun at meter wavelengths. We describe the data processing, including a specific multi-scale CLEAN algorithm. We present results of a) simulations for two models of the sun at 327 MHz, with differing complexity b) observations of a complex noise storm on the sun at 327 MHz on Aug 27 2002. Our results illustrate the capacity of this method to produce high dynamic range snapshot images when the solar corona has structures with scales ranging from the image resolution of 49'' to the size of the whole sun. We find that we cannot obtain reliable snapshot images for complex objects when the visibilities are sparsely sampled.

Authors: Claude Mercier (1), Prasad Subramanian (2), Alain Kerdraon (1), Monique Pick (1), S. Ananthakrishnan (3), P. Janardhan (4) ((1) Obs. Paris, Meudon, France, (2) IUCAA, Pune, India, (3) NCRA-TIFR, Pune, India, (4) PRL, Ahmedabad, India)
Projects: None

Publication Status: Accepted for publication in Astronomy & Astrophysics
Last Modified: 2005-08-31 23:42
Go to main E-Print page  Plasma Diagnostics of Active Region Evolution and Implications for Coronal Heating  Role of Sunspot and Sunspot-group Rotation in Driving Sigmoidal Active Region Eruptions  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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