Abstract Details
| Name: R. Ramesh Affiliation: Indian Institute of Astrophysics Conference ID: ASI2015_1033 Title : Observations of the solar corona at low radio frequencies Abstract Type : Invited Abstract : The Indian Institute of Astrophysics (IIA) is operating a low frequency (~120 - 30 MHz) radioheliograph at the Gauribidanur observatory, about 100 km north of Bangalore, for dedicated two-dimensional imaging observations of the solar corona since 1997. Presently the array (Gauribidanur RAdioheliograPH - GRAPH) is being upgraded in a phased manner to improve the spatial, temporal, spectral resolutions and sensitivity. In addition to the heliograph, IIA is also operating a radio spectrograph (Gauribidanur LOw frequency Solar Spectrograph, GLOSS) and a radio polarimeter (Gauribidanur Radio Interference Polarimeter, GRIP) - both in the same frequency range and dedicated for solar observations similar to the GRAPH (see http://www.iiap.res.in/centers/radio for details). Radio emission in the above frequency band corresponds typically to the heliocentric distance range of ~ 1.2 - 2.0 solar radii where observations in other regions of the spectrum are presently limited. Additionally, radio observation has the unique advantage of simultaneously observing the corona overlying the solar disk as well as off the solar limb. An overview of the scientific results (particularly related to the coronal mass ejections, coronal magnetic field, and the weak energy releases) that have been obtained so far with the above instruments and the scope of combining observations from Gauribidanur and those with the coronagraph and X-ray spectrometers on board ADITYA-1, our country's proposed first space solar mission, will be discussed. |