Solar Radio Astronomy

The Square Kilometre Array (SKA) will be the largest radio telescope ever built, aiming to provide collecting area larger than 1 km 2. The SKA will have two independent instruments, SKA-LOW comprising of dipoles organized as aperture arrays in Australia and SKA-MID comprising of dishes in South Africa. Currently the phase-1 of SKA, referred to as SKA1, is in its late design stage and construction is expected to start in 2020. Both SKA1-LOW (frequency range of 50-350 MHz) and SKA1-MID Bands 1, 2, and 5 (frequency ranges of 350-1050, 950-1760, and 4600-15300 MHz, respectively) are important for solar observations. In this paper we present SKA's unique capabilities in terms of spatial, spectral, and temporal resolution, as well as sensitivity and show that they have the potential to provide major new insights in solar physics topics of capital importance including (i) the structure and evolution of the solar corona, (ii) coronal heating, (iii) solar flare dynamics including particle acceleration and transport, (iv) the dynamics and structure of coronal mass ejections, and (v) the solar aspects of space weather. Observations of the Sun jointly with the new generation of ground-based and space-borne instruments promise unprecedented discoveries.

A vigorous solar flare event marked on the spectrometer of the CALLISTO data, being one of the highest solar flare event that successfully detected. The formation of solar burst type II in meter region and their associated with X6. 9-class solar flares have been reported. The burst has been observed at the Blein Obsevatory, Switzerland, which detected by the Compound Astronomical Lowcost Low-frequency Instrument for Spectroscopy and Transportable Observatory (CALLISTO) system in the range of 170-870 MHz in the two polarizations of left and right circular polarization. It occurred between 08:01 UT to 08:08 UT within 7 minutes. The Compound Astronomical Low-cost Lowfrequency Instrument for Spectroscopy and Transportable Observatory CALLISTO spectrometer is a solar dedicated spectrometer system that has been installed all over the world to monitor the Sun activity in 24 hours. The growth of this burst is often accompanied by abundance enhancement of particles which may take the form of...

New striking aspects of solar activity have been found from observations at frequencies above 100 GHz, provided by the solar submillimeter-wave telescope (SST) at El Leoncito in the Argentina Andes. The SST utilizes a radome-enclosed 1.5-m Cassegrain reflector, operating simultaneously with four 212 GHz and two 405 GHz total power radiometers with 5ms time resolution. Partial overlapping of antenna beams

The Solar Radio Astronomy Group within the Commonwealth Scientific and Industrial Research Organisation's Division of Radiophysics built the world's first radiospectrograph at Penrith (Australia) in 1948. The instrument was used to study radio emission from the active Sun over the continuous frequency range of 70 to 130 MHz. This led to the first spectral classification of solar radio bursts which advanced the scientific study of space research by the real time monitoring of the active corona.

Detection of the late time integrated Sachs-Wolfe effect (ISW) is an active area of study related to Large Scale Structures (LSS).The ISW effect can be studied by observing the non- zero cross-correlation between cosmic microwave background (CMB) anisotropies with tracers of mass field, such as galaxy survey data. We plan to study this effect by cross-correlating the CMB data and related cosmological parameters as delineated by the  Wilkinson microwave anisotropy probe(WMAP)with the upcoming  evolutionary map of the universe (EMU) survey planned for Australian square kilometer array Pathfinder(ASKAP).EMU-ASKAP is planned to conduct a deep radio continuum survey with rms10µJy/beam. The survey is planned to cover the entire southern sky, extending to North + 30degreedeclination.Toinferthe expected redshift distribution (dN/dz) and differential source count (S) of the survey that can be extracted from the EMU galaxies, we use data from S-cubed  simulation of extra galactic radio continuum(S3- SEX) for square kilometer array design studies (SKADS). We also calculate various parameters including galaxy survey shot noise, rms confusion uncertainty, and position uncertainty for the survey which can help in understanding the accuracy and analyzing the results of the data.  We also discuss Signal to noise ratios over range of maximum redshifts and maximum multipole values with some discussion on constraints over ΩΛ and Ωb.

We present the new solar radiospectrograph of the University of Athensoperating at the Thermopylae Station since 1996. Observations cover thefrequency range from 110 to 688 MHz. The radiospectrograph has a 7-meterparabolic antenna and two receivers operating in parallel. One is a sweepfrequency receiver and the other a multichannel acousto-optical receiver.The data acquisition system consists of a front-end VME based subsystem