Abstract Details
| Name: Hariharan Krishnan Affiliation: Indian Institute of Astrophysics Conference ID: ASI2016_491 Title : High Speed Digital Back-end for Observation of Low-Frequency Solar Radio Bursts Authors and Co-Authors : Hariharan Krishnan Indian Institute of Astrophysics Abstract Type : Poster Abstract Category : Instrumentation and Techniques Abstract : The Indian Institute of Astrophysics operates a low-frequency spectrograph system viz.Gauribidanur Low Frequency Solar Spectrograph (GLOSS)[1] operating in the frequency range 85-35 MHz located at the Gauribidanur Radio Observatory (about 100 km North of Bangalore, India). It is a phased array system of eight Log-periodic dipole antenna elements being operated in total power mode to record the dynamic spectrum over a period of 8 hours everyday. The GLOSS is primarily used for monitoring the radio transients from the solar corona which have a close association with flares and Coronal Mass Ejections (CMEs) from the lower layers of the Sun. The observatory also hosts a suite of other instruments (http://www.iiap.res.in/centers/radio) dedicated for regular observation of the radio emission from the solar corona in the afore mentioned frequency range which corresponds to a heliocentric distance of 1.2-1.8 solar radii in the solar atmosphere. A conventional sweep-frequency analyzer was used as the back-end for the spectrograph. As a part of the back-end upgrade process, a new digital back-end receiver based on high-speed ADC and FPGA data acquisition hardware was configured and tested with the spectrograph. The details of the hardware system along with trial observational results will be presented and discussed in the talk. |