6–10 Sept 2021
Online
Europe/Rome timezone

Calibration of solar images at high radio frequencies through Cassiopeia A Supernova Remnant

8 Sept 2021, 14:52
13m
Online

Online

Poster Session 3 - Fundamental Plasma Processes in the Solar Atmosphere: Magnetic Reconnection, Waves, Emission, Particle Acceleration Poster Session 7.4

Speaker

Sara Mulas (Università degli Studi di Cagliari)

Description

The solar radio emission is usually divided into three parts depending of the time scale of the events: (1) the quiet Sun as a background emission, (2) a slowly varying component mostly associated with the active regions and (3) occasional extreme and sudden energetic phenomena like coronal mass ejections and flares. The quiet Sun emission comes from thermal bremsstrahlung in local thermodynamic equilibrium, therefore it has the advantage to be well understood and modeled compared to other frequencies.
The SunDish project aims to map and monitor the Sun at high radio frequencies with the Sardinia and Medicina Radio telescopes. In the framework of solar observations there is a lack of precise calibrated measurements in the K-band frequency range (18-26 GHz). We therefore perform observations in the K-band and in prospective we are going to extend our range up to 100 GHz.
In this work we present calibrated Sun maps by using the Supernova Remnant Cassiopeia A. This is a challenging procedure since this calibrator is an extended source and is currently in expansion. Due to its strong flux Cassiopeia A presents several advantages compared to other standard calibrators and its brightness variation is well study in literature. We find that Cassiopeia A is a very reliable calibrator for observations of the radio Sun. Due to the calibrator visibility at our telescopes latitude, it is possible to obtain accurately calibrated Sun maps throughout the day.

Primary author

Sara Mulas (Università degli Studi di Cagliari)

Co-authors

Alberto paolo Pellizzoni Simona Righini (Istituto Nazionale di Astrofisica (INAF)) Dr Maria Noemi Iacolina (ASI) Marco Marongiu (Istituto Nazionale di Astrofisica (INAF)) Giulia Murtas (University of Exeter) Dr Valente Giuseppe (ASI) Dr Elise Egron (Istituto Nazionale di Astrofisica ) Andrea Maccaferri (Istituto Nazionale di Astrofisica (INAF)) Dr Alessandro Orfei (Istituto Nazionale di Astrofisica) Giuseppe Pupillo (Istituto Nazionale di Astrofisica (INAF)) Alessandra Zanichelli (Istituto Nazionale di Astrofisica (INAF)) Franco Buffa Dr Raimondo Concu (Istituto Nazionale di Astrofisica) Gian Luigi Deiana (Istituto Nazionale di Astrofisica (INAF)) Dr Adelaide Ladu (Istituto Nazionale di Astrofisica) Andrea Melis Alessandro Navarrini (Istituto Nazionale di Astrofisica (INAF)) Dr Pierluigi Ortu (OAC) Dr Pili Mauro (Istituto Nazionale di Astrofisica) Tonino Pisanu (Istituto Nazionale di Astrofisica (INAF)) Dr Luca Schirru (Istituto Nazionale di Astrofisica) Dr Pasqualino Marongiu (OAC) Dr Matteo Bachetti (Istituto Nazionale di Astrofisica (INAF)) Andrea Saba (Istituto Nazionale di Astrofisica (INAF)) Dr Gianpaolo Serra (ASI) Dr Sara Loru (Istituto Nazionale di Astrofisica) Salvatore Luigi Guglielmino (Istituto Nazionale di Astrofisica (INAF)) Dr Caterina Tiburzi (ASTRON) Dr Pietro Zucca (ASTRON, The Netherlands Institute for Radio Astronomy) Prof. Mauro Messerotti (Istituto Nazionale di Astrofisica (INAF))

Presentation materials