Abstract Details

Name: Durgesh Tripathi
Affiliation: IUCAA
Conference ID: ASI2021_157
Title : A unified scenario for the heating of the corona in quiet Sun, coronal holes and formation of Solar Wind
Authors and Co-Authors : Durgesh Tripathi, IUCAA, Pune, India V. N. Nived, Armagh Observatory, UK S. K. Solanki, MPS, Goettingen, Germany
Abstract Type : Oral
Abstract Category : Sun and the Solar System
Abstract : We study the similarities and differences between quiet Sun and coronal holes using the \ion{Si}{4}~1394~Å line recorded by the Interface Region Imaging Spectrograph (IRIS). We combine these observations with the magnetic field distribution on the photosphere measured by the Helioseismic and Magnetic Imager (HMI). We find that for the regions with identical magnetic flux densities, the \ion{Si}{4} line intensities obtained in CHs are lower than those obtained in QS and that the difference increases with increasing magnetic flux. Also, QS line profiles are more redshifted than those measured in CHs. Moreover, with increasing magnetic flux density, the blue shifts measured in CHs increased, as opposed to the QS. However, the non-thermal velocities in QS, as well as in CHs, did not show any significant difference. We have used these results to propose a unified model that helps us explain the heating of the corona in the QS and CHs and the solar wind formation.