Table of Contents

Part I. New Solar Facilities and Multi-Mission Science; Solar Physics in the 2020s: DKIST, Parker Solar Probe and Solar Orbiter as a multi-messenger constellation V. Martinez Pillet et al; The Aditya-L1 mission of ISRO Durgesh Tripathi et al; Solar observations with ALMA: A new frontier T. S. Bastian; Modeling efforts for multi-mission science C. Sasso and A. P. Rouillard; Part II. Magnetic Fields – Generation, Activity, and Instabilities: Solar flare-CME association Ting Li; Origin of extreme solar eruptive activity from the active region NOAA 12673 and the largest flare of solar cycle 24 Bhuwan Joshi and Prabir K. Mitra; Solar cycles reconstructed over the last millennium: Do Waldmeier and Gnevysev-Ohl rules work? Markus Similä and Ilya Usoskin; Study of ionospheric behaviour during the intense geomagnetic storms in 24th solar cycle over different latitudes and longitudes Bhupendra Malvi, Sharad C. Tripathi and P. K. Purohit; Power spectra of the Sun's large-scale magnetic field during solar cycles 23 and 24 Yukun Luo, Jie Jiang and Ruihui Wang; Long-term evolution of magnetic field proxies as deduced from archival data Dipankar Banerjee et al; Observational signature of tilt quenching of bipolar magnetic regions in the Sun Bibhuti Kumar Jha, Bidya Binay Karak and Dipankar Banerjee; Photospheric magnetic field variation during solar flares and their implication for the generation of sunquakes S. Vargas Domínguez, W. Caicedo Tez and J. C. Buitrago Casas; A new mechanism for the butterfly diagram of the solar cycle Zebin Zhang, Jie Jiang and Haowei Zhang; Automatic detection of solar active regions from SOHO/MDI and SDO/HMI synoptic magnetograms Ruihui Wang, Jie Jiang and Yukun Luo; Automatic algorithm for tracking bipolar magnetic regions Anu B. Sreedevi and Bibhuti Kuma Jha; Part III. Solar Atmosphere and Solar Wind: How has the solar wind evolved to become what it is today? A. A. Vidotto; Spectroscopic Detection of Alfvénic MHD waves in the sunspot chromosphere Jongchul Chae; Self-consistent nanoflare heating in model active regions: MHD avalanches in curved coronal arcades J. Reid, J. Threlfall and A. W. Hood; Study of the impact of coronal rain on kink oscillations of coronal loops Arpit Kumar Shrivastav and Vaibhav Pant; Understanding Weak Impulsive Narrowband Quiet Sun Emissions (WINQSEs) Divya Oberoi et al; Spatio-temporal characterization of hot chromospheric fibrils Parker Lamb, Gianna Cauzzi and Kevin Reardon; Part IV: Machine Learning in Solar Physics: Application of deep learning to solar and space weather data Yong-Jae Moon et al.

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Examines the most pressing scientific questions in solar astrophysics, and how to maximise the output of major observational facilities.