Sun: chromosphere Sun: flares 9 Sun: radio radiation 9 Sun 8 Sun: corona 8 Hydromagnetics 4 Magnetic fields 4 Stars: chromospheres 4 Sun: activity 4 Sun: atmosphere 4 Sun: general 4 Sun: photosphere 4 Acceleration of particles 2 Arch filament systems 2 Astrophysics 2 Atomic processes 2 Chromosphere 2 Complex relationships 2 Cooling 2 Doppler radar 2 Electromagnetic wave emission 2 Energy dissipation 2 High-energy particles 2 Line: formation 2 Line: profiles 2 Magnetic bald patches 2 Magnetic flux 2 Magnetic measuring instruments 2 Magnetohydrodynamics 2 Magnetohydrodynamics (MHD) 2