Solar corona Electron density 6 Charged particles 4 Coronal heating 4 Mhd turbulence 4 Nanoflares 4 Solar energy 4 Solar radiation 4 Tomography 4 solar activity 4 Acoustic wave propagation 2 Boundary conditions 2 Clouds 2 Coronagraph 2 Coronal cavities 2 Coronal loops 2 Coronal mass ejections (CMEs) 2 Differential emission measure 2 Dissipation functions 2 Doppler effect 2 EUV imaging 2 Energy dissipation 2 Filaments 2 Geomagnetic storm 2 Geomagnetism 2 Image analysis 2 Intensity variations 2 Intermittency 2 Interplanetary magnetic clouds 2 Interplanetary space 2