Chromophores 6 Lomb-scargle periodogram 6 Stars 6 Stars: activity 6 Astrophysics 4 Chromosphere, active 4 Chromospheric activity 4 Flares, relation to magnetic field 4 Radio bursts, association with flares 4 Radio bursts, microwave 4 Stars: chromospheres 4 Stars: individual 4 Stars: solar types 4 X-ray bursts, association with flares 4 ACTIVIDAD CROMOSFERICA 2 ACTIVITY CYCLES 2 ATLAS OF SPECTRA 2 BIBLIOTECA DE ESPECTROS 2 CHROMOSPHERIC ACTIVITY 2 CICLOS DE ACTIVIDAD 2 Calcium 2 Chromospheric activities 2 Detecting activities 2 ESTRELLAS ENANAS TARDIAS 2 Earth (planet) 2 FLARES 2 FULGURACIONES 2 Flip flop circuits 2 HR 1099 2 Iron compounds 2