Our Sun is an active star, constantly emitting energy and particles in the form of solar flares and coronal mass ejections. These disturbances create "Space Weather," which affects Earth's atmosphere, satellite communications, and power grids.
The Schumann Resonance is a natural electromagnetic phenomenon caused by lightning activity within the Earth's atmosphere. It produces standing waves that resonate in the cavity between the Earth's surface and the ionosphere.
AIA 304 - Solar Region: Transition Region_Chromosphere, Emitted by helium-2 (He II) at temperatures around 50,000 Kelvin.
AIA 131 - Solar Region: Corona_Flaring Regions, Emitted by iron-20 (Fe XX) and iron-23 (Fe XXIII) at temperatures greater than 10,000,000 Kelvin.
AIA 193 - Solar Region: Corona_Flare Plasma, Emitted by iron-12 (Fe XII) at 1,000,000 K and iron 24 (Fe XXIV) at temperatures of 20,000,000 Kelvin.