www.nature.com/articles/s41...
"ANS activity responds to changes in geomagnetic & solar activity"
↑solar wind = ↑HR
↑cosmic rays, solar radio flux, Schumann resonance power = ↑HRV & parasympathetic activity
thejemfoundation.com/how-solar-er...
thejemfoundation.com/how-solar-er...