Measurements of very-low frequency radio signal phase and amplitude can detect upper atmosphere changes caused by solar flares, enabling us to monitor flare occurrence and intensity.
Solar Flares and Impact on Earth
On Feb. 24, 2014, the sun emitted a significant solar flare
NASA SVS
Helio4Cast
Solar Flares FAQs – Solar Cycle 25
ESA - Solar Orbiter and SOHO's view of a giant eruption – close up
solar activity Archives - Page 4 of 9 - Eos
Most intense' solar flare captured on stunning imagery
Ionospheric monitoring with the Chilean GPS eyeball during the
ARTEMIS
Primer on the Solar Space Environment
Atmosphere, Free Full-Text