Solar Flares Are Hotter Than Scientists Ever Imagined Scientists just discovered that solar flares are way hotter than we thought. These giant explosions on the Sun don’t just heat up to a few million degrees—they can blast ions to around 60 million degrees Celsius, hotter than anything we imagined. For years, researchers only measured the electrons, but now we know the ions can stay scorching hot for minutes after a flare. This new insight could change how we predict space weather, which affect