A broad stream of electron particles bursting upward from the surface of the sun is called a coronal mass ejection (CME).

Here's why:

* Coronal Mass Ejections (CMEs): CMEs are massive bursts of plasma and magnetic field from the Sun's corona (the outermost layer of the Sun's atmosphere). They often contain billions of tons of matter and travel at speeds of hundreds of kilometers per second.

* Electron Particles: CMEs contain a mix of charged particles, including electrons, protons, and heavier ions.

While CMEs are primarily associated with large-scale eruptions, they do involve a significant ejection of electron particles.