An Introduction to Modern Astrophysics · Problem 11.15
The Interstellar Medium and Star Formation — Carroll & Ostlie
Physics — Astrophysics · cme-kinetic-energy
Problem
Assume that the velocity of a CME directed toward Earth is 400km s−1 and that the mass of the CME is 1013 kg.
(a) Estimate the kinetic energy contained in the CME, and compare your answer to the energy released in a large flare. Express your answer as a percentage of the energy of the flare.
(b) Estimate the transit time for the CME to reach Earth.
(c) Briefly explain how astronomers are able to ``predict'' the occurrence of aurorae in advance of magnetic storms on Earth.