skip to main content

Title: THE ENERGETICS OF A GLOBAL SHOCK WAVE IN THE LOW SOLAR CORONA

As the most energetic eruptions in the solar system, coronal mass ejections (CMEs) can produce shock waves at both their front and flanks as they erupt from the Sun into the heliosphere. However, the amount of energy produced in these eruptions, and the proportion of their energy required to produce the waves, is not well characterized. Here we use observations of a solar eruption from 2014 February 25 to estimate the energy budget of an erupting CME and the globally propagating ''EIT wave'' produced by the rapid expansion of the CME flanks in the low solar corona. The ''EIT wave'' is shown using a combination of radio spectra and extreme ultraviolet images to be a shock front with a Mach number greater than one. Its initial energy is then calculated using the Sedov-Taylor blast-wave approximation, which provides an approximation for a shock front propagating through a region of variable density. This approach provides an initial energy estimate of ≈2.8 × 10{sup 31} erg to produce the ''EIT wave'', which is approximately 10% the kinetic energy of the associated CME (shown to be ≈2.5 × 10{sup 32} erg). These results indicate that the energy of the ''EIT wave'' may be significant and must be consideredmore » when estimating the total energy budget of solar eruptions.« less
Authors:
; ;  [1] ; ; ;  [2]
  1. Mullard Space Science Laboratory (UCL), Holmbury St. Mary, Dorking, Surrey RH5 6NT (United Kingdom)
  2. Astrophysics Research Group, School of Physics, Trinity College Dublin, Dublin 2 (Ireland)
Publication Date:
OSTI Identifier:
22364309
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 799; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; DENSITY; EXTREME ULTRAVIOLET RADIATION; HELIOSPHERE; KINETIC ENERGY; MACH NUMBER; MASS; SHOCK WAVES; SOLAR CORONA; SOLAR SYSTEM; SUN; WAVE PROPAGATION