skip to main content

Title: Mechanisms and observations of coronal dimming for the 201 August 7 event

Coronal dimming of extreme ultraviolet (EUV) emission has the potential to be a useful forecaster of coronal mass ejections (CMEs). As emitting material leaves the corona, a temporary void is left behind which can be observed in spectral images and irradiance measurements. The velocity and mass of the CMEs should impact the character of those observations. However, other physical processes can confuse the observations. We describe these processes and the expected observational signature, with special emphasis placed on the differences. We then apply this understanding to a coronal dimming event with an associated CME that occurred on 2010 August 7. Data from the Solar Dynamics Observatory's Atmospheric Imaging Assembly and EUV Variability Experiment (EVE) are used for observations of the dimming, while the Solar and Heliospheric Observatory's Large Angle and Spectrometric Coronagraph and the Solar Terrestrial Relations Observatory's COR1 and COR2 are used to obtain velocity and mass estimates for the associated CME. We develop a technique for mitigating temperature effects in coronal dimming from full-disk irradiance measurements taken by EVE. We find that for this event, nearly 100% of the dimming is due to mass loss in the corona.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303 (United States)
  2. NASA Goddard Space Flight Center, Greenbelt, MD (United States)
  3. Space Vehicles Directorate, U.S. Air Force Research Laboratory, Kirtland Air Force Base, NM (United States)
Publication Date:
OSTI Identifier:
22356471
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 789; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DATA ANALYSIS; EMISSION; EXTREME ULTRAVIOLET RADIATION; IMAGES; MASS TRANSFER; RADIANT FLUX DENSITY; STELLAR CORONAE; STELLAR WINDS; SUN; TEMPERATURE DEPENDENCE