3D reconstructions of EUV wave front heights and their influence on wave kinematics

Abstract

EUV waves are large-scale disturbances in the solar corona initiated by coronal mass ejections. However, solar EUV images show only the wave fronts projections along the line-of-sight of the spacecraft. We perform 3D reconstructions of EUV wave front heights using multi-point observations from STEREO-A and STEREO-B, and study their evolution to properly estimate the EUV wave kinematics. We develop two different methods to solve the matching problem of the EUV wave crest on pairs of STEREO-A/-B images by combining epipolar geometry with the investigation of perturbation profiles. The proposed approaches are applicable at the early and maximum stage of the event when STEREO-A/-B see different facets of the EUV wave, but also at the later stage when the wave front becomes diffusive and faint. The techniques developed are demonstrated on two events observed at different separation of the STEREO spacecraft (42${}^{\circ }$ and 91${}^{\circ }$). For the 7 December 2007 event, we find that the emission of the EUV wave front mainly comes from a height range up to 90-104 Mm, decreasing later to 7-35 Mm. Including the varying height of the EUV wave front allows us to correct the wave kinematics for the projection effects, resulting in velocities in the range 217-266 km/s. For the 13 February 2009 event, the wave front height doubled from 54 to 93 Mm over 10 min, and the velocity derived is 205-208 km/s. In the two events under study, the corrected speeds differ by up to 25% from the uncorrected ones, depending on the wave front height evolution.

19 pages, 10 figures, accepted for publication in the Astrophysical Journal

References in corpus (8)

• Advances in Observing Various Coronal EUV Waves in the SDO Era and Their Seismological Applications (Invited Review)
• High cadence observations of a global coronal wave by EUVI/STEREO
• The Kinematics of a Globally Propagating Disturbance in the Solar Corona
• Understanding the Physical Nature of Coronal "EIT Waves"
• Statistical Analysis of Large-scale EUV Waves Observed by STEREO/EUVI
• Case Study of Four Homologous Large-Scale Coronal Waves Observed on 2010 April 28 and 29
• Stereoscopic Polar Plume Reconstructions from Stereo/Secchi Images
• Nonlinear force-free coronal magnetic stereoscopy

Cited by in corpus (12)

• The 17 April 2021 widespread solar energetic particle event
• Using radio triangulation to understand the origin of two subsequent type II radio bursts
• Coronal dimmings associated with coronal mass ejections on the solar limb
• Statistical Approach on Differential EmissionMeasure of Coronal Holes using the CATCH Catalog
• On the three-dimensional relation between the coronal dimming, erupting filament and CME. Case study of the 28 October 2021 X1.0 event
• The 2019 International Women's Day event: A two-step solar flare with multiple eruptive signatures and low Earth impact
• Identifying the energy release site in a Solar microflare with a jet
• Tracking magnetic flux and helicity from Sun to Earth -- Multi-spacecraft analysis of a magnetic cloud and its solar source
• Coronal dimmings as indicators of early CME propagation direction
• Three-part structure of solar coronal mass ejection observed in low coronal signatures of Solar Orbiter
• Limb Observations of Global Solar Coronal Extreme-ultraviolet Wavefronts: The Inclination, Kinematics, Coupling with the Expanding Coronal Mass Ejections, and Connection with the Coronal Mass Ejection Driven Shocks
• Investigation of the Two-Dimensional Velocity Field of the Large-Scale Coronal Wave from September 6, 2011 using the SOLERwave Tool