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Three-dimensional Analyses of an Aspherical Coronal Mass Ejection and Its Driven Shock by Ying, Beili; Feng, Li; Inhester, Bernd; Mierla, Marilena; Gan, Weiqun; Lu, Lei; Li, Shuting is a scholarly article available to read on EtoBox.

What is Three-dimensional Analyses of an Aspherical Coronal Mass Ejection and Its Driven Shock about?

Context. Observations reveal that shocks can be driven by fast coronal mass ejections (CMEs) and play essential roles in particle accelerations. A critical ratio, $\delta$, derived from a shock standoff distance normalized by the radius of curvature (ROC) of a CME, allows us to estimate shock and ambient coronal parameters. However, true ROCs of CMEs are difficult to measure due to observed projection effects. Aims. We investigate the formation mechanism of a shock driven by an aspherical CME without evident lateral expansion. Through three-dimensional (3D) reconstructions without a priori assumptions of the object morphology, we estimate two principal ROCs of the CME surface and demonstrate how the difference between two principal ROCs of the CME affects the estimate of the coronal physical parameters. Methods. The CME was observed by the Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) instruments and the Large Angle and Spectrometric Coronagraph (LASCO). We used the mask-fitting method to obtain the irregular 3D shape of the CME and reconstructed the shock surface using the bow-shock model. Through smoothings with fifth-order polynomial functions and Monte Ca

Author

Ying, Beili; Feng, Li; Inhester, Bernd; Mierla, Marilena; Gan, Weiqun; Lu, Lei; Li, Shuting

Published

2022

Language

EN