Solar Physics

, Volume 145, Issue 1, pp 169–188 | Cite as

The three-dimensional structure of ‘loop-like’ coronal mass ejections

  • R. M. MacQueen
Article

Abstract

We have measured the brightness and latitudinal extent of the depleted (cavity) region behind the leading edge of three coronal mass ejection (CME) events from the Skylab epoch. The events chosen are among those believed to be typical of non-impulsive, ‘loop-like’ CMEs (Sime, MacQueen, and Hundhausen, 1984). The pre-event coronal brightness has been matched by a model corona, assuming both a background contribution and a contribution from a range of hypothetical streamer models, distinguished by differing longitudinal extent. Then, assuming that the cavities are voided regions in which the local electron density is negligible, we estimate their minimum line-of-sight extent and find them to be comparable to, or greater than, their measured latitudinal extent. As a result, we suggest this unambiguously demonstrates the three-dimensional nature of these — and likely, this class of — events.

Keywords

Coronal Mass Ejection Local Electron Background Contribution Streamer Model Local Electron Density 

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • R. M. MacQueen
    • 1
  1. 1.Rhodes CollegeMemphisUSA

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