MPS Seminar: Effects of Coronal Eruptions Observed in the Chromosphere (M. Kirk)

  • Datum: 03.11.2016
  • Uhrzeit: 11:00 - 12:00
  • Vortragende(r): Michael Kirk
  • NASA Goddard Space Flight Center / CUA
  • Ort: MPS
  • Raum: Auditorium
  • Gastgeber: Hardi Peter
MPS Seminar: Effects of Coronal Eruptions Observed in the Chromosphere (M. Kirk)

Solar eruptions are complex processes most often characterized only in a single layer of the
solar atmosphere: flare ribbons, post-flare arcades, and coronal mass ejecta fronts.
Sequential Chromospheric Brightenings (SCBs) are often observed in the immediate vicinity of erupting chromospheric flares but are distinctly coronal in their origin. Since their initial discovery in 2005, we have found SCBs to be closely related to CME release. Over 77% of studied eruptions with SCBs have visible coronal mass ejections associated with them. Using an automated detection and tracking algorithm, we characterize SCBs in a wide variety solar flare intensities. After the algorithmic identification and a statistical analysis, we compare and find the following: SCBs are distinctly different from flare brightening in their temporal characteristics of intensity, Doppler structure, duration, and location properties. The appearance of SCBs often precedes peak flare intensity. They are also found to propagate laterally away from flare center in clusters at two distinct velocity groups. Given SCBs’ distinctive nature compared to flares, we suggest a physical triggering mechanism relating to SCBs’ origin, the associated flare, and coronal mass ejections.

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