JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Poster

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM18] [EE] Origin of Earth-affecting Coronal Mass Ejections

Wed. May 24, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:No? Lugaz(University of New Hampshire Main Campus), Kanya Kusano(Institute for Space-Earth Environmental Research, Nagoya University), Neel P Savani(NASA GSFC / University of Maryland Baltimore County), Ayumi Asai(Astronomical Observatory, Kyoto University)

[PEM18-P05] Statistical analysis for CME topology in the low corona

*Neel P Savani1, Angelos Vourlidas2 (1.NASA GSFC / UMBC, 2.JHU APL)

Keywords:Coronal mass ejections, magnetic field, Bz forecasting

The direction of magnetic vectors within coronal mass ejections, CMEs, has significant importance for forecasting terrestrial behavior. We have developed a technique to estimate the time-varying magnetic field at Earth for periods within CMEs (Savani et al 2015, 2016). The technique can be regarded as the aggregate from two significant contributions: 1) Estimating the initial topological structure of the CME and 2) Estimating the hypothetical Earth-trajectory after CME evolutionary effects have been considered. In this presentation, we study the applicability of using a simplified scheme to estimate the CME topology from two parameters; the solar cycle and solar hemisphere. We show that statistical improvements for estimating the CME topology can be made by including additional parameters for more complex events that occur less frequently. We describe how identifying the polarity of the leading edge from post flare arcades at the source of the CME is an example of one of these parameters.