Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0905z&link_type=abstract
American Astronomical Society, SPD meeting #42, #9.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
In white light coronagraph images, the brightness morphology of a CME often has a 3-part structure: a semi-circular-shaped bright leading front, a dark cavity enclosed by the leading front, and a blob-like core inside the cavity. It is believed that the underlying magnetic structure of a CME is a flux rope that consists of helical field lines wrapping around the central axis. Nevertheless, the relationship between the flux rope and CME cavity and core is poorly understood. We look into these issues using recent SDO observations. CME cavity and immediate leading front are observed in AIA passbands of low coronal temperatures (AIA 171 Å, 193 Å, 211 Å and 335 Å ), while CME core can be observed as an elongated hot channel in the AIA passbands of hot temperatures (AIA 94 Å and 131 Å). The hot channel initially appears in the shape of a sigmoid as viewed from the top, and a low lying central-dipped structure as viewed from the sides. Later, the hot channel starts to rise slowly and separates from the sigmoid. This slow-rise phase can last tens of minutes. In the meantime, the entire overlying arcade field starts to expand and develops into the cavity structure. As it rises, the hot channel appears closer to be a semi-circular loop, resembling the envisioned flux-rope shape. In this phase, these features are illuminated by EUV emissions, without apparent signature in GOES X-ray. However, this phase is followed by a sudden fast acceleration of the hot channel, strong expansion of the cool cavity, and the onset of the GOES X-ray flare (also flaring in EUV and other EM wavelengths). Based on the early examination of a limited number of eruptive events, we conclude that the flux rope exists before CME eruption, and later becomes the core of CME.
Cheng Xiande
Zhang Jie
No associations
LandOfFree
Cme Cavity, Core And Flux Rope: New Insights From Sdo And Stereo Observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cme Cavity, Core And Flux Rope: New Insights From Sdo And Stereo Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cme Cavity, Core And Flux Rope: New Insights From Sdo And Stereo Observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-943404