First Taste of Hot Channel in Interplanetary Space
arXiv:1502.04408 · doi:10.1088/0004-637X/803/2/96
Abstract
Hot channel (HC) is a high temperature (10 MK) structure in the inner corona revealed first by Atmospheric Imaging Assembly (AIA) on board \textit{Solar Dynamics Observatory}. Eruption of HC is often associated with flare and coronal mass ejection. Previous studies suggest that HC is a good proxy of magnetic flux rope (MFR) in the inner corona, in addition to another well-known MFR candidate, the prominence-cavity structure that is with a normal coronal temperature (1-2 MK). In this paper, we report a high temperature structure (HTS, 1.5 MK) contained in an interplanetary coronal mass ejection induced by an HC eruption. According to the observations of bidirectional electrons, high temperature and density, strong magnetic field, and its association with the shock, sheath, and plasma pile-up region, we suggest that the HTS is the interplanetary counterpart of the HC. The scale of the measured HTS is around 14 R, and it maintained a much higher temperature than the background solar wind even at 1 AU. It is significantly different from the typical magnetic clouds (MCs), which usually have a much lower temperature. Our study suggests that the existence of a corotating interaction region ahead of the HC formed a magnetic container to inhibit the HC expansion and cooling down to a low temperature.
Accepted by the ApJ (17 pages, 5 figures)
References in corpus (9)
- Ideal kink instability of a magnetic loop equilibrium
- Observation of An Evolving Magnetic Flux Rope Prior To and During A Solar Eruption
- Observations of an extreme storm in interplanetary space caused by successive coronal mass ejections
- Connecting speeds, directions and arrival times of 22 coronal mass ejections from the Sun to 1 AU
- Formation of a Double-decker Magnetic Flux Rope in the Sigmoidal Solar Active Region 11520
- Kinematic Evolution of a Slow CME in Corona Viewed by STEREO-B on 8 October 2007
- Deflected propagation of a coronal mass ejection from the corona to interplanetary space
- On the Relationship Between a Hot-channel-like Solar Magnetic Flux Rope and its embedded Prominence
- Direct observations of magnetic flux rope formation during a solar coronal mass ejection