STEREO Observations of Quasi-Periodically Driven High Velocity Outflows in Polar Plumes
arXiv:1001.3377 · doi:10.1051/0004-6361/200913699
Abstract
Plumes are one of the most ubiquitous features seen at the limb in polar coronal holes and are considered to be a source of high density plasma streams to the fast solar wind. We analyze STEREO observations of plumes and aim to reinterpret and place observations with previous generations of EUV imagers within a new context that was recently developed from Hinode observations. We exploit the higher signal-to-noise, spatial and temporal resolution of the EUVI telescopes over that of SOHO/EIT to study the temporal variation of polar plumes in high detail. We employ recently developed insight from imaging (and spectral) diagnostics of active region, plage, and quiet Sun plasmas to identify the presence of apparent motions as high-speed upflows in magnetic regions as opposed to previous interpretations of propagating waves. In almost all polar plumes observed at the limb in these STEREO sequences, in all coronal passbands, we observe high speed jets of plasma traveling along the structures with a mean velocity of 135km/s at a range of temperatures from 0.5-1.5MK. The jets have an apparent brightness enhancement of ~5% above that of the plumes they travel on and repeat quasi-periodically, with repeat-times ranging from five to twenty-five minutes. We also notice a very weak, fine scale, rapidly evolving, but ubiquitous companion of the plumes that covers the entire coronal hole limb. The observed jets are remarkably similar in intensity enhancement, periodicity and velocity to those observed in other magnetic regions of the solar atmosphere. They are multi-thermal in nature. We infer that the jets observed on the plumes are a source of heated mass to the fast solar wind. Further, based on the previous results that motivated this study, we suggest that these jets originated in the upper chromosphere.
arXiv comment4 pages, 4 figures. Accepted to appear in A&A Letters. Movies supporting the Letter can be found in http://download.hao.ucar.edu/pub/mscott/papers/Plumes/
References in corpus (12)
- Ionization balance for optically thin plasmas: rate coefficients for all atoms and ions of the elements H to Ni
- A Tale Of Two Spicules: The Impact of Spicules on the Magnetic Chromosphere
- Observing the Roots of Solar Coronal Heating - in the Chromosphere
- A turbulence-driven model for heating and acceleration of the fast wind in coronal holes
- On-disk counterparts of type II spicules in the Ca II 854.2 nm and Halpha lines
- Hinode/EIS observations of propagating low-frequency slow magnetoacoustic waves in fan-like coronal loops
- Ubiquitous High Speed Transition Region and Coronal Upflows in the Quiet Sun
- Observing Episodic Coronal Heating Events Rooted in Chromospheric Activity
- Observational Signatures of Simulated Reconnection Events in the Solar Chromosphere and Transition Region
- Propagating waves in polar coronal holes as seen by SUMER and EIS
- Observations Supporting the Role of Magnetoconvection in Energy Supply to the Quiescent Solar Atmosphere
- A Coherence-Based Approach for Tracking Waves in the Solar Corona
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- Spectroscopic Observations of Propagating Disturbances in a Polar Coronal Hole: Evidence of Slow Magneto-acoustic Waves
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