TRACING ELECTRON BEAMS IN THE SUN'S CORONA WITH RADIO DYNAMIC IMAGING SPECTROSCOPY

Bin, Chen; Bastian, T S; White, S M; Gary, D E; Perley, R; Rupen, M; Carlson, B

doi:10.1088/2041-8205/763/1/L21

Title: TRACING ELECTRON BEAMS IN THE SUN'S CORONA WITH RADIO DYNAMIC IMAGING SPECTROSCOPY

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Abstract

We report observations of type III radio bursts at decimeter wavelengths (type IIIdm bursts)-signatures of suprathermal electron beams propagating in the low corona-using the new technique of radio dynamic imaging spectroscopy provided by the recently upgraded Karl G. Jansky Very Large Array. For the first time, type IIIdm bursts were imaged with high time and frequency resolution over a broad frequency band, allowing electron beam trajectories in the corona to be deduced. Together with simultaneous hard X-ray and extreme ultraviolet observations, we show that these beams emanate from an energy release site located in the low corona at a height below {approx}15 Mm, and propagate along a bundle of discrete magnetic loops upward into the corona. Our observations enable direct measurements of the plasma density along the magnetic loops, and allow us to constrain the diameter of these loops to be less than 100 km. These overdense and ultra-thin loops reveal the fundamentally fibrous structure of the Sun's corona. The impulsive nature of the electron beams, their accessibility to different magnetic field lines, and the detailed structure of the magnetic release site revealed by the radio observations indicate that the localized energy release is highly fragmentary in time and space,more »« less

Authors:

Bin, Chen ^[1]; Bastian, T S ^[2]; White, S M ^[3]; Gary, D E ^[4]; Perley, R; Rupen, M ^[5]; Carlson, B ^[6]

Department of Astronomy, University of Virginia, Charlottesville, VA 22904 (United States)
National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)
Air Force Research Laboratory, Kirtland Air Force Base, New Mexico, NM (United States)
Center for Solar-Terrestrial Research, New Jersey Institute of Technology, Newark, NJ 07102 (United States)
National Radio Astronomy Observatory, Socorro, NM 87801 (United States)
National Research Council of Canada, Penticton, BC V2A 6J9 (Canada)

Publication Date:: Sun Jan 20 00:00:00 EST 2013

OSTI Identifier:: 22078314

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal Letters

Additional Journal Information:: Journal Volume: 763; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ELECTRON BEAMS; EXTREME ULTRAVIOLET RADIATION; HARD X RADIATION; HEIGHT; MAGNETIC FIELDS; PLASMA DENSITY; RESOLUTION; SOLAR CORONA; SPATIAL DISTRIBUTION; SPECTROSCOPY; TIME DEPENDENCE; TRAJECTORIES; WAVELENGTHS

Citation Formats


                    Bin, Chen, Bastian, T S, White, S M, Gary, D E, Perley, R, Rupen, M, and Carlson, B. TRACING ELECTRON BEAMS IN THE SUN'S CORONA WITH RADIO DYNAMIC IMAGING SPECTROSCOPY.  United States: N. p., 2013. 
        Web.  doi:10.1088/2041-8205/763/1/L21.

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                    Bin, Chen, Bastian, T S, White, S M, Gary, D E, Perley, R, Rupen, M, & Carlson, B. TRACING ELECTRON BEAMS IN THE SUN'S CORONA WITH RADIO DYNAMIC IMAGING SPECTROSCOPY.  United States.  https://doi.org/10.1088/2041-8205/763/1/L21

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                    Bin, Chen, Bastian, T S, White, S M, Gary, D E, Perley, R, Rupen, M, and Carlson, B. 2013.  
        "TRACING ELECTRON BEAMS IN THE SUN'S CORONA WITH RADIO DYNAMIC IMAGING SPECTROSCOPY".  United States.  https://doi.org/10.1088/2041-8205/763/1/L21.

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@article{osti_22078314,

  title        = {TRACING ELECTRON BEAMS IN THE SUN'S CORONA WITH RADIO DYNAMIC IMAGING SPECTROSCOPY},

  author       = {Bin, Chen and Bastian, T S and White, S M and Gary, D E and Perley, R and Rupen, M and Carlson, B},

  abstractNote = {We report observations of type III radio bursts at decimeter wavelengths (type IIIdm bursts)-signatures of suprathermal electron beams propagating in the low corona-using the new technique of radio dynamic imaging spectroscopy provided by the recently upgraded Karl G. Jansky Very Large Array. For the first time, type IIIdm bursts were imaged with high time and frequency resolution over a broad frequency band, allowing electron beam trajectories in the corona to be deduced. Together with simultaneous hard X-ray and extreme ultraviolet observations, we show that these beams emanate from an energy release site located in the low corona at a height below {approx}15 Mm, and propagate along a bundle of discrete magnetic loops upward into the corona. Our observations enable direct measurements of the plasma density along the magnetic loops, and allow us to constrain the diameter of these loops to be less than 100 km. These overdense and ultra-thin loops reveal the fundamentally fibrous structure of the Sun's corona. The impulsive nature of the electron beams, their accessibility to different magnetic field lines, and the detailed structure of the magnetic release site revealed by the radio observations indicate that the localized energy release is highly fragmentary in time and space, supporting a bursty reconnection model that involves secondary magnetic structures for magnetic energy release and particle acceleration.},

  doi          = {10.1088/2041-8205/763/1/L21},

  url          = {https://www.osti.gov/biblio/22078314},
  journal      = {Astrophysical Journal Letters},

  issn         = {2041-8205},

  number       = 1,

  volume       = 763,

  place        = {United States},

  year         = {Sun Jan 20 00:00:00 EST 2013},

  month        = {Sun Jan 20 00:00:00 EST 2013}

}

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