Low Altitude Solar Magnetic Reconnection, Type III Solar Radio Bursts, and X-ray Emissions

I. H. Cairns, V. V. Lobzin, A. Donea, S. J. Tingay, P. I. McCauley, D. Oberoi, R. T. Duffin, M. J. Reiner, N. Hurley-Walker, N. A. Kudryavtseva, D. B. Melrose, J. C. Harding, G. Bernardi, Judd Bowman, R. J. Cappallo, B. E. Corey, A. Deshpande, D. Emrich, R. Goeke, B. J. HazeltonM. Johnston-Hollitt, D. L. Kaplan, J. C. Kasper, E. Kratzenberg, C. J. Lonsdale, M. J. Lynch, S. R. McWhirter, D. A. Mitchell, M. F. Morales, E. Morgan, S. M. Ord, T. Prabu, A. Roshi, N. Udaya Shankar, K. S. Srivani, R. Subrahmanyan, R. B. Wayth, M. Waterson, R. L. Webster, A. R. Whitney, A. Williams, C. L. Williams

Research output: Contribution to journalArticle

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Abstract

Type III solar radio bursts are the Sun's most intense and frequent nonthermal radio emissions. They involve two critical problems in astrophysics, plasma physics, and space physics: how collective processes produce nonthermal radiation and how magnetic reconnection occurs and changes magnetic energy into kinetic energy. Here magnetic reconnection events are identified definitively in Solar Dynamics Observatory UV-EUV data, with strong upward and downward pairs of jets, current sheets, and cusp-like geometries on top of time-varying magnetic loops, and strong outflows along pairs of open magnetic field lines. Type III bursts imaged by the Murchison Widefield Array and detected by the Learmonth radiospectrograph and STEREO B spacecraft are demonstrated to be in very good temporal and spatial coincidence with specific reconnection events and with bursts of X-rays detected by the RHESSI spacecraft. The reconnection sites are low, near heights of 5-10 Mm. These images and event timings provide the long-desired direct evidence that semi-relativistic electrons energized in magnetic reconnection regions produce type III radio bursts. Not all the observed reconnection events produce X-ray events or coronal or interplanetary type III bursts; thus different special conditions exist for electrons leaving reconnection regions to produce observable radio, EUV, UV, and X-ray bursts.

Original languageEnglish (US)
Article number1676
JournalScientific Reports
Volume8
Issue number1
DOIs
StatePublished - Dec 1 2018

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solar radio bursts
low altitude
bursts
x rays
spacecraft
STEREO (observatory)
radio bursts
nonthermal radiation
helioseismology
plasma physics
current sheets
radio emission
cusps
observatories
astrophysics
sun
electrons
kinetic energy
time measurement
physics

ASJC Scopus subject areas

  • General

Cite this

Cairns, I. H., Lobzin, V. V., Donea, A., Tingay, S. J., McCauley, P. I., Oberoi, D., ... Williams, C. L. (2018). Low Altitude Solar Magnetic Reconnection, Type III Solar Radio Bursts, and X-ray Emissions. Scientific Reports, 8(1), [1676]. https://doi.org/10.1038/s41598-018-19195-3

Low Altitude Solar Magnetic Reconnection, Type III Solar Radio Bursts, and X-ray Emissions. / Cairns, I. H.; Lobzin, V. V.; Donea, A.; Tingay, S. J.; McCauley, P. I.; Oberoi, D.; Duffin, R. T.; Reiner, M. J.; Hurley-Walker, N.; Kudryavtseva, N. A.; Melrose, D. B.; Harding, J. C.; Bernardi, G.; Bowman, Judd; Cappallo, R. J.; Corey, B. E.; Deshpande, A.; Emrich, D.; Goeke, R.; Hazelton, B. J.; Johnston-Hollitt, M.; Kaplan, D. L.; Kasper, J. C.; Kratzenberg, E.; Lonsdale, C. J.; Lynch, M. J.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Ord, S. M.; Prabu, T.; Roshi, A.; Shankar, N. Udaya; Srivani, K. S.; Subrahmanyan, R.; Wayth, R. B.; Waterson, M.; Webster, R. L.; Whitney, A. R.; Williams, A.; Williams, C. L.

In: Scientific Reports, Vol. 8, No. 1, 1676, 01.12.2018.

Research output: Contribution to journalArticle

Cairns, IH, Lobzin, VV, Donea, A, Tingay, SJ, McCauley, PI, Oberoi, D, Duffin, RT, Reiner, MJ, Hurley-Walker, N, Kudryavtseva, NA, Melrose, DB, Harding, JC, Bernardi, G, Bowman, J, Cappallo, RJ, Corey, BE, Deshpande, A, Emrich, D, Goeke, R, Hazelton, BJ, Johnston-Hollitt, M, Kaplan, DL, Kasper, JC, Kratzenberg, E, Lonsdale, CJ, Lynch, MJ, McWhirter, SR, Mitchell, DA, Morales, MF, Morgan, E, Ord, SM, Prabu, T, Roshi, A, Shankar, NU, Srivani, KS, Subrahmanyan, R, Wayth, RB, Waterson, M, Webster, RL, Whitney, AR, Williams, A & Williams, CL 2018, 'Low Altitude Solar Magnetic Reconnection, Type III Solar Radio Bursts, and X-ray Emissions', Scientific Reports, vol. 8, no. 1, 1676. https://doi.org/10.1038/s41598-018-19195-3
Cairns, I. H. ; Lobzin, V. V. ; Donea, A. ; Tingay, S. J. ; McCauley, P. I. ; Oberoi, D. ; Duffin, R. T. ; Reiner, M. J. ; Hurley-Walker, N. ; Kudryavtseva, N. A. ; Melrose, D. B. ; Harding, J. C. ; Bernardi, G. ; Bowman, Judd ; Cappallo, R. J. ; Corey, B. E. ; Deshpande, A. ; Emrich, D. ; Goeke, R. ; Hazelton, B. J. ; Johnston-Hollitt, M. ; Kaplan, D. L. ; Kasper, J. C. ; Kratzenberg, E. ; Lonsdale, C. J. ; Lynch, M. J. ; McWhirter, S. R. ; Mitchell, D. A. ; Morales, M. F. ; Morgan, E. ; Ord, S. M. ; Prabu, T. ; Roshi, A. ; Shankar, N. Udaya ; Srivani, K. S. ; Subrahmanyan, R. ; Wayth, R. B. ; Waterson, M. ; Webster, R. L. ; Whitney, A. R. ; Williams, A. ; Williams, C. L. / Low Altitude Solar Magnetic Reconnection, Type III Solar Radio Bursts, and X-ray Emissions. In: Scientific Reports. 2018 ; Vol. 8, No. 1.
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abstract = "Type III solar radio bursts are the Sun's most intense and frequent nonthermal radio emissions. They involve two critical problems in astrophysics, plasma physics, and space physics: how collective processes produce nonthermal radiation and how magnetic reconnection occurs and changes magnetic energy into kinetic energy. Here magnetic reconnection events are identified definitively in Solar Dynamics Observatory UV-EUV data, with strong upward and downward pairs of jets, current sheets, and cusp-like geometries on top of time-varying magnetic loops, and strong outflows along pairs of open magnetic field lines. Type III bursts imaged by the Murchison Widefield Array and detected by the Learmonth radiospectrograph and STEREO B spacecraft are demonstrated to be in very good temporal and spatial coincidence with specific reconnection events and with bursts of X-rays detected by the RHESSI spacecraft. The reconnection sites are low, near heights of 5-10 Mm. These images and event timings provide the long-desired direct evidence that semi-relativistic electrons energized in magnetic reconnection regions produce type III radio bursts. Not all the observed reconnection events produce X-ray events or coronal or interplanetary type III bursts; thus different special conditions exist for electrons leaving reconnection regions to produce observable radio, EUV, UV, and X-ray bursts.",
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AU - Cairns, I. H.

AU - Lobzin, V. V.

AU - Donea, A.

AU - Tingay, S. J.

AU - McCauley, P. I.

AU - Oberoi, D.

AU - Duffin, R. T.

AU - Reiner, M. J.

AU - Hurley-Walker, N.

AU - Kudryavtseva, N. A.

AU - Melrose, D. B.

AU - Harding, J. C.

AU - Bernardi, G.

AU - Bowman, Judd

AU - Cappallo, R. J.

AU - Corey, B. E.

AU - Deshpande, A.

AU - Emrich, D.

AU - Goeke, R.

AU - Hazelton, B. J.

AU - Johnston-Hollitt, M.

AU - Kaplan, D. L.

AU - Kasper, J. C.

AU - Kratzenberg, E.

AU - Lonsdale, C. J.

AU - Lynch, M. J.

AU - McWhirter, S. R.

AU - Mitchell, D. A.

AU - Morales, M. F.

AU - Morgan, E.

AU - Ord, S. M.

AU - Prabu, T.

AU - Roshi, A.

AU - Shankar, N. Udaya

AU - Srivani, K. S.

AU - Subrahmanyan, R.

AU - Wayth, R. B.

AU - Waterson, M.

AU - Webster, R. L.

AU - Whitney, A. R.

AU - Williams, A.

AU - Williams, C. L.

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AB - Type III solar radio bursts are the Sun's most intense and frequent nonthermal radio emissions. They involve two critical problems in astrophysics, plasma physics, and space physics: how collective processes produce nonthermal radiation and how magnetic reconnection occurs and changes magnetic energy into kinetic energy. Here magnetic reconnection events are identified definitively in Solar Dynamics Observatory UV-EUV data, with strong upward and downward pairs of jets, current sheets, and cusp-like geometries on top of time-varying magnetic loops, and strong outflows along pairs of open magnetic field lines. Type III bursts imaged by the Murchison Widefield Array and detected by the Learmonth radiospectrograph and STEREO B spacecraft are demonstrated to be in very good temporal and spatial coincidence with specific reconnection events and with bursts of X-rays detected by the RHESSI spacecraft. The reconnection sites are low, near heights of 5-10 Mm. These images and event timings provide the long-desired direct evidence that semi-relativistic electrons energized in magnetic reconnection regions produce type III radio bursts. Not all the observed reconnection events produce X-ray events or coronal or interplanetary type III bursts; thus different special conditions exist for electrons leaving reconnection regions to produce observable radio, EUV, UV, and X-ray bursts.

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