Twisting flux tubes as a cause of micro-flaring activity

D.B. Jess; R.T.J. McAteer; M. Mathioudakis; F.P. Keenan; A. Andic; D.S. Bloomfield

doi:10.1051/0004-6361:20077916

Twisting flux tubes as a cause of micro-flaring activity

D.B. Jess, R.T.J. McAteer, M. Mathioudakis, F.P. Keenan, A. Andic, D.S. Bloomfield

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

High-cadence optical observations of an H-alpha blue-wing bright point near solar AR NOAA 10794 are presented. The data were obtained with the Dunn Solar Telescope at the National Solar Observatory/Sacramento Peak using a newly developed camera system, the RAPID DUAL IMAGER. Wavelet analysis is undertaken to search for intensity-related oscillatory signatures, and periodicities ranging from 15 to 370 s are found with significance levels exceeding 95%. During two separate microflaring events, oscillation sites surrounding the bright point are observed to twist. We relate the twisting of the oscillation sites to the twisting of physical flux tubes, thus giving rise to reconnection phenomena. We derive an average twist velocity of 8.1 km s(-1) and detect a peak in the emitted flux between twist angles of 180 degrees and 230 degrees.

Original language	English
Pages (from-to)	971-977
Number of pages	7
Journal	Astronomy and Astrophysics
Volume	476
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20077916
Publication status	Published - Dec 2007

ASJC Scopus subject areas

Space and Planetary Science

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title = "Twisting flux tubes as a cause of micro-flaring activity",

abstract = "High-cadence optical observations of an H-alpha blue-wing bright point near solar AR NOAA 10794 are presented. The data were obtained with the Dunn Solar Telescope at the National Solar Observatory/Sacramento Peak using a newly developed camera system, the RAPID DUAL IMAGER. Wavelet analysis is undertaken to search for intensity-related oscillatory signatures, and periodicities ranging from 15 to 370 s are found with significance levels exceeding 95%. During two separate microflaring events, oscillation sites surrounding the bright point are observed to twist. We relate the twisting of the oscillation sites to the twisting of physical flux tubes, thus giving rise to reconnection phenomena. We derive an average twist velocity of 8.1 km s(-1) and detect a peak in the emitted flux between twist angles of 180 degrees and 230 degrees.",

author = "D.B. Jess and R.T.J. McAteer and M. Mathioudakis and F.P. Keenan and A. Andic and D.S. Bloomfield",

year = "2007",

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doi = "10.1051/0004-6361:20077916",

language = "English",

volume = "476",

pages = "971--977",

journal = "Astronomy and Astrophysics",

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TY - JOUR

T1 - Twisting flux tubes as a cause of micro-flaring activity

AU - Jess, D.B.

AU - McAteer, R.T.J.

AU - Mathioudakis, M.

AU - Keenan, F.P.

AU - Andic, A.

AU - Bloomfield, D.S.

PY - 2007/12

Y1 - 2007/12

N2 - High-cadence optical observations of an H-alpha blue-wing bright point near solar AR NOAA 10794 are presented. The data were obtained with the Dunn Solar Telescope at the National Solar Observatory/Sacramento Peak using a newly developed camera system, the RAPID DUAL IMAGER. Wavelet analysis is undertaken to search for intensity-related oscillatory signatures, and periodicities ranging from 15 to 370 s are found with significance levels exceeding 95%. During two separate microflaring events, oscillation sites surrounding the bright point are observed to twist. We relate the twisting of the oscillation sites to the twisting of physical flux tubes, thus giving rise to reconnection phenomena. We derive an average twist velocity of 8.1 km s(-1) and detect a peak in the emitted flux between twist angles of 180 degrees and 230 degrees.

AB - High-cadence optical observations of an H-alpha blue-wing bright point near solar AR NOAA 10794 are presented. The data were obtained with the Dunn Solar Telescope at the National Solar Observatory/Sacramento Peak using a newly developed camera system, the RAPID DUAL IMAGER. Wavelet analysis is undertaken to search for intensity-related oscillatory signatures, and periodicities ranging from 15 to 370 s are found with significance levels exceeding 95%. During two separate microflaring events, oscillation sites surrounding the bright point are observed to twist. We relate the twisting of the oscillation sites to the twisting of physical flux tubes, thus giving rise to reconnection phenomena. We derive an average twist velocity of 8.1 km s(-1) and detect a peak in the emitted flux between twist angles of 180 degrees and 230 degrees.

U2 - 10.1051/0004-6361:20077916

DO - 10.1051/0004-6361:20077916

M3 - Article

VL - 476

SP - 971

EP - 977

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 2

ER -

Twisting flux tubes as a cause of micro-flaring activity

Abstract

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