Eclipse observations of high-frequency oscillations in active region coronal loops

A. C. Katsiyannis; D. R. Williams; R. T.J. McAteer; P. T. Gallagher; F. P. Keenan; F. Murtagh

doi:10.1051/0004-6361:20030458

Eclipse observations of high-frequency oscillations in active region coronal loops

A. C. Katsiyannis, D. R. Williams, R. T.J. McAteer, P. T. Gallagher, F. P. Keenan, F. Murtagh

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

68 Citations (Scopus)

Abstract

One of the mechanisms proposed for heating the corona above solar active regions is the damping of magnetohydrodynamic (MHD) waves. Continuing on previous work, we provide observational evidence for the existence of high-frequency MHD waves in coronal loops observed during the August 1999 total solar eclipse. A wavelet analysis is used to identify twenty 4×4 arcsec² areas showing intensity oscillations. All detections lie in the frequency range 0.15-0.25 Hz (7-4 s), last for at least 3 periods at a confidence level of more than 99% and arise just outside known coronal loops. This leads us to suggest that they occur in low emission-measure or different temperature loops associated with the active region.

Original language	English
Pages (from-to)	709-714
Number of pages	6
Journal	Astronomy and Astrophysics
Volume	406
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20030458
Publication status	Published - 1 Aug 2003
Externally published	Yes

Access to Document

10.1051/0004-6361:20030458Licence: CC BY

Cite this

@article{8529136bc3b8485eaa16eb69e0d3b584,

title = "Eclipse observations of high-frequency oscillations in active region coronal loops",

abstract = "One of the mechanisms proposed for heating the corona above solar active regions is the damping of magnetohydrodynamic (MHD) waves. Continuing on previous work, we provide observational evidence for the existence of high-frequency MHD waves in coronal loops observed during the August 1999 total solar eclipse. A wavelet analysis is used to identify twenty 4×4 arcsec2 areas showing intensity oscillations. All detections lie in the frequency range 0.15-0.25 Hz (7-4 s), last for at least 3 periods at a confidence level of more than 99% and arise just outside known coronal loops. This leads us to suggest that they occur in low emission-measure or different temperature loops associated with the active region.",

keywords = "Eclipses, MHD, Sun: activity, Sun: corona, Sun: oscillations, Waves",

author = "Katsiyannis, {A. C.} and Williams, {D. R.} and McAteer, {R. T.J.} and Gallagher, {P. T.} and Keenan, {F. P.} and F. Murtagh",

year = "2003",

month = aug,

day = "1",

doi = "10.1051/0004-6361:20030458",

language = "English",

volume = "406",

pages = "709--714",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "2",

}

TY - JOUR

T1 - Eclipse observations of high-frequency oscillations in active region coronal loops

AU - Katsiyannis, A. C.

AU - Williams, D. R.

AU - McAteer, R. T.J.

AU - Gallagher, P. T.

AU - Keenan, F. P.

AU - Murtagh, F.

PY - 2003/8/1

Y1 - 2003/8/1

N2 - One of the mechanisms proposed for heating the corona above solar active regions is the damping of magnetohydrodynamic (MHD) waves. Continuing on previous work, we provide observational evidence for the existence of high-frequency MHD waves in coronal loops observed during the August 1999 total solar eclipse. A wavelet analysis is used to identify twenty 4×4 arcsec2 areas showing intensity oscillations. All detections lie in the frequency range 0.15-0.25 Hz (7-4 s), last for at least 3 periods at a confidence level of more than 99% and arise just outside known coronal loops. This leads us to suggest that they occur in low emission-measure or different temperature loops associated with the active region.

AB - One of the mechanisms proposed for heating the corona above solar active regions is the damping of magnetohydrodynamic (MHD) waves. Continuing on previous work, we provide observational evidence for the existence of high-frequency MHD waves in coronal loops observed during the August 1999 total solar eclipse. A wavelet analysis is used to identify twenty 4×4 arcsec2 areas showing intensity oscillations. All detections lie in the frequency range 0.15-0.25 Hz (7-4 s), last for at least 3 periods at a confidence level of more than 99% and arise just outside known coronal loops. This leads us to suggest that they occur in low emission-measure or different temperature loops associated with the active region.

KW - Eclipses

KW - MHD

KW - Sun: activity

KW - Sun: corona

KW - Sun: oscillations

KW - Waves

UR - http://www.scopus.com/inward/record.url?scp=0042705329&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:20030458

DO - 10.1051/0004-6361:20030458

M3 - Article

AN - SCOPUS:0042705329

VL - 406

SP - 709

EP - 714

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 2

ER -

Eclipse observations of high-frequency oscillations in active region coronal loops

Abstract

Access to Document

Other files and links

Fingerprint

Cite this