Observations and Theory of Longitudinal Waves in Coronal Loops

I. De Moortel; A. W. Hood; B. De Pontieu

Observations and Theory of Longitudinal Waves in Coronal Loops

I. De Moortel, A. W. Hood, B. De Pontieu

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

Abstract

High cadence TRACE observations show that outward propagating intensity disturbances are a common feature in large, quiescent coronal loops, close to active regions. An overview is given of measured parameters of such longitudinal oscillations in coronal loops. The observed oscillations are interpreted as propagating slow magnetoacoustic waves and are unlikely to be flare-driven. A basic magnetic field extrapolation is used to estimate the local geometry of the magnetic field. A theoretical model of slow magneto-acoustic waves, incorporating the effects of gravitational stratification, the magnetic field geometry, thermal conduction and compressive viscosity is presented to explain the very short observed damping lengths. The results of these numerical simulations are compared with the TRACE observations. Preliminary results indicate that the magnetic field geometry plays an important role.

Original language	English
Pages (from-to)	427
Journal	Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H. Lacoste
Volume	547
Publication status	Published - 1 Jan 2004

Keywords

Sun
Corona
Oscillations

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http://adsabs.harvard.edu/abs/2004ESASP.547..427D

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De Moortel, I., Hood, A. W., & De Pontieu, B. (2004). Observations and Theory of Longitudinal Waves in Coronal Loops. Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H. Lacoste, 547, 427. http://adsabs.harvard.edu/abs/2004ESASP.547..427D

De Moortel, I. ; Hood, A. W. ; De Pontieu, B. / Observations and Theory of Longitudinal Waves in Coronal Loops. In: Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H. Lacoste. 2004 ; Vol. 547. pp. 427.

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title = "Observations and Theory of Longitudinal Waves in Coronal Loops",

abstract = "High cadence TRACE observations show that outward propagating intensity disturbances are a common feature in large, quiescent coronal loops, close to active regions. An overview is given of measured parameters of such longitudinal oscillations in coronal loops. The observed oscillations are interpreted as propagating slow magnetoacoustic waves and are unlikely to be flare-driven. A basic magnetic field extrapolation is used to estimate the local geometry of the magnetic field. A theoretical model of slow magneto-acoustic waves, incorporating the effects of gravitational stratification, the magnetic field geometry, thermal conduction and compressive viscosity is presented to explain the very short observed damping lengths. The results of these numerical simulations are compared with the TRACE observations. Preliminary results indicate that the magnetic field geometry plays an important role.",

keywords = "Sun, Corona, Oscillations",

author = "{De Moortel}, I. and Hood, {A. W.} and {De Pontieu}, B.",

year = "2004",

month = jan,

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language = "English",

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pages = "427",

journal = "Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H. Lacoste",

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De Moortel, I , Hood, AW & De Pontieu, B 2004, 'Observations and Theory of Longitudinal Waves in Coronal Loops', Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H. Lacoste, vol. 547, pp. 427. <http://adsabs.harvard.edu/abs/2004ESASP.547..427D>

Observations and Theory of Longitudinal Waves in Coronal Loops. / De Moortel, I.; Hood, A. W.; De Pontieu, B.
In: Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H. Lacoste, Vol. 547, 01.01.2004, p. 427.

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

TY - JOUR

T1 - Observations and Theory of Longitudinal Waves in Coronal Loops

AU - De Moortel, I.

AU - Hood, A. W.

AU - De Pontieu, B.

PY - 2004/1/1

Y1 - 2004/1/1

N2 - High cadence TRACE observations show that outward propagating intensity disturbances are a common feature in large, quiescent coronal loops, close to active regions. An overview is given of measured parameters of such longitudinal oscillations in coronal loops. The observed oscillations are interpreted as propagating slow magnetoacoustic waves and are unlikely to be flare-driven. A basic magnetic field extrapolation is used to estimate the local geometry of the magnetic field. A theoretical model of slow magneto-acoustic waves, incorporating the effects of gravitational stratification, the magnetic field geometry, thermal conduction and compressive viscosity is presented to explain the very short observed damping lengths. The results of these numerical simulations are compared with the TRACE observations. Preliminary results indicate that the magnetic field geometry plays an important role.

AB - High cadence TRACE observations show that outward propagating intensity disturbances are a common feature in large, quiescent coronal loops, close to active regions. An overview is given of measured parameters of such longitudinal oscillations in coronal loops. The observed oscillations are interpreted as propagating slow magnetoacoustic waves and are unlikely to be flare-driven. A basic magnetic field extrapolation is used to estimate the local geometry of the magnetic field. A theoretical model of slow magneto-acoustic waves, incorporating the effects of gravitational stratification, the magnetic field geometry, thermal conduction and compressive viscosity is presented to explain the very short observed damping lengths. The results of these numerical simulations are compared with the TRACE observations. Preliminary results indicate that the magnetic field geometry plays an important role.

KW - Sun

KW - Corona

KW - Oscillations

M3 - Article

VL - 547

SP - 427

JO - Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H

JF - Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H

ER -

De Moortel I , Hood AW, De Pontieu B. Observations and Theory of Longitudinal Waves in Coronal Loops. Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE'. 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain (ESA SP-547, January 2004). Compiled by: H. Lacoste. 2004 Jan 1;547:427.

Observations and Theory of Longitudinal Waves in Coronal Loops

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Keywords

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