A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations

S. C. Tripathy, K. Jain, S. Kholikov, F. Hill, S. P. Rajaguru, P. S. Cally

Research output: Contribution to journalArticle

Abstract

We analyze data from the Helioseismic Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) instruments on board the Solar Dynamics Observatory (SDO) to characterize the spatio-temporal acoustic power distribution in active regions as a function of the height in the solar atmosphere. For this, we use Doppler velocity and continuum intensity observed using the magnetically sensitive line at 6173 Å as well as intensity at 1600 Å and 1700 Å. We focus on the power enhancements seen around AR 11330 as a function of wave frequency, magnetic field strength, field inclination and observation height. We find that acoustic halos occur above the acoustic cutoff frequency and extends up to 10 mHz in HMI Doppler and AIA 1700 Å observations. Halos are also found to be strong functions of magnetic field and their inclination angle. We further calculate and examine the spatially averaged relative phases and cross-coherence spectra and find different wave characteristics at different heights.

LanguageEnglish
Pages691-704
Number of pages14
JournalAdvances in Space Research
Volume61
Issue number2
DOIs
StatePublished - 15 Jan 2018

Keywords

  • Acoustic waves
  • Active regions
  • Helioseismology
  • Magneto-seismology

Cite this

Tripathy, S. C. ; Jain, K. ; Kholikov, S. ; Hill, F. ; Rajaguru, S. P. ; Cally, P. S./ A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations. In: Advances in Space Research. 2018 ; Vol. 61, No. 2. pp. 691-704
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abstract = "We analyze data from the Helioseismic Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) instruments on board the Solar Dynamics Observatory (SDO) to characterize the spatio-temporal acoustic power distribution in active regions as a function of the height in the solar atmosphere. For this, we use Doppler velocity and continuum intensity observed using the magnetically sensitive line at 6173 {\AA} as well as intensity at 1600 {\AA} and 1700 {\AA}. We focus on the power enhancements seen around AR 11330 as a function of wave frequency, magnetic field strength, field inclination and observation height. We find that acoustic halos occur above the acoustic cutoff frequency and extends up to 10 mHz in HMI Doppler and AIA 1700 {\AA} observations. Halos are also found to be strong functions of magnetic field and their inclination angle. We further calculate and examine the spatially averaged relative phases and cross-coherence spectra and find different wave characteristics at different heights.",
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Tripathy, SC, Jain, K, Kholikov, S, Hill, F, Rajaguru, SP & Cally, PS 2018, 'A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations' Advances in Space Research, vol 61, no. 2, pp. 691-704. DOI: 10.1016/j.asr.2017.10.033

A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations. / Tripathy, S. C.; Jain, K.; Kholikov, S.; Hill, F.; Rajaguru, S. P.; Cally, P. S.

In: Advances in Space Research, Vol. 61, No. 2, 15.01.2018, p. 691-704.

Research output: Contribution to journalArticle

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AU - Tripathy,S. C.

AU - Jain,K.

AU - Kholikov,S.

AU - Hill,F.

AU - Rajaguru,S. P.

AU - Cally,P. S.

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Tripathy SC, Jain K, Kholikov S, Hill F, Rajaguru SP, Cally PS. A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations. Advances in Space Research. 2018 Jan 15;61(2):691-704. Available from, DOI: 10.1016/j.asr.2017.10.033