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Vigeesh Gangadharan
Kiepenheuer-Institut für Sonnenphysik
Position
Department
Field of research
Natural Sciences (Astrophysics and Astrononmy)
Email
vigeesh@ileibniz-kis.de
My OpenAccess portfolio
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Magneto-acoustic wave propagation in a magnetic flux sheet (moderate field)
Natural Sciences (Astrophysics and Astrononmy)
1215 views
Date of upload:
03.07.2015
Co-author:
S. S. Hasan, O. Steiner
Caption:
Temperature perturbations in a magnetic flux sheet (moderate field strength) due to waves excited by a horizontal motion at the bottom boundary. The waves higher up are predominantly acoustic (slow magneto-acoustic) that propagate up and form shock. The thin black curves are field lines and the white curve represents the contour of β=1.
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Magneto-acoustic wave propagation in a magnetic flux sheet (strong field)
Natural Sciences (Astrophysics and Astrononmy)
1460 views
Date of upload:
03.07.2015
Co-author:
S. S. Hasan, O. Steiner
Caption:
Temperature perturbations in a magnetic flux sheet (strong field) due to waves excited by a horizontal motion at the bottom boundary. The excitation generates fast magneto-acoustic wave (predominantly magnetic) along with slow magneto-acoustic wave near the centre of the flux sheet. The fast wave is refracted, but the slow wave continues to propagate up.
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Magneto-acoustic waves in magnetic flux tube
Natural Sciences (Astrophysics and Astrononmy)
1349 views
Date of upload:
05.07.2015
Co-author:
Fedun, V.; Hasan, S. S.; Erdélyi, R.
Caption:
Temperature perturbations associated with the propagation of magneto-acoustic waves in a magnetic flux tube. Two scenarios of wave excitation, viz. granular buffeting and swirly motion are studied. Buffeting by granule are likely to generate strong slow and fast magneto-acoustic waves compared to swirly motions as evident from the temperature fluctuations seen in the case of horizontal excitation.
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Polarized radiation shows signature of magneto-acoustic wave propagation (moderate field)
Natural Sciences (Astrophysics and Astrononmy)
1118 views
Date of upload:
06.07.2015
Co-author:
O. Steiner, S. S. Hasan
Caption:
Variation of Stokes-V profiles of Fe I (5250.2 Å and 6302.5 Å) emerging from a small region on either side of the magnetic flux sheet (moderate field strength) as a result of wave propagation within the line-of-sight. The emergent Stokes-V profile over the whole domain does not show any significant variation with time (not shown in the animation).

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