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SUMER/SOHO Observations of Long Period Oscillations in an Active Region Filament

  • S. Régnier (a1), J. Solomon (a1) and J. C. Vial (a1)

Abstract

During the MEDOC campaign #4 (October 1999), we observed an active region filament with the SUMER/SoHO spectrometer using the 584.33 Å HeI line. After a description of the HeI line profile in the filament, we present a Fourier analysis of SUMER long time observations. This analysis allows to detect oscillations in several ranges of periodicities: 6–20 min, 40–90 min. We discuss these periodicities in terms of Alfvén and magnetoacoustic waves obtained with a filament model developed by Joarder & Roberts (1993).

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References

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Chae, J., Schühle, U., Lemaire, P., 1998, ApJ, 505, 957.
Joarder, P.S., Roberts, B., 1993, A&A, 277, 225.
Molowny-Horas, R., Oliver, R., Ballester, J.L., Baudin, F., 1997, Sol. Phys., 172, 181.
Oliver, R., 1999, 9th European Meeting on Solar Physics, ESA-SP 448, p.425.
Wilhelm, K., et al., 1995, Sol. Phys., 162, 189.

SUMER/SOHO Observations of Long Period Oscillations in an Active Region Filament

  • S. Régnier (a1), J. Solomon (a1) and J. C. Vial (a1)

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