POSTER PAPER 1.04
Sunspot Umbral Oscillations: Results from SOHO JOP097
Eoghan O'Shea, Karin Muglach, & Bernhard Fleck
Institute: ESA Space Science Department, ESTEC
Institute: Astrophysikalisches Institut, Potsdam
Institute: ESA Space Science Department, NASA/GSFC
Contact Email: eoshea@ll.iac.es
Abstract:
We present results of an ongoing analysis of time series data,
which were obtained in the context of the Joint Observing Program
(JOP) 97 of the year 2000.
This JOP included the Coronal Diagnostic Spectrometer (CDS) and the
Michelson Doppler Imager (MDI) instrument, both part of SOHO,
the TRACE satellite and various ground based observatories.
We show evidence for apparently upwardly propagating in a sunspot umbra
which we suggest are due to magnetoacoustic waves. These waves manifest
themselves as oscillations in lines ranging in temperature from the upper
photosphere/chromosphere to the corona. To our knowledge
this is the first time umbral oscillations have been conclusively seen
in coronal lines.
This research is part of the European Solar Magnetometry
Network (ESMN) supported by the EU through the
TMR programme.
Index Keywords: Sun
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Manuscript submitted: 2001-Sep-6
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.