Sunspot Umbral Oscillations: Results from SOHO JOP097

Details Sunspot Umbral Oscillations: Results from SOHO JOP097 Sunspot Umbral Oscillations: Results from SOHO JOP097

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..601o&link_type=abstract

The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (2001 July 30 - August

Astronomy and Astrophysics

Astrophysics

2

Sun

Scientific paper

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.

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