Active Region Oscillations as Observed by CDS, EIT and TRACE

We will present observational evidence of loop oscillations in an active region on the limb as seen by CDS on SOHO. The observations used in this work were obtained as part of the JOP 165 program run in September 2003. This JOP combined CDS, MDI, TRACE, SPIRIT/CORONAS-F and EIT to obtain spectral and spatial data at a range of temperatures, from the photosphere to the transition region/corona. For these observations EIT was operated in its shutterless mode in order to achieve high cadence. The results shown here in this short paper are preliminary results, mainly from the CDS instrument, showing a sample dataset from the large JOP 165 observing campaign. From the single location in the active region examined we find oscillation frequencies for intensity and velocity to be in the approximate range 2-3 mHz. We calculate phase velocities of the order of 28-42 km s-1for the waves producing the oscillations. Based on these rather low phase speeds we suggest that these waves are slow mode magnetoacoustic waves.status: publishe