SOHO Joint Operations Programme 88 ================================== CDS/TRACE - 18th May 1998 ------------------------- Bright Point Diagnostics ------------------------ H.E. Mason, C.D. Pike & C.J. Schrijver Bright points in the quiet Sun, characterised by high temperature emission (from FeXVI, 2 x 10^6K), have been studied using CDS observations (Pike and Mason, 1998). CDS provides the opportunity to relate features in the transition region with those at higher temperatures (X-ray bright points). TRACE will also have this capablility. However, CDS can be used to provide a finer definition for the temperature distribution together with an estimate of the electron density. This information relates to the nature of the energy release. The CDS observations would complement the high cadence images from TRACE, by providing simultaneous data in a number of spectral diagnostic lines formed at different temperatures through from 10^5 to 3 x 10^6 K. In this JOP, TRACE will scan a bright point in a number of different filters over an area of around 4 x 4 arcmin^2. For CDS the principal requirement is to scan a smaller portion of this region (around 1x1 arcmins) in a number of lines, with the aim of relating transition region behaviour to coronal behaviour. If possible, the CDS pointing should be fine tuned in real time, to allow small spatial rasters with good cadence. CDS 1) Context raster (RT_MON, 4'x 4', 42 mins) 2) Repeats of (RT_HBP, 1' x 1', 10 mins each) DURATION: 4-5 hours TRACE Contact: Karel Schrijver Suggested sequence: CJS.tracking.1x1.all1 - takes all wavebands at 4 1/2 min cadence, duration 6 hours, full fov