Spectroscopic observations in the selected EUV spectral lines
The choice of spectral lines available in EIS makes it ideal for the DEM analysis of EIT waves. We would like to take advantage of this to study the plasma properties of these waves in the following spectral lines: OVI 184.12, FeVIII 185.21, FeXII 186.88, FeXI 188.23, CaXVII 192.82, FeXII 195.12, FeIX 197.86, FeXIII 202.04, FeXIII 203.82, SiX 258.37, SiX 261.04, FeXVI ,262.98, FeXXIII 263.76, FeXIV 264.78, FeXVII 269.42, FeXIV 274.20, SiVII 275.35, FeXV 284.16
We designed an EIS study mainly in a sit-and-stare observing mode to increase the possibility of picking up an EIT wave signal. Context images with the slot are requested before and after the sit-and-stare observations to enable us to align the EIS data with the other instruments.
The technical parameters of the two observing modes are: Sit-and-stare observing mode: slit: 2"x440" exposure time/delay time: 40.0s/0ms number of exposures: 26 width of spectral windows: 32 (except OVI: 56, CaXVII: 48, FeXII: 40, FeXVII: 64) number of lines: 18 number of study repetitions: 6-8 data rate: 46.628 kbps feature tracking is required
Observations for context images: slot: 40"x512" step size: 40" number of steps: 1 final FoV: 40"x512" exposure time/delay time: 45.0s/0ms width of spectral windows: 48 number of lines: 3 feature tracking is required number of study repetitions: 2 (before and after the sit-and stare mode) |
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