studies A and B will be run in succession on 4 and 5 October.
Two sepcific low-telemetry studies were designed.
A) GDZ_LT_JET_60x160
It uses the 2" slit and with 30 exposures of 20s, a step size of 2" covers an area (observed by both SW and LW) of 60"x120" in 11m 51s. It observes a large selction of lines, from the chromosphere (He II) to the transition region (O V, Si VII, Fe VIII), the average (Si X, Fe X,XI,XII,XIII,XIV), hot (Fe XV, XVI), and flaring (Ca XVII, Fe XVII, XXIII) corona. Considering that Jets are expected to have high densities, the Fe XII 186/195 and Fe XIII 196.6/202 ratios are included to measure them. Using JPEG90 compression, the total telemetry volume is 9.6 Mbits, which, for a total volume of 345 Mb allows for about 7 hours of observations.
B) GDZ_LT_JET_SLOT1
It uses the 40" slit and with 3 exposures of 25s, a step size of 35" covers an area (observed by both SW and LW) of 110"x200" in 1m 47s. It observes a large selction of lines, from the chromosphere (He II) to the transition region (O V, Si VII), the average (Si X, Fe XII,XIII), hot (Fe XV, XVI), and flaring (Fe XXIII) corona. Extraction windows are 48 pixels, to allow measurements of moderate flows at the edge of the field of view. Using JPEG75 compression, the total telemetry volume is 0.945 Mbits, which, for a total volume of 345 Mb allows for more than 10 hours of observations.
The studies should be run on alternate days.
Details for EIS study definition:
ACRONYM: GDZ_LT_JET_60x160
OBJECTIVE: Monitor with a 12m cadence an area of 60x120, to measure flows and
electron densities in X-ray jets located inside coronal holes.
TARGET : Coronal hole region
EXPOSURE TIME : 20s
RASTER : Scanning
SLIT : 2"
STEP_SIZE : 2"
FOV : 60"x160"
SPECTRAL WIND.: 16
DATA COMP. : JPEG90
RASTER DURATON: 11m 30s
DATA volume : 9.66 Mbits
LINES : He II, O V, Si VII, SiX, Ca XVII
Fe VIII X,XI,XII,XIII,XIV,XV,XVI,XVII, XXIII
POINTING: a bright point inside a coronal hole region.
INSTRUCTION TO PLANNERS: *** shift the EIS CCD extraction window by 50" north
so the EIS FOV is centred on the SOT FOV. Study must be repeated following the region for at least 6 hours. It is important to coordinate with TRACE planners so TRACE 195 A band is observed during the same period of observation.
WARNINGS: The 20s exposure will produce low signal in most lines in the coronal hole, so this study is not well suited for coronal hole studies.
ACRONYM: GDZ_LT_JET_SLOT1
OBJECTIVE: Monitor with a 1.5m cadence an area of 110x200, to measure flows and
electron densities in X-ray jets located inside coronal holes.
TARGET : Coronal hole region
EXPOSURE TIME : 25s
RASTER : Scanning
SLIT : 40"
STEP_SIZE : 35"
FOV : 110"x240"
SPECTRAL WIND.: 10
DATA COMP. : JPEG75
RASTER DURATON: 1m 25s
DATA volume : 0.945 Mbits
LINES : He II, O V, Si VII, SiX
Fe XII,XIII, XV,XVI, XXIII
POINTING: a bright point inside a coronal hole region.
INSTRUCTION TO PLANNERS: *** shift the EIS CCD extraction window by 50" north
so the EIS FOV is centred on the SOT FOV. Study must be repeated following the region for at least 6 hours. It is important to coordinate with TRACE planners so TRACE 195 A band is observed during the same period of observation. |
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