HOP 0149

abstract of observational proposal

Outline of Observation: During Quiet Sun (QS) conditions, this programme seeks to observe the same area at the disc centre for at least a day to i) capture flux emergence episodes, ii) observe any related changes in the solar atmosphere and iii) focus in particular on flow velocities. EIS will obtain context images of the target using a slot scan but the main observation will use a raster scan with the 2 arc sec slit and with exposure times of ~ 50s to register the He II and strong low temperature lines. QS observations near disc centre will allow measurement of any related flow velocity patterns in the upper transition region and corona. SOT would provide Ca II images for co-alignment, LOS magnetograms to track the behavior of emerging flux and its interactions and SP scans once per hour or less often to fit telemetry constraints. XRT would take images using the single filter dynamics programme to provide coronal context. The observations will help support a Flux Emergence Workshop which is planned to take place in the UK during the last week of March 2010.

Several days observation over the 2009/10 holiday period should provide an ideal data set. EIS would employ a modified version of the study madj_qs (ID # 324) to scan a field of ~ 100” X 248”.

request to SOT

The objective for SOT would be to provide information on the evolution of the magnetic field. For SOT the cadence for FG magnetograms should be approximately one magnetogram every 10-20 minutes, depending on the available telemetry. The field of view should match that of the EIS raster. Ca II images should be taken periodically for help with co-alignment. In addition a SP scan for vector field data would be most valuable at a frequency of one per hour or less as limited by available telemetry.

request to EIS

Context:
Context studies to be run at the beginning and end of each observing day
Run IUU_SLOT_136x400_Q65, Size: 136 arcsec x 400 arcsec, Duration: 16 minutes, Data volume: 1.3 Mbit

Emerging Flux Observation:
Repeat madj_qs (modified) throughout the day. FoV: 100” X 248”, Duration: 32m/raster, Data volume: ~ 450 Mbit/day
Repeat raster throughout the day. Observe when target area is within ± 4 days of central meridian.

remarks

Magnetic Flux Emergence Programme.
Run for at least one day, preferably for several days when QS conditions are available near central meridian to enable good velocity measurements
Target Region of QS at or near disc centre. Ideally observe when target area is within ± 4 days of central meridian. As far as possible track continuously each day.