Plume observation, 6-May-2016



I obtained this observation when I was EIS CO during the week of 30 April to 7 May. There was a large plume structure that passed fairly close to disk center around 10 UT on 6 May, and I obtained observations with Hinode and IRIS. My guess is that the plume was a remnant of an active region, although it did occur at the boundary of a not-very-well-defined coronal hole. 

The movie below shows that the plume is quite bright in AIA 193, and this is confirmed by EIS which shows bright Fe XII 195. The plume is therefore quite different to a standardcoronal hole plume.


AIA 171 (left) and 193 (right) movies at 5 minute cadence. Logarithmic intensity scaling.

EIS data-set

As EIS was already in eclipse season I didn't bother doing sit-and-stare observations with the slit. Instead I broke the observation down into 4 sections corresponding to 4 orbits:

10:32   Cool_loop_response (6 rasters)
12:13   CAM_AR0_CDS_40AS (3 repeats, 180 exposures)
13:51   CAM_AR0_CDS_40AS (3 repeats, 180 exposures)
15:46   Atlas_30

Following some of the dynamics I've been seeing in the sit-and-stare slit observations, I thought to run a 40" slot sit-and-stare. The study CAM_AR0_CDS_40AS has a good line list and only takes 200" along the slit.

Even if I say so myself, the pointing was excellent with the center of the plume right in the center of both the rasters and the slot data.

IRIS data-set

I coordinated the IRIS observation with the planner (Hans Courier) to match the EIS sequences I had:

10:29-11:54  16-step raster with 1" steps, 30s exposures, 10 rasters; SJI 1400 (x3), SJI 2832 (x1)
12:09-15:00  sit-and-stare, 30s exposures, 321 repeats; SJI 1400 only
15:12-16:18  64-step raster, 60s exposures, 1 repeat; all SJI filters

SOT data-set

Alfred de Wijn was the SOT planner and he scheduled the following sequence:

EIS Plume Observations
  2016/05/06 10:30:00 - 2016/05/06 11:00:00
  SOT pointing: (11,117) tracking at 2016/05/06 10:20:00
    SP07 (0x00db) Fast map, 123"x123", 1-side CCD

EIS Plume Observations
  2016/05/06 12:30:00 - 2016/05/06 13:00:00
  SOT pointing: (11,117) tracking at 2016/05/06 10:20:00
    SP07 (0x00db) Fast map, 123"x123", 1-side CCD

EIS Plume Observations
  2016/05/06 14:30:00 - 2016/05/06 15:00:00
  SOT pointing: (11,117) tracking at 2016/05/06 10:20:00
    SP07 (0x00db) Fast map, 123"x123", 1-side CCD

XRT data-set

Antonia Savcheva was the XRT CO and she scheduled the following:

XOB #1B2D: Disk Plume Filter-Ratio with Al/poly, thin-Be, andf
Al/mesh long/short pairs 256x512, 1064 904, with G-band (3ms/3ms
VLS=CLS), 120 cad
   05/06 10:36:06 - 05/06 16:19:54 : # EIS plume observation



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