IHOP 266 observations of equatorial plumes on 22-Sep-2014


Three repeats of Cool_loop_stare were performed at 18:10, 19:19 and 21:55. This observation was not coordinated with IRIS.

The target was a compact, low-latitude coronal hole to the south of an active region complex. The AIA images (see movie below) show various "clumps" of plume emission.

The EIS data show a narrow, bright band at Y=-300 that is seen at all wavelengths (even Fe XVI). The AIA 171 movie shows that this is a little bright point that is quite intense. It doesn't seem to be part of a plume and it doesn't give a jet. Helioviewer shows that the BP is caused by some minority polarity (black) within the coronal hole (white).



AIA 171 and 193 movies at 5 minute cadence, with EIS slit over-plotted. Logarithmic intensity scaling.

The image below is a screen-grab from eis_fit_viewer, showing intensity and Dopplergrams from Fe XII 195 for the 18:10 raster. The strong redshift (around 20-25 km/s) at the bright point is very striking. Could the blue-shift south of the BP be evidence of outflow?  Note that the two following rasters show the same velocity pattern.

SOT observations

SOT ran G-band, Ca II and Mg magnetograms between 18:08 and 22:08 UT. The details are:

Obs_Type
Cadence
Number of frames
Pixel size
Image size
FG Na I 5896 (I/V)
2 minutes
120
0.08"
512x512
FG, G-band
20 minutes
12
0.11"
1024x1024
FG, Ca II H
2 minutes
120
0.05"
1024x1024



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