IHOP 268 - transition region and coronal response to MMFs


IHOP 268 is intended to search for MMFs around sunspots that lead to strong Si IV signatures in IRIS and (sometimes) coronal signatures.

For EIS I'm using the Cor_Hole_Jet_v1 study, which doesn't have many lines.

During 15-28 October 2015, IHOP 268 was run as part of a campaign with the Dunn Solar Telescope.

Observations

5 October 2014, 01:40-06:00

1400 slitjaw movie doesn't show anything spectacular.

EIS was run between 00:06 and 05:39.

I checked the EIS sequence with raster_browser but didn't see anything interesting in He II.

iris_burst_check does not return anything.

6 October 2014, 00:07-05:02

This shows some activity, but not within the IRIS raster!

The EIS study was run in two groups: 00:06-04:00 & 04:05-05:38

EIS shows an event at 03:06 at (70,-325); seen in He II & coronal lines.

There's a flare in the SJI images at 03:06, but it's outside of the raster scan - need to check pointing from IRIS.

There are few intense 'blue' events in Si IV in the IRIS raster sequence that seem to occur under a small loop system. Note that the IRIS raster covers 45 to 80 in X, thus seems to be a bit offset from EIS.

iris_burst_check does not return anything.

18 October 2014, 12:06-13:51

IRIS: 11:59 to 13:57 (12 36-step rasters; 15s exp)
EIS: 12:06 to 13:51

There's a very nice, large sunspot here, but no intense Si IV brightenings. The data-set would be good for studying plumes, but the EIS study isn't very suitable.

iris_burst_check does not return any events.

AR 12257 (8-10 Jan 2015)

I was the CO for 8-10 January and I decided to run my HOP 268 study on AR 12257, which was showing emerging flux but not producing any significant flares. I obtained IRIS support for 9-10 January.

8 January, 18:15-20:59 (Cor_hole_jet_v1, x28)

Checking the EIS sequence with eis_raster_browser, the following brightenings are significant when I set the threshold to 5000:

19:12:43, (2,111), 11000 (raster 9) -> coronal signature
-> IRIS slitjaw shows small, complex loop brightening at this time

20:34:18, (2,110), 7000 (raster 23) -> coronal signature
-> IRIS slitjaw shows similar small, complex loop brightening but goes outside of FOV

IRIS was not specifically supporting, but it was running a flare watch at the time, and it was observing at the times of these brightenings. The slit was on the west side of the region so did not overlap with EIS, but the slitjaw did overlap.

9 January 2015, 09:20-14:30 (Cor_hole_jet_v1, x50)

No EIS brightenings at the 5000 level in He II.

9 January 2015, 18:20-05:35 (Cor_hole_jet_v1, x110)

IRIS: 01:33-02:30 (x18 36-step-rasters, 4s exp)

22:09:23, (8,110), 6500 (raster 39) -> coronal signature
-> not observed by IRIS

22:15:44, (7,71), 12000 (raster 40) -> no coronal signature
-> unusual; shows large redshift (outside of window) and very compact
-> not observed by IRIS

22:21:02, (8,93), 8500 (raster 41)
-> continues into next raster where has a loop-like shape
-> not observed by IRIS


01:46:36 (raster 76)-> multiple brightenings, flare?
-> continues for 4 rasters
-> observed by IRIS

The output from iris_burst_check is given below. Most of the events are probably flare-related, but events 25 and 26 are not.

File index   Event       Time   X-ind Y-ind  Int (DN/s)  npix
0 1 01:33:31 3 660 493.1 5
1 2 01:36:37 2 660 308.3 2
2 3 01:39:54 3 663 645.3 4
3 4 01:45:54 35 582 699.1 8
3 5 01:45:39 32 591 273.6 2
3 6 01:45:33 31 598 1341.7 14
3 7 01:43:26 7 606 256.9 1
3 8 01:43:05 3 665 340.2 3
4 9 01:46:47 9 576 359.1 4
4 10 01:46:53 10 581 793.7 11
4 11 01:47:20 15 584 320.1 3
4 12 01:46:11 2 592 2194.3 36
4 13 01:46:37 7 594 293.7 2
4 14 01:46:26 5 595 448.7 3
4 15 01:48:55 33 598 441.2 6
4 16 01:48:45 31 607 271.7 2
4 17 01:46:42 8 643 310.6 4
4 18 01:46:16 3 666 259.7 1
5 19 01:49:16 1 588 810.8 7
5 20 01:49:27 3 666 263.8 2
6 21 01:52:38 3 666 458.8 4
7 22 01:55:50 3 667 346.2 3
9 23 02:02:12 3 667 265.6 1
12 24 02:11:45 3 667 315.4 2
15 25 02:23:37 29 392 327.6 2
16 26 02:26:48 29 392 463.8 3