Table 1.
Detailed information of the IRIS raster scans and supersonic downflows.
| Spectrograph raster scans over AR 12740 |
Supersonic downflows above the sunspot |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Raster number | Date/time | Center | FOV | Steps | Step cadence | Exposure time | Region A | Region B | ||||
| (#) | (UT) | (″) | (″) | (s) | (s) | Detection? | Duration | log(ne) | Detection? | Duration | log(ne) | |
| (s) | (cm−3) | (s) | (cm−3) | |||||||||
| 1 | 07/23:00:50–08/01:53:40 | −459, 213 | 112 × 175 | 320 × 0.35″ | 16.2 | 14.9 | Yes | 23:48:06–23:52:41 |  |
No | –:–:– | − |
| 2 | 07/23:00:50–08/01:53:40 | −459, 213 | 112 × 175 | 320 × 0.35″ | 16.2 | 14.9 | Yes | 01:08:02–01:19:06 |  |
No | –:–:– | − |
| 3 | 08/02:01:58–08/03:28:23 | −430, 214 | 112 × 175 | 320 × 0.35″ | 16.2 | 14.9 | Yes | 02:43:17–02:50:02 |  |
Yes | 02:51:56–02:54:38 | − |
| 4 | 08/05:09:50–08/06:36:15 | −421, 196 | 112 × 175 | 320 × 0.35″ | 16.2 | 14.9 | No | –:–:– | − | Yes | 06:12:45–06:18:42 |  |
| 5 | 08/16:29:36–08/19:30:50 | −306, 188 | 3 × 119 | 4 × 1″ | 8.8 | 7.9 | Yes | 18:55:12–19:30:33 |  |
No obs | –:–:– | − |
Notes. The observation dates are 2019 May 7–8. In Cols. 9 and 12, the durations are the time periods when the SSDs were detected in regions A and B during the raster scans, respectively. The symbol “–:–:–” means that no SSDs were detected as the slit scanned this region. The symbol “−” means that no SSDs were detected as the slit scanned this region or the O IV 1400/1401 Å line pair are too weak for density diagnostics.
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