HOP 0429

abstract of observational proposal

Main Objective: Plasma and magnetic diagnostics of the tiniest EUV brightening detected by SOLO/EUI

Scientific Justification: During his first passage at 0.5 AU, SOLO/EUI HRIEUV (174 band) has detected the tiniest EUV dynamic events ever observed. They can last less than a minute and can be small as the instrument spatial resolution (400 km by now). Further observations have shown that they are everywhere. The goal of this joint program is to collect a complete set of data to allow assessing if they contribute to the heating of the solar corona, as suggested by the nanoflares idea. This includes deriving density, temperature and dynamical properties. We also need to link them to the underlying cooler atmosphere to infer the physical mechanisms at their origin. Observing AR, QS and CH, we what to understand if their properties change among environments and magnetic field properties. The first run of this program is March 2022 during SOLO alignment with Earth. This program is in coordination with the 'nanoflares SOOP' of Solar Orbiter.

request to SOT

- March 6 17:20 UT: series of repeating normal maps 20”x164”, dual side mode, seven repetitions would be good, nine repetitions are the maximum necessary, if nine repetitions are feasible by telemetry we would like to start already at 17:10 UT, Q75 [for one map with 20”x164”~ 144 Mbits -> 144*2*7 = 2016 Mbits, 144*2*9 = 2592 Mbits], each scan is expected to take about 10 minutes to complete [pointing: Polar limb, PHI 70min]
- March 7 01:10 UT: series of repeating normal maps 20”x164”, one side mode nine repetitions would be good, eleven repetitions are the maximum necessary, if eleven repetitions are feasible by telemetry we would like to start already at 01:00 UT, Q75 [144*9 = 1296 Mbits, 144*11 = 1584 Mbits], each scan is expected to take about 10 minutes to complete [pointing: AR, PHI 90min]
- March 8 00:40 UT: series of repeating normal maps 20”x164”, dual side mode, with as many repeats as telemetry allows up to a maximum of twelve maps, Q75 [max: 144*2*12 = 3456 Mbits], each scan is expected to take about 10 minutes to complete [pointing: QS, PHI 120min]

We are aware that we are asking for a large data volume for March 6-8. In case that this runs against the telemetry limit, we prefer a reduced number of repetitions individually for each day (despite the numbers given above) while starting at the first time given (in agreement with PHI observing times) and keeping the modes (dual side on March 6 and March 8, one side on March 7).

- March 17 00:18 UT: series of repeating normal maps 20”x164”, dual side mode,three repetitions would be good, five repetitions are the maximum necessary, if five repetitions are feasible by telemetry we would like to start already at 00:08 UT, Q75 [-> 144*2*3 = 864 Mbits, 144*2*5 = 1440 Mbits], each scan is expectedto take about 10 minutes to complete [pointing: QS, PHI 30min]
- March 17 03:18 UT: series of repeating normal maps 20”x164”, dual side mode,02/02/2022 09:48:14 three repetitions would be good, five repetitions are the maximum necessary, if five repetitions are feasible by telemetry we would like to start already at 03:08 UT, Q75 [-> 144*2*3 = 864 Mbits, 144*2*5 = 1440 Mbits], each scan is expected to take about 10 minutes to complete [pointing: AR, PHI 30min].

request to XRT

CH or QS observations:
Thin-be - 16 sec exposure, Al/poly+ti/poly - 5.6 sec exposure, 384''x384'’ FOV

AR Observations
Thin Be and Al-poly, AEC enabled, 384''x384'’ FOV

Ideal configuration:
During SPICE context raster: 1 or 2 sequence of the two filters.
During EUI high cadence: two filters in sequence at 30s cadence
During SPICE high cadence without EUI high cadence: sequence of the 2 filters at =>30s cadence depending on the TM. This has no priority. If the TM is too demanding, eliminate the thin-Be outside the EUI high cadence.

request to EIS

CH observations:

- 6 March 16:50 - 17:30 Atlas_30 (context raster)

- 6 March 17.30 - 18:30 ID 562 BP_response1_raster
- 6 March 18:30 - 19.05 Atlas_30
- 6 March 19:05 -21:20 cam_qs_40as_slot (ID 163) - as telemetry allows, but please run with JPEG85 compression
- 6 March 21:20 - 22:00 Atlas_30

AR observations:

- 6 March 21:50 - 22:30 Atlas_30
- 6 March 22:30 - 23:30 - either ID 602 EL_DHB_raster1 or ID 348 madj_ar (high cadence for SPICE)
- 6 March 23:30 - 7 March 00:05 (max) Atlas_30
- 7 March 00:05 - 02:35 either ID 602 EL_DHB_raster1 or ID 348 madj_ar (high cadence for SPICE and EUI)
- 7 March 02:35 - 03:05 8 March: Atlas_30.

Please prioritise the second period of high cadence observations (7 March 00:25 - 00:35) when EUI will run and coordinate with IRIS.

QS observations:

- 7 March 23:50 - 8 March 00:20 Atlas_30
- 8 March 00:20 - 02:40 ID 602 EL_DHB_raster1
- 8 March 02:40 - 03:15 Atlas_30

other participating instruments

IRIS requests:
- Coronal hole and QS:
When SPICE is performing a context raster:
3600109475 | Very large dense 256-step raster 84.2x175 256s Si IV Mg II h/k Deep | 2368.51 | 1981.02 | 0.57 | 9.3+/-0.1 | 2369+/-0 | 0.0+/-0.0 | 18.5+/-0.0 | 18.5+/-0.0 | 0.0+/-0.0

When SPICE and EIS are performing a high-cadence program:
3600107421 | Very large sparse 4-step raster 3x175 4s Si IV Mg II h/k Deep x 4 S | 20.77 | 30.95 | 1.01 | 5.2+/-0.1 | 20.8+/-0.1 | 0.0+/-0.0 | 10.4+/-0.1 | 10.3+/-0.1 | 0.0+/-0.0

- AR:
When SPICE is performing a context raster:
3600105478 | Very large dense 400-step raster 131.7x175 400s Si IV Mg II h/k Dee | 1267.00 |2672.95 | 1.43 | 3.2+/-0.1 | 1267+/-0 | 0.0+/-0.0 | 12.7+/-0.0 | 12.7+/-0.0 | 0.0+/-0.0
FOV is 132x175” with 2s exposures and 2x2 summing and cadence of 20 min.

When SPICE and EIS are performing a high-cadence program:
3620257421 | Very large sparse 4-step raster 3x175 4s Si IV Mg II h/k Deep x 4 | 21.61 | 78.47 | 2.47 | 5.4+/-0.1 | 21.7+/-0.1 | 0.0+/-0.0 | 10.8+/-0.1 | 10.8+/-0.1 | 0.0+/-
Same as for QS/CH but no summing, so higher spatial resolution.

If there are TM limitations, reduce the duration of the high cadence program only when SPICE runs the high cadence alone.

Additional instrument coordination: SDO

remarks

Dates: Alignment SOLO - Earth
1. 6 March 2022. 16:45 - 21:45 UT - Polar limb
SOLO position 2022-03-06T16:45:00: longitude separation = - 1.141 deg, latitude separation = +2.967 deg.

2. 6 March 2022. 21:50 - 7 March 06:55 - AR.
SOLO position 2022-03-06T21:50:00: longitude separation = - 0.777 deg, latitude separation = +2.962 deg

3. 8 March 2022. 00:00 - 03:00 UT - QS
SOLO position 2022-03-08T00:00:00: longitude separation = + 1.197 deg, latitude separation = +2.929 deg. Quadrature with SOLO. Hinode points at the west limb

4. 17 March 2022. 00:00 - 03:00 UT
SOLO position 2022-03-17T00:00:00: longitude separation = +25.905 deg, latitude separation = +2.049 deg.02/02/2022 09:48:14

5. 17 March 2022. 03:00 - 06:00. Target of opportunity - AR. TBD if visible by Hinode SOLO position 2022-03-17T03:00:00: longitude separation = +26.380 deg, latitude separation = +2.026 deg.

6. 30 March 2022. 00:00 - 03:00 UT. Target of opportunity - AR. TBD if visible by Hinode. SOLO position 2022-03-30T00:00:00: longitude separation = +91.876 deg, latitude separation = -1.772 deg.

Time window: Time window will be split into several observations from March 6, 2022 to March 30, 2022

Target(s) of interest: For the CH pointing, we are interested to optimize the observations for the disk and limb areas. During quadrature - limb observations, the programs should be optimized for on-disk observations.

Previous HOPs: N/A

Additional remarks:
Remember to take into account of the difference in timing of the observations because of the finite light speed. In March 6-7 Orbiter will be at about 0.5 AU. March 17 -31 it will be at 0.32 AU.
Try to support also the extended period of observation of SPICE outside the EUI and PHI high cadence times.