HOP 0424

HINODE Operation Plan (HOP)

accepted on

22-jul-2021

HOP No.

HOP title

HOP 0424

Coordinated observation with CLASP2.1 sounding rocket

plan term

2021/10/05-2021/10/05

proposer

name :

Okamoto, Rachmeler, Ishikawa, McKenzie

e-mail :

okamoto[at]solar.isas.jaxa.jp, laurel.rachmeler[at]noaa.gov

contact person in HINODE team

name :

DeRosa, Shine

e-mail :

derosa[at]lmsal.com, shine[at]lmsal.com

abstract of observational proposal

Main Objective: Magnetic field measurement in the chromosphere.

Scientific Justification: Magnetic field and its structures in the solar atmosphere play an important role in energy transfer from the solar surface to the corona, which provide fundamental information to solve the remaining puzzle “the coronal heating problem”. Measurements of the magnetic field in the chromosphere is essential to achieve the goal. In 2015 and 2019, we performed two sounding rocket experiments, CLASP1 and CLASP2, to establish the techniques to diagnose the chromospheric magnetic field by demonstrating the maturity of the ultraviolet spectropolarimetry for future development into a satellite. Now to confirm the capability, we will have a reflight of the CLASP2 payload with a modified observing program to produce a 2D magnetic map by slit scan and discuss 3D configuration of magnetic structures with multi-layer information in several lines from the solar surface to just beneath the corona.

We are planning to have coordinated observations with Hinode, IRIS, and some ground-based telescopes. In particular, Hinode will provide magnetic field information on the photosphere, which is essential for constructing the 3D view of magnetic atmosphere. The IRIS spectroscopic observations of the Mg II lines is also useful to recognize the dynamics of the observed targets before/during/after the flight.

The CLASP2.1 launch is scheduled for October 5 of 2021, and the tentative launch window is 17:30 -18:00 UT.

We will observe a plage during our ~5min flight except for calibration at the disk center, and request coordinated observations of the plage before and after as well as during the flight. The exact coordinates and the launch time will be determined and communicated before the planning.

We outline two cases below: the specific case to be used depends on the roll angle of CLASP2.1, and whether IRIS roll operations are allowed at the time of the CLASP2.1 launch. This determination will be communicated to the Hinode and IRIS teams in advance of the launch.

request to SOT

CLASP2.1 pointing -- (xx", yy")
Case 1 [the roll angle of CLASP2.1 is larger than 40 degrees from the north direction]

-1 hour ~ launch window (roughly 1 hour) ~ +1 hour : ~3 context maps at (xx", yy") [obs A]

Case 2 [the roll angle of CLASP2.1 is smaller than 40 degrees from the north direction]

-1 hours ~ start of launch window : 1 context map at (xx", yy"+70") [obs A]
--> launch window (roughly 1 hour) : repeat high-cadence scans at (xx", yy") [obs B]
--> end of launch window ~ +1 hour : 1 context map at (xx", yy"-70") [obs A]

obs A: single scan with fast mode, 320" x 160" (2048 slit positions and 1024 pixel high), 2x2 binning, single side mode
~1 hour cadence (2 cycles (1.6 sec) at one slit position)
(Program ID : SP 0x20f or 0x107)

obs B: repeat scans with fast mode, 160" x 160" (1024 slit positions and 1024 pixel high), 2x2 binning, single side mode
~30 min cadence (2 cycles (1.6 sec) at one slit position)
(Program ID : SP 0x104)

request to XRT

Appropriate observing program for plage. E.g., Al-poly filter at less than 30 sec cadence; full (1x1) resolution; FOV 512x512 (527"x527") to cover the CLASP2.1 slitjaw FOV. AEC preferred, not required.
Requested during the launch window; optional before and after launch window.

request to EIS

- run study 554 once prior to launch window
- run study 444 once following study 544
- repeat study 529 for ~ 1 hour covering the launch window (7/8 repeats)
- run study 444 once
- run study 554 once

other participating instruments

IRIS requests:
Case that the IRIS slit can be aligned with the CLASP2.1 slit,
(IRIS roll operation is allowed or both slits are along the N-S direction)

-1 hours ~ start of launch window : 1 context map [obs C]--> launch window (roughly 1 hour) : repeat high-cadence scans [obs D]
--> end of launch window ~ +1 hour : 1 context map [obs C]

Case that the IRIS slit (N-S direction) is inclined to the CLASP2.1 slit,
(IRIS roll is not allowed and the CLASP2.1 slit is rotated)

-1 hour ~ launch window (roughly 1 hour) ~ +1 hour : repeat context maps [obs C]
obs C : OBS ID = 3620106077 (105"x175", dense raster, 320 steps, ~30 min)
obs D : OBS ID = 3683603440 (15"x175", sparse raster, 16 steps, 30 sec)

Additional instrument coordination:
DST (IBIS) GST (VIS, TiO, NIRIS)

remarks

Dates: 2021 October 5

Time window: 16:00-19:00 UT

Target(s) of interest: Active region plage

Previous HOPs: HOPs 368, 290

Additional remarks:
The slit-scan by CLASP2.1 covers a FOV of 30" x 200" (up to 17 steps with 2" spatial interval).

Total Hinode observation time is 3 hours including the launch window.