HOP 0502

contact person in HINODE team

name :

General: Kobelski, Duncan (NASA/MSFC) / Watanabe (NAOJ) / De Pontieu (LMSAL), SOT -- DeRosa /D Shine (LMSAL), XRT -- Reeves/ Testa (SAO), EIS -- Matthews / Culhane (UCL/MSSL)

e-mail :

adam.kobelski[at]nasa.gov, jessie.m.duncan[at]nasa.gov, tet_watanabe[at]jcom.zaq.ne.jp, bdp[at]lmsal.com, derosa[at]lmsal.com,kreeves[at]cfa.harvard.edu, ptesta[at]cfa.harvard.edu, sarah.matthews[at]ucl.ac.uk, j.culhane[at]ucl.ac.uk

abstract of observational proposal

Main Objective: Conduct coordinated observations of equatorial coronal holes to characterize the sources of fast solar wind and compare their properties at the Sun with in situ measurements, focusing on the relationship between switchbacks and jets.

Scientific Justification: We aim to conduct coordinated observations of equatorial coronal holes to characterize the sources of fast solar wind and compare their properties at the Sun with in situ measurements. Our focus is on the relationship between switchbacks and jets, using simultaneous imaging and spectroscopic observations from EIS, XRT, and IRIS. We will measure variations in temperature, electron density, emission measure, and velocities before, during, and after jet evolution. This will help determine the physical parameters in coronal holes and find quantitative relations between coronal-hole parameters and solar-wind parameters. These observations are crucial for understanding the mechanisms behind fast solar wind formation and will be conducted in conjunction with Solar Orbiter and Parker Solar Probe encounters. The first set of observations should be run right before and simultaneous to the first instance of the SOOP and a second set of observations before the second instance of the SOOP.

request to EIS

Details: Coordinate exact details with the chief planner.
Pointing: Disk observation of a coronal hole.
Alternate between the two studies listed below.

Observation Schedule:

Dates: March 22nd to 28th and March 29th to April 4th. 2nd period is lower priority
Priority Days: March 24th to 26th (EUI high-res campaign)

Study 1: Coronal Hole Observation
Study ID: 618
Acronym: HOP81_new_study_v2
Title: New coronal hole study for polar monitoring campaign, increased exposure
Timing: March 22nd - March 28th
Run once a day or twice if telemetry permits. Should be coordinated with times when SPICE is running its composition programme approximately. Timing of SPICE composition rasters:

March 24th from 19:00 to 22:14

March 25th from 08:53 to 12:07

March 25th from 21:28 to March 26th at 00:42

March 26th from 18:45 to 21:59

March 27th from 08:49 to 12:03

Study 2: Coronal Hole Jet Observation
Study ID: 512
Acronym: Cor_Hole_Jet_v1
Title: Small, fast raster for studying coronal hole jets.
Timing:
March 24th from 22:00 to 23:00
March 25th from 18:00 to 19:00
March 26th from 22:30 to 23:30

Run as many repeats as telemetry allows during each of these time windows
Pointing: A bright point inside a coronal hole region, during EUI high-resolution observations.

Time outside the Fast Wind SOOP of 22nd to 28th, please run one of each study per day pointing at the CH connected to SolO at that time. As telemetry allows.

For second period (March 29th to April 4th), please run one of each study per day pointing at the solar wind source region predicted for April 4th to April 6th, as telemetry allows. Highest priority to April 3rd and April 4th.

EIS studies have the highest priority.
Willing to sacrifice XRT (first) and SOT (second) observations if additional telemetry is available for EIS studies.

other participating instruments

IRIS requests:
Request sent to IRIS team awaiting response IRIS requests: For on-disk/polar coronal hole, run the following IRIS study. IRIS spectrograph: OBS ID : 3620109459 | Large sparse 64-step raster 63x120 64s Si IV Mg II h/k Deep x 8 Spa | 588.93 |253.62 | 0.3 | 9.2+-0.1 | 589+-0 | 0.0+-0.0 | 18.4+-0.0 | 18.4+-0.0 | 0.0+-0.0
IRIS Slit-Jaw Imager:
Field of view: 120" X 120"
SJI window: Si IV and Mg II
Exposure time: 4 sec
SJI cadence: 18.4 sec

Additional instrument coordination:
SOOP: L_SMALL_HRES_HCAD_Fast-Wind
https://issues.cosmos.esa.int/solarorbiterwiki/display/SOSP/Solar+Orbiter+Planning+-+for+coordination+with+external+parties

remarks

Dates: Plan term 2025/03/20 - 2025/04/04. The Fast Wind SOOP will run from March 24th to 26th and April 4th to 6th (about 3 full days for each instance).
We would like to request observations to be run between March 22nd and 26th since Hinode and Solar Orbiter will have a similar view of the Sun; and between March 29th and April 4th we would like to observe the area determined by the predicted connectivity with Solar Orbiter before we are on quadrature and we loose the possibility for co-temporal observations. The observations previous to the SOOP runs will allow us to monitor and characterize possible changes in the target coronal hole.
Most important days: 24th to 26th of March, these three consecutive days are required, all other days are desired.

Time window:
Target(s) of interest: Equatorial Coronal Hole (TOO), to be determined by the predicted connectivity with Solar Orbiter.

Previous HOPs:
No HOP identical to this one has been run before.

Additional remarks:
Note that target information requires using models to map the Solar Orbiter connectivity footpoint location back to the solar surface.

Thank you for your help!