HOP 0426

HINODE Operation Plan (HOP)

accepted on

26-aug-21

HOP No.

HOP title

HOP 0426

Coordination with SST, IRIS, and Solar Orbiter PHI - Dynamics of flux cancellation in neutral lines

contact person in HINODE team

name :

Savage, Watanabe, De Pontieu

e-mail :

sabrina.savage[at]nasa.gov, watanabe.tetsuya[at]nao.ac.jp, bdp[at]lmsal.com

abstract of observational proposal

Main Objective: IRIS+SST+Solar Orbiter PHI High Resolution Campaign coordinated observations of the dynamics of flux cancellation in emerging or decaying active region neutral lines.

Scientific Justification: The investigation focuses on the physics of flux cancellation in neutral lines. Reconnection events along neutral lines form the photosphere to higher heights in the atmosphere are believed to be behind the formation of filament channels, the seeds of CMEs. A large number of cancellation events in coordination with SST (Halpha - looking for heating events such as Ellerman bombs) is needed to elucidate the physical processes behind the creation of filament channels.

request to SOT

Similar to HOP330 on 2017 April 22 at 14UT, but twice as wide (i.e. 20").
*********** SOT 330 request ***************
Fast Hinode/SP rasters with a cadence of maximum 80s. Readout along the slit should be at least 60 arcsec. FOV perpendicular to the slit should be densely covered. The program can be very similar to that of HOP 243: SP: very fast maps, to obtain the required time resolution with enough slit positions to maximize the chance of overlap with the IRIS slit. Both sides of the CCD are used to increase SNR.

Two programs have been tested so far:
SP 0x15b Very Fast Map, 9"x82", 2-side CCD, Q65, repeats: cadence = 73 sec, telemetry usage = 500 Mbits/hour
SP 0x190 HOP 243 low-TLM, Very Fast map 9x82, lower half
For a plage target observed with IRIS, use either
SP 0x0194 HOP 243 Plage, DynamicsMode 9x82, bottom half, uses ~1000 Mbits/hr
SP 0x0195 HOP 243 Plage, Lower-TLM DynMode, 9x82, bottom half, uses ~500 Mbits/hr
*****************************************************

other participating instruments

SST
IRIS requests:
specific IRIS OBS-IDs to make this HOP into an IHOP:

High data rate:
3620106831 | Very large sparse 8-step raster 7x175 8s Si IV Mg II h/k Mg II w | 41.05 |47.07 | 0.8 | 5.1+/-0.1 | 41.1+/-0.0 | 0.0+/-0.0 | 20.5+/-0.1 | 20.6+/-0.1 | 20.5+/-0.1

Low data rate:
3620106830 | Large sparse 8-step raster 7x120 8s Si IV Mg II h/k Mg II w Deep | 40.95 |29.63 | 0.5 | 5.1+/-0.1 | 41.0+/-0.0 | 0.0+/-0.0 | 20.4+/-0.1 | 20.5+/-0.1 | 20.4+/-0.1

remarks

Dates: 8-10 UT coordinated with SST. It would be nice not to have short interruptions, if possible, to maximize coordination coverage of potentially good seeing conditions at the SST

Time window: Every other day during the LMSAL shift at the SST / IRIS-SST coordination: Sep 11 to
Sep 24 2021

Target(s) of interest:
1. TOO - Neutral line of an emerging AR.
2. TOO - Neutral line of a decaying AR / opposite polarity plage

Previous HOPs:
HOP 0383 was submitted from the present proposer.

Additional remarks:
I’m not sure if I should document this in the information above so I just mention it here:
Depending on the target neutral line orientation, we may sacrifice the cadence for an additional 20" along the x-direction, doubling it to 3.2 minutes per raster if our target is promising enough.