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HINODE Operation Plan (HOP)

accepted on

20-oct-2016


 HOP No.

 HOP title

HOP 0327

ALMA-Hinode-IRIS Cycle 4 observation: Energy evaluation of micro- and nano-flaring heating events in solar active regions

plan term

@ @

proposer

 name : Shimizu, Shimojo @  e-mail : shimizu[at]solar.isas.jaxa.jp, masumi.shimojo[at]nao.ac.jp

contact person in HINODE team

 name : Watanabe @  e-mail : WATANABE[at]uvlab.mtk.nao.ac.jp

 abstract of observational proposal
Main Objective: ALMA-Hinode-IRIS coordination on an active region for estimating the amount of the energy released by each of small reconnection events

Scientific Justification:
Reconnection events in nanoflare energy range are a candidate for the heating of the corona in active regions. The number distribution of reconnection events as a function of energy is essential to evaluate the importance of nanoflares in the heating. ALMA observations would provide a new capability for newly exploring the released energy of reconnection events in the energy range around 10^(23)-10^(24) ergs. Transient heating of the plasma at the upper chromosphere, caused by reconnection events, should be observed as the transient increase in brightness temperature. The time series of the ALMA measurements, coordinated with Hinode and IRIS observations, are investigated to establish a new method for estimating the amount of the energy released by each of small reconnection events. Hinode and IRIS observations provide a counterpart of the energy release behaviors in the corona as well as in the chromosphere and would be helpful in the energy estimation. Repeated series of SP maps are used to investigate the magnetic origin at the photosphere for reconnection events.

 request to SOT
Repeat SP fast maps (0.32h pixel, 3.2 sec integration, i.e., 2cycles x 2) continuously (without
pause) during the time window. Maps should be continuously recorded even during SAA periods. FOV 60 arcsec x 60 arcsec minimum.

If the telemetry is limited, an additional time interval can be given in between two SP maps.

 request to XRT
Continuous high-cadence time series of X-ray images
Al-poly+Open or similar filter
1x1 pixel, FOV 128h x 128h or 64 gx 64h
Exposure 256msec, AEC enabled
highest possible time cadence (shorter than 8 sec)
(If meaningful G-band exposures can be acquired, it would be helpful for co-alignment.)

If XRT team has any suggestions for better study, it is welcome.
- Not stopping at SAAs

 request to EIS
High cadence repeated scans during the time window.
One possible study is ID: 360 cam_artb_lite_v2
40h (slit 2h x 20 positions) scan x 120 pixels height
Exposure 10 sec

If EIS team has any suggestions for better study, it is welcome.

 other participating instruments
ALMA
IRIS:
(BdP's suggestion)
3620007150  |  Medium coarse 32-step raster 62x60 32s  C II   Si IV   Mg II h/k Deep   |     175.93    |     212.34    |       0.8     |  5.5+/-0.1 |  176+/-0   | 22.0+/-0.0 | 22.0+/-0.0 | 22.0+/-0.0 |  0.0+/-0.0
This will have a cadence of 176s and raster 62hx60h arcsec at 2h steps.  I went with 4s exposures to make sure you have enough signal. The data rate is on the high side, so we also need a lower telemetry version for days where the IRIS planner doesnft have much telemetry available. I suggest the following for a low data rate version:
3640257150  |  Medium coarse 32-step raster 62x60 32s  C II   Si IV   Mg II h/k Deep   |     162.99    |      83.31    |       0.4     |  5.1+/-0.2 |  163+/-0   | 20.4+/-0.0 | 20.4+/-0.0 | 20.4+/-0.0 |  0.0+/-0.0

 remarks
Previous HOP information:
HOP97: CORE: Nanoflaring activities in the Quiet Sun Otsuji et al. 2011 PASJ

Additional Remarks:
Accepted ALMA cycle 4 proposal
Antenna configuration C40-2
about 2 arcsec in Band 3, FOV 60 arcsec in diameter, 2 sec cadence of maps

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