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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0312

Magnetic field in and around explosive granules

plan term


@ @


 name : Frank, Roudier, Malherbe @  e-mail : zoe[at]lmsal.com,troudier[at]irap.omp.eu,Jean-Marie.Malherbe[at]obspm.fr

contact person in HINODE team

 name : Shine @  e-mail : shine[at]lmsal.com

 abstract of observational proposal
Main Objective:
The objective of this project is the measurement of the magnetic field around and in explosive granules at high spatial resolution.

Scientific Justification:
This type of analysis has already been conducted using data from Sunrise / Imax (J. Palacios et al. A&A 2012 537, 21) but for very short time periods (18 and 21 minutes). A combination of Hinode SP (IQUV) observations and IRIS Slit Jaw at 2832 Angst. during at least 6 hours will allow us to study the relationship between
exploding granules and the magnetic field and also their link with Trees of Fragmenting Granules (TFGs). Such a sequence will give us access to many successive explosions which is important for understanding the number of explosions necessary to concentrate the magnetic field at the edges of these explosive granules. These explosive granules are the most dynamic elements of the solar photosphere and contribute to their development through the formation of a hTree of Fragmenting Granules" (granules families) whose actions are related to magnetic network formation in the quiet sun (Roudier et al. A&A April 2016; DOI: 10.1051/0004-6361/201628111, http://arxiv.org/pdf/1604.04118v1.pdf).

 request to SOT
SP: 3.2 arcsec x 122 arcsec mapped in 100sec Stokes parameters IQUV

 request to XRT

 request to EIS

 other participating instruments
IRIS Requests:
1. High data rate:
3600256836 | Large dense 16-step raster 5hx120h with Si IV (1400) Mg II h/k
(2796) Mg II w (2832) slit-jaw images. This has a raster cadence of 86 seconds
and rasters a similar region as SP. The field-of-view of the slit-jaw images is
120hx120h. The cadence is 21.6 seconds for each flavour of the slit-jaw channels.
This will also give chromospheric (2796) and TR (1400) coverage.

2. Low data rate:
3600256835 | Medium dense 16-step raster 5x60 16s Si IV Mg II h/k Mg II w Deep
This is the same as no. 1 except that the FOV is 5hx60h for the raster and 60hx60hfor the slit-jaw images.

Request IRIS roll to increase probability of overlapping SOT SP field of view.

Previous HOP information:
HOP 295 (2015)
Recent resulting publications:
Roudier, T., Malherbe, J.~M., Rieutord, M., Frank, Z.: 2016, gRelation between
trees of fragmenting granules and supergranulation evolutionh, accepted in
Astronomy and Astrophysics (April).
Malherbe, J.-M., Roudier, T., Frank, Z., and Rieutord, M.: 2015, "Families of
Granules, Flows, and Acoustic Events in the Solar Atmosphere from Hinode
Observations," Solar Physics 290, 321

Additional information: A similar program run over a 24 hour period and in 6 hour
slots on a latitude/longitude grid would be a useful extension of this proposal or future HOP requests for consideration.

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