Relation between Trees of Fragmenting Granules (TFG) and
supergranulation evolution from Hinode observation
Th. Roudier, J.M. Malherbe, M. Rieutord, Z. Frank
Hinode is a Japanese mission developed and launched by ISAS/JAXA,
with NAOJ as domestic partner and NASA and STFC (UK) as international partners.
It is operated by these agencies in co-operation with ESA and NSC (Norway).
HINODE 24 H sequence, 29-30 AUGUST 2007, SOT BFI (Blue continuum and Gband), SOT NFI (STOKES IV FeI 6302), pixel size 0.11 arc sec, time step 50.2 s, disk centre
Aims: we investigate the structure and evolution of interior cells of solar supergranulation. From Hinode observations, we explore the
motions on solar surface at high spatial and temporal resolution. We derive the main organization of the flows inside supergranules
and their effect on the magnetic elements.
Methods: to probe the superganule interior cell, we used the TFG evolution and their relations to horizontal flows.
Results: evolution of TFG and their mutual interactions result in cumulative effects able to build horizontal coherent flows with
longer lifetime than granulation (1 to 2 hours) over a scale up to 12". These flows clearly act on the diffusion of the intranetwork
magnetic elements and also on the location and shape of the network.
Conclusions: from our analysis during 24 hours, TFG appear as one of the major elements of the supergranules which diffuse and
advect the magnetic field on the Sunís surface. The strongest supergranules contribute the most to magnetic flux diffusion in the solar
On line supplement material: movies (Mpeg 4 format)
The FOV (60" x 62") is centered on the well formed superganule
with a quasi closed magnetic network at the boundaries.
The time step is 50 s between each frame and the duration is 24
hours (1716 frames). The pixel size is 0.16".
Movie 1 : Evolution of the magnetic field.
Movie 2 : Evolution of the TFG with various colors; the longitudinal
magnetic field is superimposed (yellow and white).
Movie 3 : Evolution of corks (indicated by crosses) relatively
to the TFG (various colors); the longitudinal magnetic field is
superimposed (yellow and blue).
Movie 4 : Evolution of corks (indicated by crosses) relatively
to the intranework (IN) and network (NE) longitudinal magnetic
field (yellow and blue).
Movie 5 : Evolution of horizontal velocity magnitudes
(Vh mag, grey levels) and the longitudinal magnetic field (red
Movie 6 : Evolution of horizontal velocity magnitudes
Vh mag, divergence of horizontal velocities (positive for divergent
in red, negative for convergent in blue) together with magnetic
fields (yellow and white contours).
Movie 7 : Evolution of the positive divergence (in red) relatively
to the families (TFG in various colors) and magnetic fields
(yellow and blue).
Movie 8 : Evolution of the positive divergence (in blue) relatively
to the families (TFG in various colors), magnetic field
magnitude (white contours) and horizontal velocity magnitudes
Vh mag (grey levels).
Movie 9 : Evolution of the families (TFG in various colors),
horizontal velocity magnitudes Vh mag (white) and magnetic
fields (yellow and blue contours).
Movie 10 : Evolution of the families (TFG in various colors)
and horizontal velocity magnitudes Vh mag (white).
Copyright © 2016 par Roudier et al, HINODE SOT/NFI/BFI data, JAXA/NASA
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