Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Validating time-distance helioseismic inversions for non-separable
  subsurface profiles of an average supergranule   Supergranules are divergent 30-Mm sized cellular flows observed everywhere at
the solar photosphere. Their place in the hierarchy of convective structures
and their origin remain poorly understood (Rincon et al., 2018). Estimating
supergranular depth is of particular interest since this may help point to the
underlying physics. However, their subsurface velocity profiles have proven
difficult to ascertain. Birch et al. (2006) had suggested that helioseismic
inferences would benefit from an ensemble average over multiple realizations of
supergranules due to the reduction in realization noise. Bhattacharya et al.
(2017) used synthetic forward-modelled seismic wave travel times and
demonstrated the potential of helioseismic inversions at recovering the flow
profile of an average supergranule that is separable in the horizontal and
vertical directions, although the premise of this calculation has since been
challenged by Ferret (2019). In this work we avoid this assumption and carry
out a validation test of helioseismic travel-time inversions starting from
plausible synthetic non-separable profiles of an average supergranule. We
compute seismic wave travel times and sensitivity kernels by simulating wave
propagation through this background. We find that, while the ability to recover
the exact profile degrades based on the number of parameters involved, we are
nevertheless able to recover the peak depth of our models in a few iterations
where the measurements are presumably above the noise cutoff. This represents
an important step towards unraveling the physics behind supergranules, as we
start appreciating the parameters that we may reliably infer from a
time-distance helioseismic inversion.

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The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ