Session H8 was to discuss "Solar Subsurface Flows", and this session 
was planned to addresses the following topics:

What progress has been made in this research field and what is planned 
     for future HMI observations?
How can these HMI SSW maps be utilized?
What can they tell us about supergranular and giant-cell dynamics?
What are the connections to active regions and coronal magnetic fields?
What type of synoptic and predictive information can be obtained from 
     these maps?
What physical parameters can be deduced from the SSW data (e.g., vorticity, 
     divergence, Reynolds stresses, kinetic helicity, etc.)?
Where do you think we should concentrate our future efforts?
What problems (distinct from technique issues) need to be accomplished 
     before launch?
What code development if any needs to be performed before launch?
Should we organize special meetings or working groups for this topic?

Three speakers made their presentation in the three different fields 
of local helioseismology, including Rudi Komm for ring-diagram analysis, 
Laurent Gizon for time-distance, and Doug Braun for acoustic holography.

Rudi Komm presented recent results from attempts using small rings,
which had achieved fairly nice spatial resolution in deriving subsurface
flow fileds. Preliminary analysis over connections between flow fields
and filaments was also presented. He also talked about the statistical
study of relationship between subsurface vorticities and solar flares.
These research efforts might be the future research directions for the 
HMI data.

Laurent Gizon raised his concerns over the time-distance inference of 
subsurface flows. He suggested that current acoustic travel time 
measurements were not optimal yet, and more works needed to be done 
in this aspect. He also suggested sensitivity kernels and noise covariance
from measurements need to be improved and be incorporated into future 
time-distance inversions for flow fields.

Doug Braun reviewed some recent progress in acoustic holography analysis,
and also raised a few questions that remained to be resolved. Specifically,
He expressed his concerns over the travel time asymmetry in magnetic 
regions, and recommended active regions modelling be badly needed. 
He also suggested to fix the foreshortening and near-limb problems,
as well as the remapping from sperical coordinates. He also offered 
his insights in the future research direction in acoustic holography,
which included combining f-modes analysis into their inversions, and 
combining time-distance, ring diagram results into their modellings.

Regarding to the future working group plans, most participants agreed
that the topic of this session overlapped with the existed working 
group of LoHCo (Local Helioseismology Comparisons), and therefore 
many future discussions would be done within that group meeting.