Relationship between Horizontal Flow Velocity and Cell Lifetime for Supergranulation

Details Relationship between Horizontal Flow Velocity and Cell Lifetime for Supergranulation Relationship between Horizontal Flow Velocity and Cell Lifetime for Supergranulation

2004-07-14

arxiv.org/abs/physics/0407079v1

Physics

Plasma Physics

12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)

Scientific paper

10.1111/j.1365-2966.2004.07312.x

A study of 50 supergranular cells obtained from SOHO Dopplergrams was undertaken in order to investigate the relationship between the lifetime ($T$) and the horizontal flow velocity ($v_h$) of the cells. For this sample we find that the two parameters are correlated with a relation $v_h\propto T^{0.5}$ and $T$ is identified with the eddy turn-over time. This is in agreement with the turbulent convective model of the solar atmosphere where the velocity spectrum of supergranular field given by '$v_h \propto L^{1/3}$' can be identified with the Kolmogorov spectrum for the eddy size $L$.

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