Open AccessRelationship between horizontal flow velocity and cell lifetime for supergranulation from SOHO Dopplergrams
Author(s) -
Paniveni U.,
Krishan V.,
Singh Jagdev,
Srikanth R.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07312.x
Subject(s) - physics , turbulence , observatory , solar atmosphere , convection , astrophysics , vector field , meteorology , mechanics , magnetic field , quantum mechanics
A study of 50 supergranular cells obtained from Solar and Heliospheric Observatory ( 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 ∝ T 1/2 and T is identified by the eddy turnover time. This is in agreement with the turbulent convective model of the solar atmosphere, where the velocity spectrum of the supergranular field, given by the relation v h ∝ L 1/3 , can be identified with the Kolmogorov spectrum for the eddy size L .