Back to Search Start Over

Space – Time Distribution of G-band and Ca ii H-line Intensity Oscillations in Hinode/SOT – FG Observations.

Authors :
Lawrence, J. K.
Cadavid, A. C.
Source :
Solar Physics. Jan2010, Vol. 261 Issue 1, p35-52. 18p. 16 Graphs.
Publication Year :
2010

Abstract

We study the space – time distributions of intensity fluctuations in 2 – 3 hour sequences of multi-spectral, high-resolution, high-cadence, broad-band filtergram images of the Sun made by the SOT – FG system aboard the Hinode spacecraft. In the frequency range 5.5< f<8.0 mHz both G-band and Ca ii H-line oscillations are suppressed in the presence of magnetic fields, but the suppression disappears for f>10 mHz. By looking at G-band frequencies above 10 mHz we find that the oscillatory power, both at these frequencies and at lower frequencies, lies in a mesh pattern with cell scale 2 – 3 Mm, clearly larger than normal granulation, and with correlation times on the order of hours. The mesh pattern lies in the dark lanes between stable cells found in time-integrated G-band intensity images. It also underlies part of the bright pattern in time-integrated H-line emission. This discovery may reflect dynamical constraints on the sizes of rising granular convection cells together with the turbulence created in strong intercellular downflows. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00380938
Volume :
261
Issue :
1
Database :
Academic Search Index
Journal :
Solar Physics
Publication Type :
Academic Journal
Accession number :
47010120
Full Text :
https://doi.org/10.1007/s11207-009-9481-z