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Space – Time Distribution of G-band and Ca ii H-line Intensity Oscillations in Hinode/SOT – FG Observations.
- 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]
- Subjects :
- *SUN
*OSCILLATIONS
*FLUCTUATIONS (Physics)
*SOLAR magnetic fields
*MAGNETIC fields
Subjects
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