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The height dependence of temperature - velocity correlation in the solar photosphere  

Julius Koza   Submitted: 2007-04-10 02:18

We derive correlation coefficients between temperature and line-of-sight velocity as a function of optical depth throughout the solar photosphere for the non-magnetic photosphere and a small area of enhanced magnetic activity. The maximum anticorrelation of about -0.6 between temperature and line-of-sight velocity in the non-magnetic photosphere occurs at log tau5 = -0.4. The magnetic field is another decorrelating factor along with 5-min oscillations and seeing.

Authors: J. Koza, A. Kucera, J. Rybak, H. Wohl
Projects: None

Publication Status: In press: Modern Solar Facilities - Advanced Solar Science (Gottingen), Universitatsverlag Gottingen, 139 (2007)
Last Modified: 2007-04-10 09:04
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Temporal Variations in Fibril Orientation  

Julius Koza   Submitted: 2007-04-09 11:43

We measure variations in orientation of fourteen dynamic fibrils as a function of time in a small isolated plage and nearby network using a 10-min time sequence of Hα filtergrams obtained by the Dutch Open Telescope. We found motions with average angular velocities of the order of 1 deg/min suggesting systematic turning from one limit position to another, particularly apparent in the case of fibrils with lifetimes of a few minutes. Shorter fibrils tend to turn faster than longer ones, which we interpret as due to vortex flows in the underlying granulation that twist magnetic fields.

Authors: Koza, J., Sutterlin, P., Kucera, A. and Rybak, J.
Projects: Dutch Open Telescope

Publication Status: In press, "Physics of Chromospheric Plasmas" (Coimbra), ASP 368, 115 (2007)
Last Modified: 2007-04-09 12:16
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The height dependence of temperature - velocity correlation in the solar photosphere
Temporal Variations in Fibril Orientation

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