What mechanisms allow the 5-minute oscillations in the active regions of the solar surface to penetrate from the photosphere into the chromosphere?

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1Kostyk, RI
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2015, 31(4):45-53
Start Page: Solar Physics
Language: Russian
Abstract: 

Using some results of filter (line center of Ca II λ 396.8 nm) spectral (in Ba II λ 455.4 nm) and spectropolarimetric (in Fe I λλ 1564.3—1565.8 nm) observations of an active region (isolated faculae near the solar disk center) with the German Vacuum Tower Telescope (VTT) at the Canaries Institute of Astrophysics, we investigated some properties of the propagation of five-minute oscillations from the bottom of the photosphere (h = 0 km) to the bottom of the chromosphere (h = 1600 km). Maximum oscillation power in the lower photosphere, in the transition region, and in the middle chromosphere falls at a period close to P ≈ 5 min. At the height h = 1600 km is well seen even one oscillation period P ≈ 700 sec. Penetration of 5-min oscillations from the photosphere into the chromosphere is allowed by two factors: the inclination of the magnetic field lines and the deviation of wave propagation process from adiabatic. Maximal power of 5-minute oscillations at the height h=1600 km to fit on the inclination angles of the magnetic field in the range of 11°—13° and the phase shift between the oscillations of temperature and velocity of 40—50 degrees.

Keywords: 5-minute oscillations, Sun, VTT telescope
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