Leakage of photospheric motions into the magnetic solar atmosphere: new prospects of magneto‐seismology

Abstract

The leakage and coupling of solar global oscillations to the overlaying magnetized solar atmosphere is investigated in this paper. Solar global acoustic oscillations may couple through resonant absorption to atmospheric local magnetic eigenoscillations (i) resulting in small shifts of the order of µHz in the real part of their frequencies as compared to their non-magnetic counterparts, and (ii) causing dissipation of wave energy and a consequent line broadening of the modes. Alternatively, global modes may also penetrate deeply into the magnetized solar atmosphere through leakage along magnetic field lines causing small-scale structuring in the transition region and low corona. By analyzing the dynamic fragmentation generated by direct wave propagations, one may deduce diagnostic information about the geometric and physical properties of the local magnetic environment in the atmosphere. A few numerical examples are presented here to demonstrate the leakage of global oscillations and its influence and omnipotence on the dynamics of the lower solar atmosphere.

On the validity of nonlinear Alfvén resonance in space plasmas

“…Recently resonant absorption has acquired a new applicability when the observed damping of waves and oscillations in coronal loops has been attributed to resonant absorption. Hence, resonant absorption has become a fundamental constituent block of one of the newest branches of solar physics, called coronal seismology (see e.g., Nakariakov et al 1999;Ruderman & Roberts 2002;Goossens et al 2002;Arregui et al 2007;Ballai et al 2008;Goossens et al 2008;Terradas et al 2008) when applied to corona and solar magneto-seismology when applied to the en-tire coupled solar atmosphere (see e.g., Erdélyi et al 2007;Verth 2007;Verth et al 2007).…”

Five-Minute Solar Oscillations and Ion-Cyclotron Waves in the Solar Wind

“…At statement of this task, we take into account the fact that the energy of the photospheric oscillations is transformed partly into the energy of Alfven waves that propagate upward and reach the solar corona. Then they are transported into the heliosphere over long distances by the solar wind (Erdélyi et al 2007;Tomczyk et al 2007;Mathioudakis et al 2013). According to Potapov et al (2012Potapov et al ( , 2013 the Alfven waves driven by the 5-minute solar oscillations are observed at the Earth's orbit.…”