Vertical prominence oscillations and stability. A comparison of the influence of the distant photosphere in Inverse Polarity and Normal Polarity prominence models.

Details Vertical prominence oscillations and stability. A comparison of the influence of the distant photosphere in Inverse Polarity and Normal Polarity prominence models. Vertical prominence oscillations and stability. A comparison of the influence of the distant photosphere in Inverse Polarity and Normal Polarity prominence models.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..352s&link_type=abstract

Astronomy and Astrophysics, v.325, p.352-359

Astronomy and Astrophysics

Astrophysics

12

Sun: Prominences, Sun: Oscillations, Magnetic Fields, Waves

Scientific paper

All MHD models for prominence equilibrium to date can, in essence, be reduced to two simple current models that describe so-called Inverse (IP) and Normal (NP) Polarity topologies. Using these simple current models, I investigate the influence of the boundary condition provided by the distant photosphere (flux conservation) on vertical prominence oscillations. The fact that the photosphere is some distance z away from the prominence, implies that the Lorentz force acting on the prominence, due to the photospheric boundary condition, evolves with a delay z/v_A_ (v_A_: coronal Alfvenspeed). In an earlier paper (Schutgens 1997A&A...323..969S), it was shown that, in the case of a Kuperus-Raadu (IP) prominence, this delay can greatly influence the vertical stability properties of prominences, especially when ωτ_0_>1 (ω: frequency of oscillation, τ_0_=2z/v_A_). In this paper a comparative study is made of this effect in IP and NP prominences. Because of a different force balance, NP and IP prominences have currents and oscillation periods of different magnitude. The influence of the distant photosphere on NP prominences is minimal, while it has a very pronounced effect on IP prominences. As a result, NP and IP prominences have widely different stability properties. Foot point shaking due to photospheric 5min. oscillations will only excite IP prominences.

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