Observation of the period ratio P1/P2 of transversal oscillations in solar macro-spicules

@article{Ebadi2014ObservationOT,
  title={Observation of the period ratio P1/P2 of transversal oscillations in solar macro-spicules},
  author={Hossein Ebadi and Mina Khoshrangbaf},
  journal={Astrophysics and Space Science},
  year={2014},
  volume={352},
  pages={353-359}
}
We analyze the time series of oxygen line profiles (Ovi 1031.93 Å and Ovi 1037.61 Å) obtained from SUMER/SOHO on the solar south limb. We calculated Doppler shifts and consequently Doppler velocities in three heights 4″, 14″, and 24″ from the limb on a coronal hole region. Then, we performed wavelet analysis with Morlet wavelet transform to determine the periods of fundamental mode and its first harmonic mode. The calculated period ratios have departures from its canonical value of 2. The… 
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Torsional Alfvén waves and the period ratio P1/P2 in spicules

The effects of both density stratification and magnetic field expansion on torsional Alfvén waves in solar spicules are studied. Also, their eigenfrequencies, eigenfunctions, and the period ratio…

The period ratio P1/P2$P_{1}/P_{2}$ of torsional Alfvén waves with steady flows in spicules

The aim here is to model the standing torsional oscillations in solar spicules in the presence of density stratification, magnetic field expansion, and steady flows. By implementing cylindrical…

Dynamic wave-modes in solar chromospheric structures

Sun’s outer atmosphere is a million degree hotter than it’s visible surface, which is not understood with any of the known laws of thermodynamics and remains an intriguing problem for the…

Torsional waves with force-free magnetic fields in solar plasma structures

The aim here is to model torsional waves in homogeneous and expanding twisted flux tubes of solar coronal magnetic plasma structures. For the sake of simplicity, a force-free condition applicable…

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