The reversal behavior of some hydrogen Lyman Lines in Spicules
ajabshirizadeh Ali, 1-Research Institut for Astron.&Astrophysics of Maragha.2-Azad University of Tabriz.3-Uni.of Tabriz
Vial, J. Claude - Koutchmy, Serge - Fathi, Hassan
Paris-sud University, - Pierre et Marie Curie University, -Tabriz University
| Spicules are the dominant component of the quiet solar chromosphere. At the solar limb they appear as jet-like dynamic structures extending into the solar corona. The physical processes that generate spicules have not yet been uniquely identified.
In this work, we analyze spicules data taken by the SUMER spectrometer on-board SoHO in the Lyman Beta and Lyman Gamma lines. A similar analysis has been done already for the prominences by Vial et al. (2007) in the Lyman Alpha and Lyman Beta lines..
The data used have a spatial resolution of one arcsec along the slit and a spectral resolution of about 44 mA.
We applied the standard procedures for geometric distortion, flat fielding and dead time corrections, which can be found in the Solar Software (SSW) database.
Our results show that in spicules both Lyman Beta and Lyman Gamma line profiles are reversed at all altitudes; on the contrary, in the prominence, the Lyman Beta and Lyman Gamma line profiles are reversed only at higher altitude, while at lower altitude they are clearly non-reversed in accordance with Vial et al. (2007). We provide some explanation for this behaviour.