Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..29h&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
This review focuses on dynamics of the magnetized solar chromosphere. In the quiet chromosphere we distinguish between the magnetic network on the boundary of super-granulation cells, where strong magnetic fields are organized in mainly vertical magnetic flux tubes, and inter-network regions in the cell interior, where magnetic fields are weak and dynamically unimportant. Observations have firmly established the presence of oscillations in the solar chromosphere. Both the network and inter-network media show bright points (BPs), which are prominent in the emission peaks in the cores of the Ca II H and K lines. However, the dynamical and spectral properties of network and inter-network BPs are quite different. In the latter the chromospheric velocity power spectrum is dominated by oscillations having power in the 5-7 mHz range, which can essentially be regarded as acoustic waves, whereas the network exhibits low-frequency oscillations with periods 7-20 min. The qualitative properties of inter-network BPs are reasonably well understood, including their formation in upward propagating acoustic shocks that encounter downward-flowing gas. On the other hand, the physical processes that heat the magnetic network have not been fully identified. Are network BPs heated by wave dissipation and if so, what is the nature of these waves? These and other aspects relating to the dynamics and energy transport mechanisms will be discussed in detail. Furthermore, a critical assessment will be made on the challenges facing theory and the direction for future investigations, particularly in the light of the new space experiments, will be highlighted.
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