Connection between Photospheric Magnetic Fields and Coronal Structure/Dynamics [Invited]

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Scientific paper

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Scientific paper

Continuous observations of the solar X-ray corona with Yohkoh Soft X-ray Telescope (SXT) have been revealing that dynamical phenomena, such as coronal jets and microflares (transient loop brightenings) are common in the corona, especially in the active-region corona. Moreover, the heating of the corona is about two order of magnitude more significant in the active regions than in the quiet regions. Since observations of magnetic fields at the photosphere show that magnetic fields are much more concentrated into active regions, it has been widely believed that magnetic fields would be responsible for the heating of the corona as well as dynamics in the corona. A lot of complicated magnetic activities are observed at the photosphere; newly emerging magnetic fields, marging to the same-polarity magnetic fields, cancelling magnetic fields with the opposite-polarity magnetic fields, developing the shear in magnetic field structure, and so on. How are these magnetic activities associated with the dynamics and heating well observed in the coronaNULL A lot of investigations have been made by comparing Yohkoh observations with observations of photospheric magnetic fields. This paper reviews some of investigations made in the last decade. Solar-B is now under development for the launch scheduled in 2005. Its primary objective is to study the connection of the dynamics and heating observed in the solar corona with the magnetic field at the solar surface. For great advances in understanding the magnetic connection between the photosphere and the corona with Solar-B, it is significant important to review the recent knowledges obtained in the Yohkoh era.

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