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Heating the Solar Corona by Magnetic Reconnection

Priest, E. R.

Here I review briefly the theory of magnetohydrodynamic reconnection and ask what observational evidence is there that it is heating the corona. In particular, the new directions in which three-dimensional theory for reconnection is heading are outlined. Part of the coronal heating problem has been solved with the identification of reconnection dr…

Cyclotron Heating of the Solar Corona

Marsch, Eckart

A physical model of the solar transition region and corona is presented, in which plasma flows in rapidly-diverging coronal funnels and holes are described within the framework of a two-fluid model including wave-particle interactions. The ions are heated by wave dissipation and accelerated by the pressure gradient of high-frequency Alfvén waves, …

The Darkest Regions of Solar Polar Coronal Holes Observed by SUMER on SOHO

Wilhelm, Klaus

Recent Developments in Quasilinear Cosmic Ray Particle Acceleration Theories

Vainio, Rami; Schlickeiser, Reinhard

Several recent results of quasilinear cosmic ray transport theory are reviewed. It is shown that modelling the plasma turbulence beyond the magnetostatic approximation is most important for a correct description of cosmic ray dynamics. In particular, the effects of finite plasma wave speeds play a crucial role both for the behaviour of the particl…

High Energetic Electrons Accelerated by a Coronal Shock Wave

Mann, G.; Kunow, H.; Motschmann, U. +2 more

Combined SOHO (Solar and Helisopheric Observatory) and ground based radio observations show evidently signatures of electrons accelerated by a shock wave during the event on July 9, 1996. A solar type II radio burst has been received as a signature of a coronal shock wave at 300 MHz on 9:10:54 UT. It was accompanied with electron beams appearing a…

Coronal Holes Versus Normal Quiet Sun Observed with SUMER

Solanki, S. K.; Wilhelm, K.; Brković, A. +5 more

We present a preliminary analysis of spectral lines obtained with the SUMER instrument (Solar Ultraviolet Measurements of Emitted Radiation) onboard the Solar and Heliospheric Observatory (SOHO), as observed during three observing campaigns. From the 70 observed spectral lines, we selected 12, representing 9 ions or atoms, in order to analyse line…