The temperature structure of solar coronal plasmas

Feldman, Uri; Landi, Enrico
May 2008
Physics of Plasmas;May2008, Vol. 15 Issue 5, p056501
Academic Journal
In the early 1940s it was at last accepted that the temperature of the solar corona is at least 1 MK and varies considerably from region to region throughout the solar activity cycle. It was recognized that during solar minimum periods the electron temperatures of plasmas in polar regions do not exceed 1 MK, but during solar maximum periods the plasma temperatures of highly active regions could be as high as 3 MK. Nevertheless, until recently the consensus among the solar physics community was that coronal temperatures vary among the different regions in a continuous manner. In the present paper we review the evidence showing that solar coronal plasmas (Te>0.7 MK) are isothermal and their temperature can have only a small set of fixed values.


Related Articles

  • Relation between current sheets and vortex sheets in stationary incompressible MHD. Nickeler, D. H.; Wiegelmann, T. // Annales Geophysicae (09927689);Mar2012, Vol. 30 Issue 3, p545 

    Magnetohydrodynamic configurations with strong localized current concentrations and vortices play an important role in the dissipation of energy in space and astrophysical plasma. Within this work we investigate the relation between current sheets and vortex sheets in incompressible, stationary...

  • Radiation effects on the MHD wave behavior in the solar corona. Mikhalyaev, B.; Veselovskii, I.; Khongorova, O. // Solar System Research;Jan2013, Vol. 47 Issue 1, p50 

    The effect of radiation losses on the dispersion and damping of magnetohydrodynamic waves in the solar corona is studied. The conditions are determined under which radiation losses are most appreciable. A damping of kink modes of coronal loops with plasma temperatures within 10-10 K and 10-10 K...

  • Dayside Proton Aurora: Comparisons between Global MHD Simulations and IMAGE Observations. Berchem, J.; Fuselier, S.A.; Petrinec, S.; Frey, H.U.; Burch, J.L. // Space Science Reviews;Jun2003, Vol. 109 Issue 1-4, p313 

    The IMAGE mission provides a unique opportunity to evaluate the accuracy of current global models of the solar wind interaction with the Earth's magnetosphere. In particular, images of proton auroras from the Far Ultraviolet Instrument (FUV) onboard the IMAGE spacecraft are well suited to...

  • Additional Plasma Streams with Steep Fronts in Structures of Enhanced Brightness in the Coronal Streamer Belt. Eselevich, M. V.; Eselevich, V. G. // Astronomy Reports;Aug2004, Vol. 48 Issue 8, p688 

    The presence of additional plasma streams with enhanced density in bright rays of the solar coronal-streamer belt is demonstrated. The streams have steep fronts, whose widths δ ≈ 0.10R⊙ (where R⊙ is the solar radius) are comparable to the spatial resolution of the LASCO C3...

  • Methods of Plasma Turbulence Analysis: Application to Shock Studies. Balikhin, M. A.; Walker, S. N. // AIP Conference Proceedings;2005, Vol. 781 Issue 1, p123 

    The availability of multisatellite observations (e.g. ISEE, AMPTE, and Cluster) has triggered the development of new methods of analysis to shed light on the complex dynamics inherent in the solar wind and magnetosphere. This paper looks at the results of two such methods. Firstly, the phase...

  • Absorption Phenomena and a Probable Blast Wave in the 13 July 2004 Eruptive Event. Grechnev, V. V.; Uralov, A. M.; Slemzin, V. A.; Chertok, I. M.; Kuzmenko, I. V.; Shibasaki, K. // Solar Physics;Dec2008, Vol. 253 Issue 1/2, p263 

    We present a case study of the 13 July 2004 solar event, in which disturbances caused by eruption of a filament from an active region embraced a quarter of the visible solar surface. Remarkable are the absorption phenomena observed in the SOHO/EIT 304 Ã… channel, which were also visible in...

  • Comparison of Voyager Shocks in Solar Cycle 23. Ashmall, Justin; Richardson, John // AIP Conference Proceedings;2005, Vol. 781 Issue 1, p299 

    Solar cycle 23 was notable for two periods of intense solar activity (or ‘events’ as we shall hereafter refer to them): the ‘Bastille Day Event’ of 2000 and the ‘Halloween Event’ of 2003. In this paper we look at the signatures of the interplanetary shocks...

  • Solar Radius Variations Measured in Central Eclipses. Sigismondi, Costantino // AIP Conference Proceedings;1/3/2008, Vol. 966 Issue 1, p341 

    Data on Baily beads observed in total eclipse of March 29, 2006 (Egypt) and those of annular eclipses of September 22, 2006 (French Guyana) and October 3, 2005 (Spain) are used to evaluate the variations of solar radius with respect to its standard value during a whole draconitic year. A...

  • Alfvén Intermittent Turbulence in Space Plasmas. Rempel, E. L.; Chian, A. C.-L.; Preto, A. J.; Stephany, S. // AIP Conference Proceedings;2005, Vol. 784 Issue 1, p79 

    We investigate the onset of intermittent chaos in the phase dynamics of nonlinear Alfvén waves in the solar wind by using the Kuramoto-Sivashinsky (KS) equation as a model for phase dynamics. We focus on the role of nonattracting chaotic solutions of the KS equation, known as chaotic saddles,...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics