Constraints on the O+5 Anisotropy in the Solar Corona
作者： L. Ofman , A. Viñas , S. P. Gary
DOI: 10.1086/318900
关键词:
摘要: Velocity distributions of O+5 ions derived from Ultraviolet Coronagraph Spectrometer (UVCS) observations in coronal holes indicate that the are highly anisotropic (T⊥i/T∥i ≈ 30-300 at 3.5 R☉). The provide empirical values for electron density and ion temperatures. It is well known electromagnetic cyclotron instability driven by temperature anisotropy. leads to rapid decrease anisotropy transfer part kinetic energy particles into magnetic field fluctuations. Here we use linear theory hybrid simulations combined with densities temperatures investigate minor hole plasma. We find an initial 50 decreases order magnitude within ~300-900 proton periods. Thus, constrains can be sustained solar corona without continuous perpendicular heating.
harvard.edu
sci-hub.se 参考文章(14)
M.A. Dodero, E. Antonucci, S. Giordano, R. Martin, Solar Wind Velocity and Anisotropic Coronal Kinetic Temperature Measured with the O VI Doublet Ratio Solar Physics. ,vol. 183, pp. 77- 90 ,(1998) , 10.1023/A:1005007429583
L. Ofman, J. M. Davila, Two-fluid 2.5D MHD model of the fast solar wind and the effective proton temperature American Institute of Physics Conference Series. ,vol. 471, pp. 405- 408 ,(2008) , 10.1063/1.58835
E. C. Sittler, D. Chornay, J. Keller, K. W. Ogilvie, A. Roberts, Observational requirements for in situ plasma instrumentation for Solar Probe Scientific basis for robotic exploration close to the sun. ,vol. 385, pp. 59- 66 ,(2008) , 10.1063/1.51767
S. Cuperman, L. Ofman, M. Dryer, Nonlinear aspects of collective, electromagnetic interactions in magnetized plasmas with anisotropic protons and isotropic alpha particles Journal of Plasma Physics. ,vol. 36, pp. 387- 405 ,(1986) , 10.1017/S0022377800011867
Douglas S Harned, Quasineutral hybrid simulation of macroscopic plasma phenomena Journal of Computational Physics. ,vol. 47, pp. 452- 462 ,(1982) , 10.1016/0021-9991(82)90094-8
S. R. Cranmer, J. L. Kohl, G. Noci, E. Antonucci, G. Tondello, M. C. E. Huber, L. Strachan, A. V. Panasyuk, L. D. Gardner, M. Romoli, S. Fineschi, D. Dobrzycka, J. C. Raymond, P. Nicolosi, O. H. W. Siegmund, D. Spadaro, C. Benna, A. Ciaravella, S. Giordano, S. R. Habbal, M. Karovska, X. Li, R. Martin, J. G. Michels, A. Modigliani, G. Naletto, R. H. O'Neal, C. Pernechele, G. Poletto, P. L. Smith, R. M. Suleiman, An Empirical Model of a Polar Coronal Hole at Solar Minimum The Astrophysical Journal. ,vol. 511, pp. 481- 501 ,(1999) , 10.1086/306675
Tadas K. Nakamura, Limit of temperature anisotropy relaxation by ion cyclotron waves: A statistical theory Physics of Plasmas. ,vol. 7, pp. 4812- 4815 ,(2000) , 10.1063/1.1321015
L. Ofman, J. M. Davila, Do First Results from SOHO UVCS Indicate that the Solar Wind is Accelerated by Solitary Waves The Astrophysical Journal. ,vol. 476, ,(1997) , 10.1086/310491
Y. Z. Agim, A. F. Viñas, M. L. Goldstein, Magnetohydrodynamic and hybrid simulations of broadband fluctuations near interplanetary shocks Journal of Geophysical Research. ,vol. 100, pp. 17081- 17106 ,(1995) , 10.1029/95JA00527
Shadia Rifai Habbal, Xing Li, Xing Li, Giancarlo Noci, John L. Kohl, The Effect of Temperature Anisotropy on Observations of Doppler Dimming and Pumping in the Inner Corona The Astrophysical Journal. ,vol. 501, ,(1998) , 10.1086/311428