On the possibility of the development of longitudinal wave instabilities on the background of the small-scale Bernstein turbulence in preflare chromosphere of a solar active region
|1Kryshtal, AN, 1Voitsekhovska, AD, 1Gerasimenko, SV, 2Sidorenko, MV |
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
2Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
|Kinemat. fiz. nebesnyh tel (Online) 2014, 30(5):39-55|
|Start Page: Solar Physics|
We investigate the process of rise and development for instabilities of the longitudinal waves of two types, namely, low-frequency ion-acoustic and high-frequency (“electronic”) Langmuir ones, for preflare solar atmosphere plasma in an active region. The area under investigation is located at the chromosphere part of the flare loop near its footpoint. The large-scale weak electric field of flare loop is the main driver of these instabilities. The velocity of the electronic flow in preflare plasma is supposed to be much less than electron thermal velocity. Instability development is considered on the background of the small-scale Bernstein wave turbulence which exists in preflare plasma and has an extremely low threshold of excitation. The necessary conditions of the instability rise and development as well as the boundary values of the main characteristics of plasma and wave perturbations are obtained.
|Keywords: Bernshtein's turbulence, chromosphere, Sun|
1.A. F. Aleksandrov, L. S. Bogdankevich, and A. A. Rukhadze, Plasma Hydrodynamics Foundations (Vysshaya shkola, Moscow, 1989) [in Russian].
2.A. T. Altyntsev, V. G. Banin, G. V. Kuklin, and V. M. Tomozov, Solar Bursts (Nauka, Moscow, 1982) [in Russian].
3.G. Grim, Broadening of Spectral Lines in Plasma (Mir, Moscow, 1978) [in Russian].
4.V. V. Zaitsev, A. P. Stepanov, and Yu. T. Tsap, “Some problems of solar and star flare physics,” Kinematika Fiz. Nebesnykh Tel 10(6), 3–31 (1994).
5.A. N. Krishtal’, S. V. Gerasimenko, and A. D. Voitsekhovskaya, “To the question of possibility of appearance of preflare current sheathes in the chromosphere of an active solar region,” Kosm. Nauka Tekhnol. 18(3), 52–60 (2012).
6.A. N. Krishtal’, S. V. Gerasimenko, A. D. Voitsekhovskaya, and A. A. Solov’ev, “To the question of a possibility of development of Langmuir turbulence development during the early stage of a flare process,” Kosm. Nauka Tekhnol. 15(5), 59–67 (2009).
7.V. E. Reznikova, V. F. Mel’nikov, S. P. Gorbikov, and K. Shibasaki, “Dynamics of radio brightness distribution along a flaring loop,” in Abstracts of the Conf. “Plasma Physics in the Solar System”, Moscow, SPI RAS, February 5–8, 2008 (SRI RAS, Moscow, 2008), p. 17 [in Russian].
8.B. V. Somov, V. S. Titov, and A. I. Vernetta, “Magnetic reconnection in solar flares,” in Science and Engineering Results Summary, Available from VINITI. Astronomiya 34, 136–237 (1987) [in Russian].
9.Yu. E. Charikov, “Preflare stage of energy accumulation: New observations and possible mechanisms,” in Abstracts of the 11th Pulkovo Intern. Conf. on Solar Physics, MAO RAS, Pulkovo, St. Petersburg, July 2–7, 2007 (St. Petersburg, 2007), pp. 138–139 [in Russian].
10.F. F. Chen, Introduction to Plasma Physics and Controlled Fusion (Plenum, New York, 1984).
11.O. A. Sheiner and V. M. Fridman, “Microwave radiation structure in view of the plasma diagnostics in the solar atmosphere,” in Abstracts of the Conf. “Plasma Physics in the Solar System”, Moscow, SPI RAS, February 5–8, 2008 (SRI RAS, Moscow, 2008), p. 10 [in Russian].
12.M. I. Aschwanden, “An evaluation of coronal heating models for active regions based on Yohkoh, SOHO and TRACE observations,” Astrophys. J. 560, 1035–1043 (2001).
13.J. M. Fontenla, E. H. Avrett, and R. Loeser, “Energy balance in solar transition region. III. Helium emission in hydrostatic, constant-abundance models with diffusion,” Astrophys. J. 406(1), 327–336 (1993).
14.P. Foukal and S. Hinata, “Electric fields in the solar atmosphere: A review,” Solar Phys. 132(2), 307–334 (1991).
15.A. A. Galeev, D. Lominadze, A. Pataria, et al., “Anomalous resistance of plasma due to the instability of the cyclotron harmonics,” Zh. Eksp. Teor. Fiz., 417–420 (1972).
16.A. A. Galeev and R. Z. Sagdeev, “Nonlinear plasma theory,” Probl. Plasma Theory 7, 3–48 (1973).
17.A. A. Galeev and R. Z. Sagdeev, “Current instabilities and anomalous resistance of plasma,” in Handbook of Plasma Physics. Basic Plasma Physics, Ed. by A. A. Galeev and R. N. Sudan (Amsterdam, 1984), Vol. 2, pp. 272–303.
18.J. Heyvaerts, E. R. Priest, and D. M. Rust, “Models of solar flares,” Astrophys. J. 216, 213–221 (1977).
19.A. N. Kryshtal, “Bernstein wave instability in a collisional plasma with a quasistatic electric field,” J. Plas. Phys. 60(3), 469–484 (1998).
20.A. N. Kryshtal, S. V. Gerasimenko, and A. D. Voitsekhovska, ““Oblique” Bernstein modes in solar preflare plasma: Generation of second harmonics,” Adv. Space Res. 49, 791–796 (2012).
21.A. N. Kryshtal and V. P. Kucherenko, “A possible excitation mechanism for a longitudinal wave instability in a plasma by a quasi-static electric field,” J. Plasma. Phys 53(2), 169–183 (1995).
22.A. N. Kryshtal and V. P. Kucherenko, “Ion-acoustic instability caused by large-scale electric field in solar active regions,” Solar Phys. 165(1), 139–153 (1996).
23.M. E. Machado, E. H. Evrett, J. E. Vernazza, and R. W. Noyes, “Semiempirical models of chromospheric flare regions,” Astrophys. J. 242(1), 336–351 (1980).
24.V. F. Melnikov, K. Shibasaki, and V. E. Reznikova, “Loop-top nonthermal microwave source in extended solar flaring loops,” Astrophys. J. 580, L185–L188 (2002).
25.I. A. Miller, P. I. Cargil, A. G. Emslie, et al., “Critical issues for understanding particle acceleration in impulsive solar flares,” J. Geophys. Res. 102(A7), 14631–14659 (1997).
26.D. Pines and J. R. Schrieffer, “Collective behavior in solid-state plasmas,” Phys. Rev. 124(5), 1387–1400 (1961).
27.S. K. Solanki, “Small-scale solar magnetic fields: An overview,” Space Sci. Revs. 63, 1–183 (1993).
28.J. E. Vernazza, E. H. Avrett, and R. Loeser, “Structure of the solar chromosphere. III. Models of the EUV brightness components of the quiet-sun,” Astrophys. J., Suppl. Ser. 45(1), 635–725 (1981).