[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5303/JKAS.2003.36.spc1.063

SOLAR MICROWAVE BURSTS AND ELECTRON KINETICS

LEE JEONGWOO (Physics Department, New Jersey Institute of Technology)
BONG SU-CHAN (Astronomy Program, SEES, Seoul National University)
YUN HONG SIK (Astronomy Program, SEES, Seoul National University)

Publication Information

Journal of The Korean Astronomical Society / v.36, no.spc1, 2003 , pp. 63-73 More about this Journal

Abstract

Solar flares present a number of radiative characteristics indicative of kinetic processes of high energy particles. Proper understanding of the kinetic processes, however, relies on how well we can separate the acceleration from transport characteristics. In this paper, we discuss microwave and hard X-ray bursts as a powerful tool in investigating the acceleration and transport of high energy electrons. After a brief review of the studies devoted to the kinetic process of solar flare particles, we cast them into a simple formulation which allows us to handle the injection, trap, and precipitation of flare electrons self-consistently. The formulation is then taken as a basis for interpreting and analyzing a set of impulsive and gradual bursts occurred on 2001 April 6 observed with the Owens Valley Solar Array, and HXT/WBS onboard Yohkoh satellite. We quantify the acceleration, trap, and precipitation processes during each burst in terms of relevant time scales, and also determine ambient density and magnetic field. Our result suggests that it should be the acceleration property, in particular, electron pitch angle distribution, rather than the trap condition, that is mainly responsible for the distinctive properties of the impulsive and gradual flares.

Keywords

Sun: flares; Sun: radio radiation; Sun: magnetic fields; radiation mechanisms: nonthermal;

Citations & Related Records

Reference

1	Scherrer, P. H., et al. 1995, The Solar Oscillations Investigation - Michelson Doppler Imager, Sol. Phys., 162, 129 DOI
2	Silva, A. V. R., Wang, H., & Gary, D. E. 2000, Correlation, of Microwave and Hard X-Ray Spectral Parameters, ApJ, 545, 1116 DOI ScienceOn
3	Spitzer, L. 1967, The Physics of Fully Ionized Gases (2d ed., New York: Interscience)
4	Takakura, T. & Kai. K. 1966, Energy Distribution of Electrons Producing Microwave Impulsive Bursts and X-Ray Bursts from the Sun, PASJ 18, 57
5	Vilmer, N., Kane, S. R., & Trottet, G. 1982, mpulsive and gradual hard X-ray sources in a solar flare, A&A, 108. 306
6	Yoshimori, M., Okudaira, K., Hirasima, Y., Igarashi, T., Akasaka, M., Takai, Y., Morimoto, K., Watanabe, T., Ohki, K., & Nishimura, J. 1991, The wide band spectrometer on the Solar-A, Sol. Phys., 136, 69 DOI
7	Zirin, H. & Tanaka, K. 1981, Magnetic transients in Bares, ApJ, 250, 791 DOI
8	Miller, J. A. & Steinacker, J. 1992, Stochastic gyroresonant electron acceleration on a low-beta plasma. II - Implications of thermal effects in a solar flare plasma, ApJ, 399, 284 DOI
9	Miller, J. A., Cargill, P. J., Emslie, A. G., Holman, G. D., Dennis, B. R., LaRosa, T. N., Winglee, R. M., Benka, S. G., & Tsuneta, S. 1997, Critical Issues For Understanding Particle Acceleration in Impulsive Solar Flares, J. Geophys. Res., 102, 14631 DOI
10	Moghaddam-Taaheri, E. & Goertz, C. K. 1990, Acceleration of runaway electrons in solar flares, ApJ, 352, 361 DOI
11	Nishio, M., Yaji, K., Kosugi, T., Nakajima, H., & Sakurai, T. 1997, Magnetic Field Configuration in Impulsive Solar Flares Inferred from Coaligned Microwave/X-Ray Images, ApJ, 489, 976 DOI ScienceOn
12	Petrosian, V. 1982, Structure of the impulsive phase of solar flares from microwave observations, ApJ, 255, L85 DOI
13	Petrosian, V. 1990, Acceleration, transport of and radiation by electrons in impulsive phase of flares, in Basic plasma processes on the sun (A92-30901 12-92) Dordrecht, Netherlands, Kluwer Academic Publishers, p. 391
14	Ramaty, R. 1969, Gyrosynchrotron Emission and Absorption in a Magnetoactive Plasma, ApJ, 158, 753 DOI
15	Sakao, T. 1994, Characteristics of solar flare hard X-ray sources as revealed with the Hard X-ray Telescope aboard the Yohkoh satellite, Ph.D. thesis, University of Tokyo
16	Melrose, D. B. 1980, Plasma Astrophysics, (New York Gordon and Breach)
17	Melrose, D. B. & Brown, J. C. 1976, Precipitation in trap models for solar hard X-ray bursts, MNRAS, 176, 15 DOI
18	Litvinenko, Y. E. 1996, Particle Acceleration in Reconnecting Current Sheets with a Nonzero Magnetic Field, ApJ, 462, 997 DOI ScienceOn
19	Lee, J., Gary, D. E., Qiu, J., & Gallagher, P. T. 2002, Electron Transport during the 1999 August 20 Flare Inferred from Microwave and Hard X-Ray Observations, ApJ, 572, 609 DOI ScienceOn
20	Lee, J., Gallagher, P. T., Gary, D. E., Nita, G. M., Choe, G. S., Bong, S.-C., & Yun, H. S. 2003, Halpha;, Extreme-Ultraviolet, and Microwave Obser vations of the 2000 March 22 Solar Flare and Spontaneous Magnetic Reconnection, ApJ, 585, 524 DOI ScienceOn
21	Lu, E. T. and Petrosian, V. 1988, Rapid temporal evolution of radiation from nothermal electrons in solar flares, ApJ, 327, 405 DOI
22	MacKinnon, A. L. 1991, Collisional scattehng of fast electrons in a coronal magnetic bottle, A&A, 242, 256
23	Marsh, K. A. & Hurford, G. J., 1982, High spatial resolution solar microwave observations, ARA&A, 20, 497 DOI ScienceOn
24	Melnikov, V. F. 1990, Relationships between Microwave, Hard X ray, and Corpuscular Emissions of Solar Flares, Ph.D. Thesis, Radiophysical Research Institute, Nizhniy Novgorod, Russia
25	Melnikov, V. F. 1994, Particle Acceleration and Capturing in Impulsive and Gradual Bursts, Radiophys. Quant. Electron. 37, 557
26	Melnikov, V. F. & Magun, A. 1998, Spectral Flattening During Solar Radio Bursts At Cm-mm Wavelengths and the Dynamics of Energetic Electrons in a Flare Loop, Sol. Phys., 178, 153 DOI ScienceOn
27	Melnikov, V. F., Shibasaki, K., & Reznikova, V. E. 2002, Loop-Top Nonthermal Microwave Source in Extended Solar Flaring Loops, ApJ, 580, L85 DOI ScienceOn
28	Kundu, M. R., White, S. M., Shibasaki, K., Sakurai, T., & Grechmev, V. V. 2001a, Spatial Structure of Simple Spiky Bursts at Microwave/Millimeter Wavelengths, ApJ, 547, 1090 DOI ScienceOn
29	Kosugi, T., Dennis, B. R., & Kai, K. 1988, Energetic electrons in impulsive and extended solar flares as deduced from flux correlations between hard X-rays and microwave, ApJ, 324, 1118 DOI
30	Kosugi, T., Masuda, S., Makishima, K., Inda, M., Murakami, T., Dotani, T., Ogawara, Y., Sakao, T., Kai, K., & Nakajima, H. 1991, The hard X-ray telescope (HXT) for the Solar-A mission, Sol. Phys., 136, 17 DOI
31	Kundu, M. R., Grechnev, V. V., Garaimov, V. I., & White, S. M. 2001b, Double Loop Configuration of a Flaring Region from Microwave, Extreme Ultraviolet, and X-Ray Imaging Data, ApJ, 563, 389 DOI ScienceOn
32	Kundu, M. R., Nitta, N., White, S. M., Shibasaki, K., Enome, S., Sakao, T., Kosugi, T., & Sakurai, T. 1995, Microwave and Hard X-Ray Observations of Footpoint Emission from Solar Flares, ApJ, 454, 522 DOI
33	Lee, J. & Gary, D. E. 1994, Spectral evolution of microwaves and hard X-rays in the 1989 March 18 flare and its interpretation, Sol. Phys., 153, 347 DOI
34	Lee, J. & Gary, D. E. 2000, Solar Microwave Bursts and Injection Pitch-Angle Distribution of Flare Electrons, ApJ, 543, 457 DOI ScienceOn
35	Lee, J., Gary, D. E., & Zirin, H. 1994, Flat microwave spectra seen at X-class flare, Sol. Phys., 152, 409 DOI
36	Lee, J., Gary, D. E., & Shibasaki, K. 2000, Magnetic Trapping and Electron Injection in Two Contrasting Solar Microwave Bursts, ApJ, 531, 1109 DOI ScienceOn
37	Holman, G. D. 1985, Acceleration ofrunaway electrons and Joule heating in solar flares, ApJ, 293, 584 DOI
38	Hamilton, R. J. & Petrosian, V. 1992, Stpchastic acceleration of electrons. I - Effects of collisions in solar flares, ApJ, 398, 350 DOI
39	Hanaoka, Y. 1996, Flares and Plasma Flow Caused by Interacting Coronal Loops, Sol. Phys., 165, 275 DOI
40	Hanaoka, Y. 1997, Double-Loop Conflguration of Solar Flares, Sol. Phys., 173, 319 DOI ScienceOn
41	Holman, G. D., Kundu, M. R., & Papadopoulos, P. 1982, Electron pitch angle scattering and the impulsive phase microwave and hard X-ray emissioii from solar flares, ApJ, 257, 354 DOI
42	Kai., K. 1986, Can observed hard X-ray and microwave flux from solar flares be explained by a single electron population?, Sol. Phys., 104, 235 DOI
43	Kai, K. Kosugi, T., & Nitta, N. 1985, Flux relations between hard X-rays and microwaves for both impulsive and extended solar flares, PASP, 37, 155
44	Kemiel, C. F. & Petscheck, H. E. 1966, Limit on stably trapped particle fluxes, J. Geophys. Res., 71, 1 DOI
45	Klein, K.-L., Trottet, G., & Magun, A. 1986, Microwave diagnostics of energetic electrons in flare, Sol. Phys., 104, 243 DOI
46	Fleishman, G. D. & Melnikov, V. F. 2003, Gyrosynchrotron Emission from Anisotropic Electron Distribution, ApJ, 587, 823 DOI ScienceOn
47	Bai, T. 1982, Transport of energetic electrons in a fully ionized hydrogen plasma, ApJ, 308, 912 DOI
48	Gary, D. E. & Hurford, G. J. 1999, OVRO Solar Array Upgrades in Preparation for MAX 2000 in Proceedings of the Nobeyama Symposium, held in Kiyosato, Japan,.0ct. 27-30, 1998, (Eds.) T. S. Bastian, N. Gopalswamy and K. Shibasaki, NRO Report No. 479., p.429-432
49	Aschwanden, M. J., Schwartz, R. A., & Dennis, B. R. 1998, Deconvolution of Directly Precipitating and Trap-precipitating Electrons in Solar Flare Hard X-Rays. II. Compton Gamma Ray Observatory Data Analysis, ApJ, 502, 468 DOI
50	Aschwanden, M. J., Fletcher, L., Sakao, T., Kosugi, T. & Hudson, H. 1999, Deconvolution of Directly Precipitating and Trap-precipitating Electrons in Solar Flare Hard X-Rays. III. Yohkoh Hard X-Ray Telescope Data Analysisi, ApJ, 515, 842 DOI ScienceOn
51	Bai, T. 1986, Two classes of gamma-ray/Proton flares - Impulsive and gradual, ApJ, 308, 912 DOI
52	Bai, T. & Ramaty, R. 1979, Hard X-ray time profiles and acceleration processes in large solar flares, ApJ, 227, 1072 DOI
53	Bai, T. & Sturrock, P. A., 1989, Classification of solar flares, ARA&A, 27, 421 DOI ScienceOn
54	Bruggmann, G., Vilmer, N., Klein, K.-L., & Kane, S. R. 1994, Electron trapping in evolving coronal structures during a large gradual hard X-ray/radio burs, Sol. Phys., 149, 171 DOI
55	Cornell, M. E., Hurford, G. J., Kiplinger, A. L., & Dennis, B. R. 1984, The relative timing of microwaves and hard X-rays in solar flares, ApJ, 279, 875 DOI
56	Aschwanden, M. J. 2003, Particle Acceleration and Kinematics in Solar Flares, SPACE SCIENCE REVIEWS, Volume 101, Kluwer Academic Publishers, Dordrecht
57	Crannell, C. J., Frost, K. J., Saba, J. L., Maetzler, C. & Ohki, K. 1978, Impulsive solar X-ray bursts, ApJ, 223, 620 DOI
58	Ding, M. D., Qiu, J., & Wang, H. 2002, Non-LTE Calculation of the Ni I 676.8 Nanometer Line in a Flaring Atmosphere, ApJ, 576, L83 DOI ScienceOn
59	Aschwanden, M. J. 1998, Deconvolution of Directly Precipitating and Trap-precipitating Electrons in Solar Flare Hard X-Rays. I. Method and Tests, ApJ, 502, 455 DOI
60	Aschwanden, M. J., & Alexander, D. 2001, Flare Plasma Cooling from 30 MK down to 1 MK modeled from Yohkoh, GOES, and TRACE observations during the Bastille Day Event (14 July 2000), Sol. Phys., 204, 93
61	Aschwanden, M. J., Bynum, R. T., Kosugi, T., Hudson, H., and Schwartz, R.A. 1997, Electron Trapping Times and Trap Densities in Solar Flare Loops Measured with Compton and YOHKOH, ApJ, 487, 936 DOI ScienceOn