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A lightning VHF radiation source location system based on short-baseline technology is used to study the location of VHF radiation source in the lightning discharge process. The observation was conducted in Daxing'anling during summer of 2009. Positive cloud-to-ground (CG) lightning, negative CG lightning, and intra-cloud (IC) lightning are analyzed based on the locating results and simultaneous electric field changes. The long lasting preliminary breakdown process of CG flash appears as two-level structure of discharge channel in cloud. There are obvious recoil streamers during the final stage of preliminary breakdown process. The preliminary breakdown process propagates at a speed of about 104 m/s. The preliminary breakdown seems to be necessary for the initiation of stepped leader. The stepped leader starts from the source region of preliminary breakdown and propagates downwards. The stepped leader produces intensive VHF radiation. The propagation speed of stepped leader is about 105 m/s. The K process is caused by the streamers propagating backwards and forwards along the electrified channel. Characteristics of discharge processes before and after the return stroke of positive CG flash are different from those of negative CG flash obviously. During long continuing current after the return stroke of positive CG flash, discharges in cloud produce intensive VHF radiation. The energy spectrum of the VHF radiation produced by lightning is studied statistically. It is found that the energy spectrum of VHF radiation decreases quickly with the frequency at a rate of about f-2.9 between 125 and 200 MHz.
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Keywords:
- lightning /
- VHF radiation source /
- discharge channel /
- time of arrival locating technique /
- short baseline
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[1] [2] Rhodes C T, Shao X M, Krehbiel P R, Thomas R J, Hayenga C O 1994 J. Geophys. Res. 99 13059
[3] [4] Shao X M, Krehbiel P R, Thomas R J, Rison W R 1995 J. Geo-phys. Res. 100 2749
[5] Shao X M, Holden D N, Rhodes C T 1996 Geophys. Res. Lett. 23 1917
[6] [7] [8] Kawasaki Z I, Mardiana R, Ushio T 2000 Geophys. Res. Lett. 27 3189
[9] [10] Rison W R, Thomas R J, Krehbiel P R, Hamlin T, Harlin J 1999 Geophys. Res. Lett. 26 3573
[11] Thomas R J, Krehbiel P R, Rison W R, Hunyady S J, Winn W P, Hamlin T, Harlin J 2004 J. Geophys. Res. 109 D14207
[12] [13] [14] Zhao Y, Qie X S, Kong X Z, Zhang G S, Zhang T, Yang J, Feng G L, Zhang Q L, Wang D F 2009 Acta Phys. Sin. 58 6616 (in Chinese) [赵阳, 郄秀书, 孔祥贞, 张广庶, 张彤, 杨静, 冯桂力, 张其林, 王东方 2009 58 6616]
[15] [16] Yang J, Qie X S, Wang J G, Zhao Y, Zhang Q L, Yuan T, Zhou Y J, Feng G L 2008 Acta Phys. Sin. 57 1968 (in Chinese) [杨静, 郄秀书, 王建国, 赵阳, 张其林, 袁铁, 周筠珺, 冯桂力 2008 57 1968]
[17] [18] Morimoto T, Kawasaki Z I, Ushio T 2005 Atmos. Res. 76 445
[19] Shao X M, Rhodes C T, Holden D N 1999 J. Geophys. Res. 104 9601
[20] [21] Dong W S, Liu X S, Zhang Y J, Zhang G S 2002 Science in China D 32 81 (in Chinese) [董万胜, 刘欣生, 张义军, 张广庶 2002 中国科学 D 32 81]
[22] [23] [24] Yoshida S, Biagi C J, Rakov V A, Hill J D, Stapleton M V, Jor-dan D M, Uman M A, Morimoto T, Ushio T, Kawasaki Z I 2010 Geophys. Res. Lett. 37 L05805
[25] Shao X M, Krehbiel P R 1996 J. Geophys. Res. 101 26641
[26] [27] Akita M, Nakamura Y, Yoshida S, Morimoto T, Ushio T, Kawasaki Z, Wang D 2010 J. Geophys. Res. 115 D07106
[28] [29] Zhang G S, Wang Y H, Qie X S, Zhang T, Zhao Y X, Li Y J, Cao D J 2010 Science in China D 40 523 (in Chinese) [张广庶, 王彦辉, 郄秀书, 张彤, 赵玉祥, 李亚珺, 曹冬杰 2010 中国科学 D 40 523]
[30] [31] Zhang G S, Zhao Y X, Qie X S, Zhang T, Wang Y H, Chen C P 2008 Science in China D 38 1167 (in Chinese) [张广庶, 赵玉祥, 郄秀书, 张彤, 王彦辉, 陈成品 2008 中国科学 D 38 1167]
[32] [33] Mardiana R, Kawasaki Z I 2000 IEEE Trans. Instrum. Meas. 49 376
[34] [35] Mardiana R, Kawasaki Z I 2000 Geophys. Res. Lett. 27 2917
[36] [37] Proctor D E 1971 Geophys. Res. Lett. 76 1478
[38] [39] Taylor W L 1978 J. Geophys. Res. 83 3575
[40] [41] [42] Zhang Q, Qie X S, Zhang G S 2003 Plateau Meteorology 22 226 (in Chinese) [张泉, 郄秀书, 张广庶 2003 高原气象 22 226]
[43] [44] Qiu S, Zhou B H, Shi L H, Dong W S, Zhang Y J, Tao S C 2009 J. Geophys. Res. 114 D18211
[45] [46] Takahashi T 1978 J. Atmos. Sci. 35 1536
[47] [48] Williams E R 1989 J. Geophys. Res. 94 13151
[49] Kawasaki Z I, Mazur V 1992 J. Geophys. Res. 97 12935
[50] [51] Mazur V, Ruhnke L 1993 J. Geophys. Res. 98 12913
[52] [53] [54] Yuan P, Liu X S, Zhang Y J, Xie L Y, Dong C Z 2002 Acta Phys. Sin. 51 2495 (in Chinese) [袁萍, 刘欣生, 张义军, 颉录有, 董辰钟 2002 51 2495]
[55] Lan Y, Zhang Y J, Lv W T, Zheng D, Chen S D 2009 Plateau Me-teorology 28 05 (in Chinese) [蓝渝, 张义军, 吕伟涛, 郑栋, 陈绍东 2009 高原气象 28 05]
[56] [57] Rust W D, MacGorman D R, Bruning E C, Weiss S A, Krehbiel P R, Thomas R J, Rison W, Hamlin T, Harlin J 2005 Atmos. Res. 76 247
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