GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
|
|
|
|
Bounce-averaged Pitch-angle Diffusion by Electromagnetic Ion Cyclotron Waves in Multi-ion Plasmas |
XIAO Fu-Liang1,2, TIAN Tian3, CHEN Liang-Xu1 |
1$School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 4100042State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 1001903School of Earth and Space Sciences, Peking University, Beijing 100871 |
|
Cite this article: |
XIAO Fu-Liang, TIAN Tian, CHEN Liang-Xu 2009 Chin. Phys. Lett. 26 059402 |
|
|
Abstract We present a study on the gyroresonant interaction between electromagnetic ion cyclotron waves and ring current particles in multi-ion (H+, He+, and O+) plasmas. We provide a first evaluation of the bounce-averaged pitch angle diffusion coefficient <Dαα> for three typical energies of 50, 100 and 150keV at L≈3.5, the heart of the symmetrical ring current. We show that in the H+-band and He+-band, <Dαα> can approach ~10-4s-1 for ion H+, and ~5× 10-5s-1 for ion He+; meanwhile, in the O+-band, <Dαα> can reach ~10-5s-1 for ions He+ and O+. The results above show that the EMIC wave can efficiently produce precipitation loss of energetic (~100keV) ions (H+, He+ and even O+), and such a wave tends to be a serious candidate responsible for the ring current decay.
|
Keywords:
94.20.Rr
52.35.Hr
94.30.Lr
|
|
Received: 03 November 2008
Published: 23 April 2009
|
|
PACS: |
94.20.Rr
|
|
|
52.35.Hr
|
(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
|
|
94.30.Lr
|
(Magnetic storms, substorms)
|
|
|
|
|
[1] Lu Q M, Wang L Q, Zhou Y and Wang S 2004 Chin. Phys.Lett. 21 129 [2] Wang D Y, Huang G L and Lu Q M 2004 Chin. Phys.Lett. 21 1997 [3] Xiao F L, Zheng H N and Wang S 2005 Chin. Phys.Lett. 22 1552 [4] Xiao F L, Zheng H N and Wang S 2005 Chin. Phys.Lett. 22 517 [5] Xiao F L, Zhou Q H, Zheng H N and Wang S 2006 J.Geophys. Res. 111 A08208 [6] Xiao F L, Thorne R M and Summers D 2007 Planet.Space Sci. 55 1257 [7] Xiao F L, Chen L J, Zheng H N and Wang S 2007 J.Geophys. Res. 112 A10214 [8] Baker D N, Blake J B, Klebesadel R W and Higbie P R 1986 J. Geophys. Res. 91 4265 [9] Li X 2004 Space Weather 2 S03006 [10] Li L, Cao J and Zhou G 2005 J. Geophys. Res. 110 A03203 [11] Zong Q-G, Zhou X-Z, Li X, Song P, Fu S Y, Baker D N,Pu Z Y, Fritz T A, Daly P, Balogh A and Re\'me H 2007 Geophys. Res. Lett. 34 L12105 [12] Zong Q-G, Wang Y F, Yang B, Fu S Y, Pu Z Y, Xie L andFritz T A 2008 Sci. China Ser E-Technol. Sci. 51 1 [13] Cornwall J M, Coroniti F V and Thorne R M 1970 J.Geophys. Res. 75 4699 [14] Xiao F L, Chen L X, He H Y and Zhou Q H 2008 Chin.Phys. Lett. 25 336 [15] He H Y, Chen L X and Li J F 2008 Chin. Phys. Lett. 25 3511 [16] Jordanova V K, Kozyra J U and Nagy A F 1996 J.Geophys. Res. 101 19771 [17] Summers D and Thorne R M 2003 J. Geophys. Res. 108 1143 [18] Glauert S A and Horne R B 2005 J. Geophys. Res. 110 A04206 [19] Lyons L R, Thorne R M and Kennel C F 1972 J.Geophys. Res. 77 3455 [20] Summers D 2005 J. Geophys. Res. 110 A08213 [21] Summers D, Ni B and Meredith N P 2007 J. Geophys.Res. 112 A04207 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|