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Detailed Reference Information |
Panov, E.V., Büchner, J., Fränz, M., Korth, A., Savin, S.P., Fornaçon, K.-H., Dandouras, I. and Rème, H. (2006). CLUSTER observation of collisionless transport at the magnetopause. Geophysical Research Letters 33: doi: 10.1029/2006GL026556. issn: 0094-8276. |
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On May 10, 2002 the CLUSTER spacecraft (SC) encountered a ~450 km (five magnetosheath thermal proton gyro-radii) wide high-latitude magnetopause (MP). Magnetic field observations indicate the crossing of a ~130 km thick MP current sheet (CS) located inside a magnetic hole. Proton flux measurements diagnose a dense boundary layer (BL) directly attached to the MP and an additional rare BL located earthwards from the MP. Enhanced magnetic fluctuations are found near the local proton-cyclotron frequency Ωcp (0.4--2 Hz). Applying the phase-differencing technique we obtained a wavelength of 150--250 km and the propagating direction earthward perpendicular to the MP. Inside the MP the pitch-angle proton distribution demonstrates the presence of a transverse population. The formation of the two BLs can be understood by enhanced collisionless diffusion of magnetosheath protons due to wave-particle interaction, while higher-energy protons (Wp > 300 eV) penetrate into the BLs also via finite gyro-radius effect. |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Interplanetary Physics, Ejecta, driver gases, and magnetic clouds, Interplanetary Physics, Plasma waves and turbulence, Magnetospheric Physics, Magnetopause and boundary layers, Magnetospheric Physics, Planetary magnetospheres (5443, 5737, 6033), Magnetospheric Physics, Plasma waves and instabilities |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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