Observation of Inertial-range Energy Cascade within a Reconnection Jet in Earth's Magnetotail
| Autor: | Bandyopadhyay, Riddhi, Chasapis, Alexandros, Gershman, D. J., Giles, B. L., Russell, C. T., Strangeway, R. J., Contel, O. Le, Argall, M. R., Burch, J. L. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnrasl/slaa171 |
| Popis: | Earth's magnetotail region provides a unique environment to study plasma turbulence. We investigate the turbulence developed in an exhaust produced by magnetic reconnection at the terrestrial magnetotail region. Magnetic and velocity spectra show broad-band fluctuations corresponding to the inertial range, with Kolmorogov $-5/3$ scaling, indicative of a well developed turbulent cascade. We examine the mixed, third-order structure functions, and obtain a linear scaling in the inertial range. This linear scaling of the third-order structure functions implies a scale-invariant cascade of energy through the inertial range. A Politano-Pouquet third-order analysis gives an estimate of the incompressive energy transfer rate of $\sim 10^{7}~\mathrm{J\,kg^{-1}\,s^{-1}}$. This is four orders of magnitude higher than the values typically measured in 1 AU solar wind, suggesting that the turbulence cascade plays an important role as a pathway of energy dissipation during reconnection events in the tail region. Comment: Accepted for publication in MNRAS |
| Databáze: | arXiv |
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