Artículos de revistas
Complexity of magnetic-field turbulence at reconnection exhausts in the solar wind at 1 au
Fecha
2021Registro en:
The Astrophysical Journal, 923:132 (11pp), 2021 December 20
10.3847/1538-4357/ac2dfe
Autor
Miranda, Rodrigo A.
Valdivia Hepp, Juan Alejandro
Chian, Abraham
Muñoz, Pablo R.
Institución
Resumen
Magnetic reconnection is a complex mechanism that converts magnetic energy into particle kinetic energy and
plasma thermal energy in space and astrophysical plasmas. In addition, magnetic reconnection and turbulence
appear to be intimately related in plasmas. We analyze the magnetic-field turbulence at the exhaust of four
reconnection events detected in the solar wind using the Jensen–Shannon complexity-entropy index. The
interplanetary magnetic field is decomposed into the LMN coordinates using the hybrid minimum variance
technique. The first event is characterized by an extended exhaust period that allows us to obtain the scaling
exponents of higher-order structure functions of magnetic-field fluctuations. By computing the complexity-entropy
index we demonstrate that a higher degree of intermittency is related to lower entropy and higher complexity in the
inertial subrange. We also compute the complexity-entropy index of three other reconnection exhaust events. For
all four events, the BL component of the magnetic field displays a lower degree of entropy and higher degree of
complexity than the BM and BN components. Our results show that coherent structures can be responsible for
decreasing entropy and increasing complexity within reconnection exhausts in magnetic-field turbulence.