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18 March 2025 |
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Article overview
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Scaling of electron heating by magnetization during reconnection and applications to dipolarization fronts and super-hot solar flares | | M. Hasan Barbhuiya
; Paul. A. Cassak
; Michael. A. Shay
; Vadim Roytershteyn
; Marc Swisdak
; Amir Caspi
; Andrei Runov
; Haoming Liang
; | | Date: |
1 Aug 2022 | | Abstract: | Electron ring velocity space distributions have previously been seen in
numerical simulations of magnetic reconnection exhausts and have been suggested
to be caused by the magnetization of the electron outflow jet by the compressed
reconnected magnetic fields [Shuster et al., ${it Geophys.~Res.~Lett.}, {f
41}$, 5389 (2014)]. We present a theory of the dependence of the major and
minor radii of the ring distributions solely in terms of upstream (lobe) plasma
conditions, thereby allowing a prediction of the associated temperature and
temperature anisotropy of the rings in terms of upstream parameters. We test
the validity of the prediction using 2.5-dimensional particle-in-cell (PIC)
simulations with varying upstream plasma density and temperature, finding
excellent agreement between the predicted and simulated values. We confirm the
Shuster et al. suggestion for the cause of the ring distributions, and also
find that the ring distributions are located in a region marked by a plateau,
or shoulder, in the reconnected magnetic field profile. The predictions of the
temperature are consistent with observed electron temperatures in
dipolarization fronts, and may provide an explanation for the generation of
plasma with temperatures in the 10s of MK in super-hot solar flares. A possible
extension of the model to dayside reconnection is discussed. Since ring
distributions are known to excite whistler waves, the present results should be
useful for quantifying the generation of whistler waves in reconnection
exhausts. | | Source: | arXiv, 2208.00559 | | Services: | Forum | Review | PDF | Favorites | |
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