Journal Club recent papers

cont.Ruilong Guo2014-09-29

symmetric component asymmetric component

模型和观测相符，电离层电流贡献不大

SYM-H主要产自越尾电流（其他和越尾重合）

非对称指数的贡献

The definition of compression region Sheath before an ICME.A typical coronal mass ejection (CME) trace seen in ACE OMNI data, with simultaneous increases in all components: interplanetary magnetic field (IMF) magnitude, solar wind (SW) speed, pressure, density, and temperature.”

The interplanetary sources ofthe other 334 magnetic storms are indeterminate because of data gaps (indicated here asIND-induced storms)

• the durations of the main and recovery phases anti-correlate for CIR- and Sheath-induced storms

• there is no dependence between them for (MC+Ejecta)-induced storms.

main

recovery phases

the best predictor is not necessarily the major driver of radiation belt dynamics.

between 40>X>80 RE.

mantle plasma flows tailward with substantial V|| speed from ~50 to 200km/s and at the same time drifts toward midnight and toward the current sheet with drift speed less than ~50% of the parallel speed.

Its density (~0.1–1cm-3 ) is about an order of magnitude lower than in the magnetosheath but is similar to that in the plasma sheet.

The temperature is similar to that in the magnetosheath but is lower than in the plasma sheet.

dawn-dusk asymmetries in the mantle appearance, with higher occurrence rates in the postmidnight (premidnight) sector above the current sheet when IMF By is positive (negative). Opposite dawn-dusk asymmetries are seen below the current sheet.

The occurrence rates, density, and V|| all decrease with decreasing |Y|. indicating that the magnetosheath plasma entering through the tail magnetopause along the open field line is an important source for the mantle plasma and the source likely exists continuously down the tail.

The large-amplitude electric fields may act as a dissipation mechanism and relax the highly tangled magnetic fields that result from the turbulence.

Furthermore, these observations offer strong support that Alfvénic Poynting flux from the BBF braking region can be the energy source for Alfvénic aurora.

Largest-amplitude electric fields, including double layers and electron phase-space holes, have a number features that including enhanced B fluctuations, magnetic field dipolarization, high ion flow velocities in arbitrary directions, variations in ion and electron temperatures, and strong, field-aligned detrended Poynting flux.

Bg=0

Bg=0.5B0

• PRIMARY ISLAND: There are multiple layers of the electric field in the primary island with and without guide field. • Electric field shows peaks in the inner and the outer regions, which is

provided by a combination of the Hall (dominant), the divergence of electron pressure tensor (∇ • Pe), and the convective terms.

• It is very small (~0) in the middle region due to the combination of the Hall term (mainly) and the convective term.

• It is small in the core region due to the combination of Hall term, ∇ • Pe term, and the convective term.

• SECOND ISLAND:• There is one single bipolar structure of electric field inside the

secondary island, which is primarily balanced by the Hall term, for zero guide field case, while there are multiple layers of the electric field in the secondary island for guide field case.

• As for guide field case, the electric field has one single sharp bipolar structure, similar to the case without guide field (the combination of the Hall (dominant), the convective, and the small ∇ • Pe terms) in the core region.

• Ez has two peaks in the outer region provided by the Hall term (dominant), the convective term, and ∇ • Pe term and a small value (~0) in the middle region due to the balance between the Hall terms and convective terms.