In this section
@article{Shi:2019:10.1029/2019ja026582,
author = {Shi, J and Zhang, Z and Torkar, K and Cheng, Z and Escoubet, P and Farzakeley, A and Dunlop, M and Carr, C},
doi = {10.1029/2019ja026582},
journal = {Journal of Geophysical Research: Space Physics},
pages = {5342--5352},
title = {SouthNorth Hemispheric Asymmetry of the FAE Distribution Around the Cusp Region: Cluster Observation},
url = {http://dx.doi.org/10.1029/2019ja026582},
volume = {124},
year = {2019}
}
TY - JOUR
AB - Cluster data from late July to early October were used to study the distribution of fieldaligned electron (FAE) events around the two cusps. An FAE event was defined as electron parallel flux >3 × 108 (cm2 s)−1. The total number of FAE events around the two cusps was basically identical, but downward FAE events prevailed in the south and upward FAE events in the north. In the southern cusp, the peak of the FAE events distribution versus altitude was about 1.3 RE higher and the peak of the FAE events distribution versus invariant latitude (ILAT) was about 4° ILAT lower. Only the downward FAEs around the southern cusp had a second ILAT peak, which was located about 11° higher than the main peak. The normalized number of FAEs showed nearly the same features as the unnormalized number of the FAEs events. These results indicated a northsouth asymmetry of the FAE distribution around the two cusps. Some causes for the asymmetry are discussed, the main ones being the asymmetry of the magnetospheric configuration resulting from geomagnetic dipolar tilt and solar wind flows, the interplanetary magnetic field asymmetry related to the magnetosphere, and the difference of ionospheric conductivity in the two hemispheres. Various solar windmagnetosphere interaction processes, such as quasiviscous interaction and reconnection, are responsible for the asymmetry, too. The second distribution peak (at higher ILAT) of the downward FAE events around the southern cusp corresponded to high solar wind speed and may be associated with the northward interplanetary magnetic field Bz fieldaligned current at low altitude. This requires further studies, however.
AU - Shi,J
AU - Zhang,Z
AU - Torkar,K
AU - Cheng,Z
AU - Escoubet,P
AU - Farzakeley,A
AU - Dunlop,M
AU - Carr,C
DO - 10.1029/2019ja026582
EP - 5352
PY - 2019///
SN - 2169-9380
SP - 5342
TI - SouthNorth Hemispheric Asymmetry of the FAE Distribution Around the Cusp Region: Cluster Observation
T2 - Journal of Geophysical Research: Space Physics
UR - http://dx.doi.org/10.1029/2019ja026582
UR - https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JA026582
UR - http://hdl.handle.net/10044/1/72058
VL - 124
ER -