Observational evidence of accelerating electron holes and their effects on passing ions

Autor: Yue Dong, Zhigang Yuan, Shiyong Huang, Zuxiang Xue, Xiongdong Yu, C. J. Pollock, R. B. Torbert, J. L. Burch

Publikováno v: Nature Communications, Vol 14, Iss 1, Pp 1-7 (2023)

Abstract As a universal structure in space plasma, electron holes represent an obvious signature of nonlinear process. Although the theory has a 60-year history, whether electron hole can finally accelerate ambient electrons (or ions) is quite contro

Externí odkaz: https://doaj.org/article/f630d0011ee24586819520302bb5f28a

Direct observations of energy transfer from resonant electrons to whistler-mode waves in magnetosheath of Earth

Autor: N. Kitamura, T. Amano, Y. Omura, S. A. Boardsen, D. J. Gershman, Y. Miyoshi, M. Kitahara, Y. Katoh, H. Kojima, S. Nakamura, M. Shoji, Y. Saito, S. Yokota, B. L. Giles, W. R. Paterson, C. J. Pollock, A. C. Barrie, D. G. Skeberdis, S. Kreisler, O. Le Contel, C. T. Russell, R. J. Strangeway, P.-A. Lindqvist, R. E. Ergun, R. B. Torbert, J. L. Burch

Publikováno v: Nature Communications, Vol 13, Iss 1, Pp 1-12 (2022)

Excitation of whistler-mode waves by cyclotron instability is considered as the likely generation process of the waves. Here, the authors show direct observational evidence for locally ongoing secular energy transfer from the resonant electrons to th

Externí odkaz: https://doaj.org/article/ad624c4396ec4f62824af55a223f9b45

Ion Behavior at Shocklets: A Case Study of MMS Observations

Autor: Z.‐Y. Liu, Q.‐G. Zong, H. Zhang, J.‐T. Zhao, R. Rankin, C. J. Pollock, G. Le

Publikováno v: Geophysical Research Letters, Vol 49, Iss 17, Pp n/a-n/a (2022)

Abstract The existence of shocklets, a kind of solitary structure, has been demonstrated in the Earth's foreshock regions for decades. Their formation and evolution are believed to be controlled by ions. However, the detailed behavior of ions at them

Externí odkaz: https://doaj.org/article/64604d42e77d43d8b3a3611544f1a65d

Bifurcated Current Sheet Observed on the Boundary of Kelvin-Helmholtz Vortices

Autor: K-J. Hwang, K. Dokgo, E. Choi, J. L. Burch, D. G. Sibeck, B. L. Giles, C. Norgren, T. K. M. Nakamura, D. B. Graham, Y. Khotyaintsev, Q. Q. Shi, D. J. Gershman, C. J. Pollock, R. E. Ergun, R. B. Torbert, C. T. Russell, R. J. Strangeway

Publikováno v: Frontiers in Astronomy and Space Sciences, Vol 8 (2021)

On May 5, 2017 MMS observed a bifurcated current sheet at the boundary of Kelvin-Helmholtz vortices (KHVs) developed on the dawnside tailward magnetopause. We use the event to enhance our understanding of the formation and structure of asymmetric cur

Externí odkaz: https://doaj.org/article/5c38dee24eaf41a4935ec566bbfd45d5

A first look at the SMACS0723 JWST ERO:spectroscopic redshifts, stellar masses, and star-formation histories

Autor: A C Carnall, R Begley, D J McLeod, M L Hamadouche, C T Donnan, R J McLure, J S Dunlop, B Milvang-Jensen, C L Bondestam, F Cullen, S M Jewell, C L Pollock

Publikováno v: Carnall, A C, Begley, R, McLeod, D J, Hamadouche, M L, Donnan, C T, McLure, R J, Dunlop, J S, Milvang-Jensen, B, Bondestam, C L, Cullen, F, Jewell, S M & Pollock, C L 2023, ' A first look at the SMACS0723 JWST ERO : spectroscopic redshifts, stellar masses, and star-formation histories ', Monthly Notices of the Royal Astronomical Society, vol. 518, no. 1, pp. L45-L50 . https://doi.org/10.1093/mnrasl/slac136
Carnall, A C, Begley, R, McLeod, D J, Hamadouche, M L, Donnan, C T, McLure, R J, Dunlop, J S, Milvang-Jensen, B, Bondestam, C L, Cullen, F, Jewell, S M & Pollock, C L 2023, ' A first look at the SMACS0723 JWST ERO: spectroscopic redshifts, stellar masses, and star-formation histories ', Monthly Notices of the Royal Astronomical Society, vol. 518, no. 1, pp. L45-L50 . https://doi.org/10.1093/mnrasl/slac136

We present a first-look analysis of the JWST ERO data in the SMACS J0723.3-7327 cluster field. We begin by reporting 10 new spectroscopic redshifts from $\lambda_\mathrm{obs}=1.8-5.2\mu$m NIRSpec medium-resolution ($R=\lambda/\Delta\lambda = 1000$) d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::78fe17f6e4f061ec23103c3c70e241b6
https://curis.ku.dk/ws/files/338299587/slac136.pdf