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27 Results Found

  • Article
  • Open Access
1,788 Views
9 Pages

The Electric Properties of the Magnetopause Boundary Layer

  • Lai Gao,
  • Chao Shen,
  • Yong Ji,
  • Yufei Zhou and
  • Yulia V. Bogdanova

The magnetopause plays a pivotal role in the coupling among solar wind, the magnetosheath, and the magnetosphere. By analyzing magnetopause crossing events using MMS, we reveal a local non-neutrality of electric charges in the magnetopause boundary l...

  • Article
  • Open Access
2 Citations
4,455 Views
15 Pages

1 November 2019

By means of the formation of vortices in the nonlinear phase, the Kelvin Helmholtz instability is able to redistribute the flux of energy of the solar wind that flows parallel to the magnetopause. The energy transport associated with the Kelvin Helmh...

  • Article
  • Open Access
1 Citations
2,349 Views
12 Pages

16 January 2024

Using data from the MESSENGER spacecraft magnetometer that describes the magnetopause and the bow shock crossing points of the Mercury’s magnetosphere, we have calculated the parameters of the paraboloids of revolution approximating the obtaine...

  • Communication
  • Open Access
1,647 Views
8 Pages

Excess of Sodium Ions Density Required to Create a Wide Current at the Hermean Magnetopause

  • Elena Belenkaya,
  • Ivan Pensionerov,
  • Igor Alexeev and
  • David Parunakian

23 September 2021

In this paper we consider an unusual structure, twice observed at the magnetopause of Mercury, and called the “Double Magnetopause”. Presumably, it is associated with a current sheet created by Na+ ions. Two alternative scenarios are considered. The...

  • Article
  • Open Access
2 Citations
2,102 Views
23 Pages

Magnetopause Detection under Low Solar Wind Density Based on Deep Learning

  • Yujie Zhang,
  • Tianran Sun,
  • Wenlong Niu,
  • Yihong Guo,
  • Song Yang,
  • Xiaodong Peng and
  • Zhen Yang

26 May 2023

Extracting the peak value of the X-ray signal in the original magnetopause detection method of soft X-ray imaging (SXI) for the SMILE satellite is problematic because of the unclear interface of the magnetosphere system under low solar wind density a...

  • Article
  • Open Access
2 Citations
1,491 Views
17 Pages

12 March 2024

Imaging has been an important strategy for exploring space weather. The Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) is a joint Chinese Academy of Sciences (CAS) and European Space Agency (ESA) mission, aiming at studying the interaction...

  • Article
  • Open Access
4 Citations
2,203 Views
11 Pages

The Relationship between Solar Wind Charge Exchange Soft X-ray Emission and the Tangent Direction of Magnetopause in an XMM–Newton Event

  • Yingjie Zhang,
  • Tianran Sun,
  • Jennifer A. Carter,
  • Wenhao Liu,
  • Steve Sembay,
  • Li Ji and
  • Chi Wang

With the advent of soft X-ray imaging enabling global magnetopause detection, it is critical to use reconstruction techniques to derive the 3-dimensional magnetopause location from 2-dimensional X-ray images. One of the important assumptions adopted...

  • Article
  • Open Access
3 Citations
1,994 Views
6 Pages

29 June 2021

On 14 January 2008, the MESSENGER spacecraft, during its first flyby around Mercury, recorded the magnetic field structure, which was later called the “double magnetopause”. The role of sodium ions penetrating into the Hermean magnetosphere from the...

  • Article
  • Open Access
3 Citations
2,654 Views
17 Pages

A Mechanism for Large-Amplitude Parallel Electrostatic Waves Observed at the Magnetopause

  • Gurbax Singh Lakhina,
  • Satyavir Singh,
  • Thekkeyil Sreeraj,
  • Selvaraj Devanandhan and
  • Rajith Rubia

1 June 2023

Large-amplitude electrostatic waves propagating parallel to the background magnetic field have been observed at the Earth’s magnetopause by the Magnetospheric Multiscale (MMS) spacecraft. These waves are observed in the region where there is an...

  • Article
  • Open Access
775 Views
23 Pages

9 July 2025

This study focuses on the problem of identifying and extracting the magnetopause boundary of the Earth’s magnetosphere using the Soft X-ray Imager (SXI) onboard the Solar Wind Magnetosphere Ionosphere Link Explorer (SMILE) mission. The SXI empl...

  • Article
  • Open Access
995 Views
16 Pages

11 October 2024

Flux transfer events (FTEs) are magnetic structures generally believed to originate from time-varying magnetic reconnection at the Earth’s magnetopause. Despite years of research, the mechanism of how FTEs are formed through reconnection remain...

  • Communication
  • Open Access
2,440 Views
7 Pages

31 January 2022

An astrophysical dynamo converts the kinetic energy of fluids into magnetic energy. Dynamo is a non-local process. Here, we consider whether a dynamo can operate at the magnetopauses of magnetic rapidly rotating planets. We analyze the main necessary...

  • Article
  • Open Access
13 Citations
4,361 Views
17 Pages

Evolution of Turbulence in the Kelvin–Helmholtz Instability in the Terrestrial Magnetopause

  • Francesca Di Mare,
  • Luca Sorriso-Valvo,
  • Alessandro Retinò,
  • Francesco Malara and
  • Hiroshi Hasegawa

18 September 2019

The dynamics occurring at the terrestrial magnetopause are investigated by using Geotail and THEMIS spacecraft data of magnetopause crossings during ongoing Kelvin–Helmholtz instability. Properties of plasma turbulence and intermittency are pre...

  • Article
  • Open Access
1 Citations
2,534 Views
11 Pages

26 March 2022

The Kelvin–Helmholtz (KH) instability, a common phenomenon widely observed at the magnetopause, plays an important role in plasma transport while reconnection at low latitude is less efficient during the northward interplanetary magnetic field...

  • Article
  • Open Access
2 Citations
969 Views
23 Pages

Automated Plasma Region Classification and Boundary Layer Identification Using Machine Learning

  • Jiye Wang,
  • Xuan Liu,
  • Fanzhuo Dai,
  • Rui Zheng,
  • Yuanlin Han,
  • Yang Wang,
  • Andi Liu,
  • Xinhua Wei,
  • Lingqian Zhang and
  • Wolfgang Baumjohann
  • + 4 authors

28 April 2025

The accurate classification of plasma regions is a critical challenge in space science, with identifying dynamic boundary layers (BLs) being particularly complex. This study introduces a novel wavelet-decision tree classifier (WDTC) designed to autom...

  • Article
  • Open Access
3 Citations
2,019 Views
16 Pages

Solar Wind Charge-Exchange X-ray Emissions from the O5+ Ions in the Earth’s Magnetosheath

  • Zhicheng Zhang,
  • Fei He,
  • Xiao-Xin Zhang,
  • Guiyun Liang,
  • Xueyi Wang and
  • Yong Wei

23 April 2024

The spectra and global distributions of the X-ray emissions generated by the solar wind charge-exchange (SWCX) process in the terrestrial magnetosheath are investigated based on a global hybrid model and a global geocoronal hydrogen model. Solar wind...

  • Essay
  • Open Access
5 Citations
3,771 Views
9 Pages

11 August 2022

A brief summary is given of an alternative interpretation of the Event Horizon Telescope observations of the massive black hole in the nucleus of the nearby galaxy M87. It is proposed that the flow is primarily powered by the black hole rotation, not...

  • Article
  • Open Access
8 Citations
3,188 Views
28 Pages

Results of Search for Magnetized Quark-Nugget Dark Matter from Radial Impacts on Earth

  • J. Pace VanDevender,
  • Robert G. Schmitt,
  • Niall McGinley,
  • David G. Duggan,
  • Seamus McGinty,
  • Aaron P. VanDevender,
  • Peter Wilson,
  • Deborah Dixon,
  • Helen Girard and
  • Jacquelyn McRae

21 April 2021

Magnetized quark nuggets (MQNs) are a recently proposed dark-matter candidate consistent with the Standard Model and with Tatsumi’s theory of quark-nugget cores in magnetars. Previous publications have covered their formation in the early universe, a...

  • Communication
  • Open Access
6 Citations
2,547 Views
8 Pages

Using a paraboloid model of an Earth-like exoplanetary magnetospheric magnetic field, developed from a model of the Earth, we investigate the magnetospheric structure of planets located in the habitable zone around G-type stars. Different directions...

  • Article
  • Open Access
3 Citations
4,875 Views
11 Pages

Design of Three-Dimensional Magnetic Probe System for Space Plasma Environment Research Facility (SPERF)

  • Jihua Yang,
  • Jiayin Xie,
  • Wenbin Ling,
  • Jian Guan,
  • Kai Huang,
  • Fupeng Chen,
  • Gaoyuan Peng,
  • Huibo Tang,
  • Hua Zhou and
  • Peng E

16 August 2024

A three-dimensional magnetic probe system has been designed and implemented at the Space Plasma Environment Research Facility (SPERF). This system has been developed to measure the magnetic field with high spatial and temporal resolution, enabling st...

  • Article
  • Open Access
2 Citations
2,232 Views
9 Pages

Sliding Contacts in Planetary Magnetospheres

  • Elena Belenkaya and
  • Igor Alexeev

7 February 2021

In the planetary magnetospheres there are specific places connected with velocity breakdown, reconnection, and dynamo processes. Here we pay attention to sliding layers. Sliding layers are formed in the ionosphere, on separatrix surfaces, at the magn...

  • Article
  • Open Access
7 Citations
3,988 Views
30 Pages

Limits on Magnetized Quark-Nugget Dark Matter from Episodic Natural Events

  • J. Pace VanDevender,
  • Aaron P. VanDevender,
  • Peter Wilson,
  • Benjamin F. Hammel and
  • Niall McGinley

4 February 2021

A quark nugget is a hypothetical dark-matter candidate composed of approximately equal numbers of up, down, and strange quarks. Most models of quark nuggets do not include effects of their intrinsic magnetic field. However, Tatsumi used a mathematica...

  • Article
  • Open Access
10 Citations
2,936 Views
19 Pages

Geoeffective magnetosheath plasma jets (those that interact with the magnetopause) are an important area of research and technology, since they affect the “space-weather” around the Earth. We identified such large-scale magnetosheath plasma jets with...

  • Article
  • Open Access
2,257 Views
32 Pages

Detection of Solar Neutrons and Solar Neutron Decay Protons

  • Yasushi Muraki,
  • Tatsumi Koi,
  • Satoshi Masuda,
  • Yutaka Matsubara,
  • Pedro Miranda,
  • Shoko Miyake,
  • Tsuguya Naito,
  • Ernesto Ortiz,
  • Akitoshi Oshima and
  • Kyoko Watanabe
  • + 5 authors

28 December 2023

Solar flares are broadly classified as impulsive or gradual. Ions accelerated in a gradual flare are thought to be accelerated through a shock acceleration mechanism, but the particle acceleration process in an impulsive flare is still largely unexpl...

  • Article
  • Open Access
12 Citations
2,455 Views
15 Pages

Atmospheric Effects of Magnetosheath Jets

  • Alexei V. Dmitriev and
  • Alla V. Suvorova

26 December 2022

We report effects in the upper high-latitude atmosphere related to the interaction of fast magnetosheath plasma streams, so-called jets, with the dayside magnetopause. The jets were observed by THEMIS mission in the dayside magnetosphere during a qui...

  • Article
  • Open Access
2,236 Views
14 Pages

The Phase Space Density Evolution of Radiation Belt Electrons under the Action of Solar Wind Dynamic Pressure

  • Peng Hu,
  • Haimeng Li,
  • Zhihai Ouyang,
  • Rongxin Tang,
  • Liangjin Song,
  • An Yuan,
  • Bopu Feng,
  • Yangyang Wang and
  • Wenqian Zou

Earth’s radiation belt and ring current are donut-shaped regions of energetic and relativistic particles, trapped by the geomagnetic field. The strengthened solar wind dynamic pressure (Pdyn) can alter the structure of the geomagnetic field, wh...

  • Article
  • Open Access
6 Citations
3,866 Views
15 Pages

Middle Latitude Geomagnetic Disturbances Caused by Hall and Pedersen Current Circuits Driven by Prompt Penetration Electric Fields

  • Takashi Kikuchi,
  • Kumiko K. Hashimoto,
  • Takashi Tanaka,
  • Yukitoshi Nishimura and
  • Tsutomu Nagatsuma

4 April 2022

The prompt penetration electric field (PPEF) drives the DP2 currents composed of the two-cell Hall current vortices surrounding the Region-1 field-aligned currents (R1FACs), and the zonal equatorial electrojet (EEJ, Cowling current) at the dayside eq...