Search Publications
Search for Ultralight Dark Matter with a Frequency Adjustable Diamagnetic Levitated Sensor
Zhang, Liang; Li, Rui; Lin, Shaochun +3 more
Among several dark matter candidates, bosonic ultra-light (sub-meV) dark matter is well motivated because it could couple to the Standard Model and induce new forces. Previous MICROSCOPE and Eöt-Wash torsion experiments have achieved high accuracy in the sub-1 Hz region. However, at higher frequencies there is still a lack of relevant experimental…
Field-Aligned Electrons in Polar Region Observed by Cluster on 30 September 2001
Shi, Jian-Kui; Cheng, Zheng-Wei; Zhang, Zi-Ying +1 more
The physical process in the Earth's polar region is very complex and still needs to be further studied. Using the data from Cluster satellite measurement, an analysis on field-aligned electrons in the mid-latitude cusp on 30 September 2001 has been performed. The satellite observed a down-flowing electron event in the low-latitude boundary and a s…
Anomalous Resistivity Associated with Secondary Islands in the Reconnection Region
Zhou, Meng; Deng, Xiao-Hua; Su, Wei +1 more
We calculate the anomalous resistivity (AR) due to electrostatic waves, including possibly the lower hybrid wave and electron beam mode, around the secondary islands in the reconnection region observed by the Cluster spacecraft. Our main findings are: AR is important on the reconnection separatrix layer but heavily suppressed at the central curren…
Observation of a Sharp Negative Dipolarization Front in the Reconnection Outflow Region
Zhou, Meng; Deng, Xiao-Hua; Pang, Ye +1 more
A sharp dipolarization front (DF) has recently been detected in the Earth's magnetotail and is associated with complex kinetic effects. We present one event where a tailward propagating negative DF (with Bz decreasing sharply to negative value) was observed near a reconnection region. The thickness of the negative DF is comparable with …
Field-Aligned Currents at the PSBL on 17 August 2001 Storm: Relationships with solar Wind Conditions
Liu, Zhen-Xing; Shi, Jian-Kui; Cheng, Zheng-Wei +2 more
Using magnetic field and plasma data acquired with Cluster spacecrafts, we investigate the relationship between the field-aligned currents (FACs) at the plasma sheet boundary layer (PSBL) and solar wind dynamic pressure, as well as the interplanetary magnetic field (IMF) By on 17 August 2001 storm. Our studies reveal that FAC density at…
Clarification on Polarity of Bipolar Electric Field Solitary Structures in Space Plasmas with Satellite Observation
Liu, Zhen-Xing; Shi, Jian-Kui; Qureshi, M. N. S. +1 more
The bipolar electric field solitary (EFS) structures observed frequently in space plasmas by satellites have two different polarities, first positive electric field peak then negative (i.e., positive/negative) and first negative then positive peak (i.e., negative/positive). We provide the physical explanation on the polarity of observed bipolar EF…
Model of the Crustal Magnetic Field in the Martian Aurora Zone
Tong, Dong-Sheng; Chen, Chu-Xin
It is well known that aurorae are prominent on planets with a global magnetic field and occur where open magnetic field lines converge. The UV spectrometer used for investigating the characteristics of the atmosphere of Mars (SPICAM) on board the Mars Express made the first observation of auroral-type emission in the cusp region of the strong crus…
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS: Cluster Observation of Electrostatic Solitary Waves around Magnetic Null Point in Thin Current Sheet
Fu, Song; Zhou, Meng; Wang, Jing-Fang +5 more
Electrostatic solitary waves (ESWs) are observed in the vicinity of the magnetic null of the widely studied magnetic reconnection taking place at the near-earth tail when current sheet becomes dramatic thinning during substorm time on 1 October 2001. We use the Imada method for the 2-D reconnection model and study the characteristics of ESWs near …
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS: Is the Near-Earth Current Sheet Prior to Reconnection Unstable to Tearing Mode?
Cao, Jin-Bin; Fu, Hui-Shan; Wei, Xin-Hua +1 more
The tearing mode instability plays a key role in the triggering process of reconnection. The triggering collisionless tearing mode instability has been theoretically and numerically analyzed by many researchers. However, due to the difficulty in obtaining the observational wave number, it is still unknown whether the tearing mode instability can b…
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS: ULF Waves Associated with Solar Wind Deceleration in the Earth's Foreshock
Dandouras, I.; Lucek, E.; Rème, H. +3 more
Characteristics of ULF waves associated with the solar wind deceleration in the Earth's foreshock on 6-7 April 2003 is studied using the wave telescope technique. In the satellite frame, the ULF waves are the left-handed polarized and quasi anti-parallel propagating mode, with a power peak at about 18.63 mHz. The wave vector in the GSE coordinates…