Search Publications
Observations of Small-Scale Magnetic Flux Ropes Associated With Significant Values of Partial Variance Increment Indices
Hu, Qiang; Chen, Yu
We report recent findings for the magnetic field configurations of small-scale magnetic flux ropes (SFRs) broadly defined and identified by using the Grad-Shafranov-based techniques for in situ measurements via the Parker Solar Probe (PSP), Solar Orbiter (SolO), and two Helios spacecraft. Since the current sheets were found to occur at boundaries …
VLF Transmitter Signals Observed by the Cluster Spacecraft Over a Wide Range of Latitudes
Santolík, O.; Němec, F.; Albert, J. M.
Very low frequency transmitter signals can penetrate through the ionosphere and propagate in the inner magnetosphere, being observed by spacecraft instruments with sufficient frequency resolution and range. We use 23 years of measurements performed by the Waves of High frequency and Sounder for Probing of Electron density by Relaxation instrument …
Venus' O 5577 Å Oxygen Green Line: A Global Diffuse Proton-Induced Aurora
Tellmann, Silvia; Pätzold, Martin; Peter, Kerstin +5 more
The Venusian O(1S–1D) 5577 Å "oxygen green line" has been an enigmatic feature of the Venusian atmosphere since its first attempted observation by the Venera spacecraft. Its first detection in 1999 and subsequent detections point to a unique auroral phenomena. However, the lack of (1D–3P) 6300 Å "oxygen …
Spectral Structures of Jovian Broadband Kilometric Radiation Revealed by Cassini and Juno
Kurth, W. S.; Píša, D.; Fischer, G. +2 more
Cassini flew past Jupiter in 2000/2001, and Juno has been orbiting the gas giant since mid-2016. Here we focus on the spectral properties of Jovian broadband kilometric radiation (bKOM), and we classified them according to their slope in the time–frequency spectrum and distinguish four categories with negative, positive, mixed, or no slope in freq…
Solar Wind Current Sheets: MVA Inaccuracy and Recommended Single-Spacecraft Methodology
Wang, R.; Phan, T. D.; Mozer, F. S. +1 more
We present the analysis of 1,831 current sheets (CS) observed aboard four Cluster spacecraft in a pristine solar wind. Four-spacecraft estimates of the CS normal and propagation velocity are compared with different single-spacecraft estimates. The Minimum Variance Analysis (MVA) of the magnetic field is shown to be highly inaccurate in estimating …
New Chorus Diffusion Coefficients for Radiation Belt Modeling
Meredith, Nigel P.; Wong, Jin-Mann; Horne, Richard B. +2 more
Whistler mode chorus is an important magnetospheric wave emission playing a major role in radiation belt dynamics, where it contributes to both the acceleration and loss of relativistic electrons. In this study we compute bounce and drift averaged chorus diffusion coefficients for 3.0 < L* < 6.0, using the TS04 external magnetic field model,…
Storm-Time Very-Near-Earth Magnetotail Reconnection: A Statistical Perspective
Angelopoulos, V.; Beyene, F.
The ring current, an equatorial near-Earth current, fluctuates in response to solar wind plasma interactions with Earth's magnetosphere. Despite extensive research on storm-time ring current energization, direct evidence of the energy transport into the inner-magnetosphere that powers this current remains scarce. Recent observations revealing that…
Key Factors Determining Nightside Energetic Electron Losses Driven by Whistler-Mode Waves
Ma, Qianli; Zhang, Xiao-Jia; Agapitov, Oleksiy +4 more
Energetic electron losses by pitch-angle scattering and precipitation to the atmosphere from the radiation belts are controlled, to a great extent, by resonant wave particle interactions with whistler-mode waves. The efficacy of such precipitation is primarily modulated by wave intensity, although its relative importance, compared to other wave an…
Spacecraft Outgassing Observed by the BepiColombo Ion Spectrometers
André, N.; Cornet, T.; Orsini, S. +19 more
During the first flyby of the BepiColombo composite spacecraft at Mercury in October 2021 ion spectrometers observed two intense spectral lines with energies between 10 and 70 eV. The spectral lines persisted also at larger distances from Mercury and were observed again at lower intensity during cruise phase in March 2022 and at the second and thi…
Reconnection Inside a Dipolarization Front of a Diverging Earthward Fast Flow
Escoubet, C. P.; Fazakerley, A. N.; Le Contel, O. +18 more
We examine a Dipolarization Front (DF) event with an embedded electron diffusion region (EDR), observed by the Magnetospheric Multiscale (MMS) spacecraft on 08 September 2018 at 14:51:30 UT in the Earth's magnetotail by applying multi-scale multipoint analysis methods. In order to study the large-scale context of this DF, we use conjunction observ…