Search Publications
Nuclear structure and direct reaction studies in particle- γ coincidence experiments at the FSU John D. Fox superconducting linear accelerator laboratory
Spieker, Mark-Christoph; Almaraz-Calderon, Sergio
Since its foundation in the 1960s, the John D. Fox Superconducting Linear Accelerator Laboratory at Florida State University (FSU) pursued research at the forefront of nuclear science. In this contribution, we present recent highlights from nuclear structure and reaction studies conducted at the John D. Fox Superconducting Linear Accelerator Labor…
Effects from dayside magnetosphere to distant tail unleashed by a bifurcated, non-reconnecting interplanetary current sheet
Berchem, J.; Wing, S.; Farrugia, C. J. +6 more
Global magnetospheric effects resulting from the passage at Earth of large-scale structures have been well studied. The effects of common and short-term features, such as discontinuities and current sheets (CSs), have not been studied in the same depth. Herein we show how a seemingly unremarkable interplanetary feature can cause widespread effects…
Comparing Quasi-Parallel and Quasi-Perpendicular Configuration in the Terrestrial Magnetosheath: Multifractal Analysis
Sorriso-Valvo, Luca; Burgess, David; Yordanova, Emiliya +4 more
The terrestrial magnetosheath is characterized by large-amplitude magnetic field fluctuations. In some regions, and depending on the bow-shock geometry, these can be observed on several scales, and show the typical signatures of magnetohydrodynamic turbulence. Using Cluster data, magnetic field spectra and flatness are observed in two intervals se…
Data Mining Reconstruction of Magnetotail Reconnection and Implications for Its First-Principle Modeling
Sitnov, Mikhail; Stephens, Grant; Motoba, Tetsuo +1 more
Magnetic reconnection is a fundamental process providing topological changes of the magnetic field, reconfiguration of space plasmas and release of energy in key space weather phenomena, solar flares, coronal mass ejections and magnetospheric substorms. Its multiscale nature is difficult to study in observations because of their sparsity. Here we …
Concurrent empirical magnetic reconstruction of storm and substorm spatial scales using data mining and virtual spacecraft
Stephens, Grant K.; Sitnov, Mikhail I.
Data-mining (DM) has ushered in a new era of empirical magnetic reconstructions of the 4 magnetosphere via application of the k-nearest neighbors (kNN) method. In this approach, 5 the combined magnetosphere storm-substorm state is characterized by the Sym-H and AL IMF 6 indices, their time derivatives, and the solar wind electric field vBz . Howev…
Kelvin-Helmholtz Instability Associated with Reconnection and Ultra Low Frequency Waves at the Ground: A Case Study
Grigorenko, E. E.; Kronberg, E. A.; Nykyri, K. +7 more
The Kelvin-Helmholtz instability (KHI) and its effects relating to the transfer of energy and mass from the solar wind into the magnetosphere remain an important focus of magnetospheric physics. One such effect is the generation of Pc4-Pc5 ultra low frequency (ULF) waves (periods of 45-600 s). On 3 July 2007 at ~0500 magnetic local time the Cluste…
Using a Heliospheric Upwinding eXtrapolation (HUX) Technique to Magnetically Connect Different Regions of the Heliosphere
Riley, Pete; Issan, Opal
Understanding how coronal structure propagates and evolves from the Sun and into the heliosphere has been thoroughly explored using sophisticated MHD models. From these, we have a reasonably good working understanding of the dynamical processes that shape the formation and evolution of stream interaction regions and rarefactions, including their l…
Configuration of a Magnetic Cloud from Solar Orbiter and Wind Spacecraft In-situ Measurements
Zhao, Lingling; Hu, Qiang; He, Wen +1 more
Coronal mass ejections (CMEs) represent one type of the major eruption from the Sun. Their interplanetary counterparts, the interplanetary CMEs (ICMEs), are the direct manifestations of these structures when they propagate into the heliosphere and encounter one or more observing spacecraft. The ICMEs generally exhibit a set of distinctive signatur…
On the Origin of High–Frequency Magnetic Fluctuations in the Interplanetary Medium: A Brownian–like Approach
Vecchio, Antonio; Chiappetta, Federica; Lepreti, Fabio +2 more
Low–frequency fluctuations in the interplanetary medium have been extensively investigated and described in the framework of turbulence, and the observed universal scaling behavior represents a clear signature of the underlying energy cascade. On the contrary, the interpretation of observations of plasma fluctuations at high frequencies, where wav…
High-latitude cold ion outflow inferred from the Cluster wake observations in the magnetotail lobes and the polar cap region
André, Mats; Li, Kun; Wei, Yong +3 more
Cold ions with low (a few eV) thermal energies and also often low bulk drift energies, dominate the ion population in the Earth's magnetosphere. These ions mainly originate from the ionosphere. Here we concentrate on cold ions in the high latitude polar regions, where magnetic field lines are open and connected to the magnetotail. Outflow from the…