A5078103144- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Geophysical and Geoelectrical Methods
- Electromagnetic Compatibility and Measurements
- Energy Harvesting in Wireless Networks
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
Imperial College London
2019-2022
The presence of horse-collar auroras (HCAs) during northward interplanetary magnetic field periods offers opportunities to study unique dynamics in the Earth’s high-latitude magnetosphere. Horse-collar have been linked closure polar cap and dual lobe reconnection, which also results dayside terrestrial field. However, this reconnection event has not observed situ. On 14 April 2007, Defense Meteorological Satellite Program (DMSP) orbiter F17 ultraviolet imager (SSUSI) spectrometer...
Magnetospheric substorms are among the most dynamic phenomena in Earth’s magnetosphere, yet their triggering mechanisms remain unclear. Ground-based observations have identified auroral beads as precursors to substorms. Here, we report a new precursor feature space-based kilometric radiation (AKR), marked by appearance of emissions with slowly frequency-drifting tones (
Abstract Ganymede is the only Solar System moon known to generate a permanent magnetic field. Jovian plasma motions around create an upstream magnetopause, where energy flows are thought be driven by reconnection. Simulations indicate Ganymedean reconnection events may transient, but nature of magnetopause at remains poorly understood, requiring assessment onset theory. We present analytical model steady‐state conditions Ganymede's from which first conducted. find that occur wherever closed...
Abstract Ganymede is the only Solar System moon that generates a permanent magnetic field. Dynamics within Ganymedean magnetosphere thought to be driven by energy‐transfer interactions on its upstream magnetopause. Previously in Kaweeyanun et al. (2020), https://doi.org/10.1029/2019GL086228 we created steady‐state analytical model of Ganymede's magnetopause and predicted global‐scale reconnection occur frequently throughout surface. This paper subsequently provides first assessment...
Transpolar arcs (TPAs) are extensions of auroral emission poleward beyond the main ovals, forming partial or complete bisections known as ‘theta’ auroras. A prominent hypothesis suggests that a TPA occurs through stagnation magneto-plasma returning from Earth’s magnetotail under northward interplanetary magnetic field (IMF), resulting in ‘wedge’ closed lines open polar cap on which particles resemble those nightside equatorial plasma sheet....
Permanently magnetic Ganymede carves a distinct magnetosphere inside Jupiter’s larger domain, confined by ambient Jovian plasma and field along the upstream magnetopause. As traverses sheet, magnetoplasma conditions vary at half-synodic period (5.27 hr), leading to same-period oscillation in Chapman-Ferraro (C-F) produced We assess C-F as unique excitation source for Ganymede’s subsurface ocean. The magnetopause is shown diffuse into but not through ocean, causing induction provided liquid...
Ganymede is the only Solar System moon known to generate a permanent magnetic field. Jovian plasma motions around create an upstream magnetopause, where energy flows are thought be driven by reconnection. Simulations indicate Ganymedean reconnection events may transient, but nature of magnetopause at remains poorly understood, requiring assessment onset theory. We present analytical model steady-state conditions Ganymede’s from which first conducted. find that occur wherever closed field...
<p>Ganymede is the largest moon of Jupiter and only Solar System known to generate a permanent magnetic field. Motions Jupiter’s magnetospheric plasma around Ganymede create an upstream magnetopause, where energy flows are thought be driven by reconnection and/or Kelvin-Helmholtz Instability (KHI). Previous numerical simulations indicate evidence for transient events KHI wave structures, but natures both processes remain poorly understood. Here we present...
Earth and Space Science Open Archive This work was has been accepted for publication in Geophysical Research Letters. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing an older version [v2]Go to new versionFavorable Conditions Magnetic Reconnection at Ganymede's Upstream MagnetopauseAuthors Nawapat Kaweeyanun iD Adam Masters Xianzhe Jia See all authors...
Ganymede is the only Solar System moon that generates a permanent magnetic field. Dynamics inside Ganymede’s magnetosphere likely driven by energy-transfer interactions on its upstream magnetopause. Previously in Kaweeyanun et al. (2020), we created steady-state analytical model of magnetopause and predicted global-scale reconnection to occur frequently throughout surface. Using same model, this paper provides first assessment Kelvin-Helmholtz (K-H) instability growth isolation from effects....
Earth and Space Science Open Archive This work has been accepted for publication in Geophysical Research Letters. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v3]Favorable Conditions Magnetic Reconnection at Ganymede's Upstream MagnetopauseAuthors Nawapat Kaweeyanun iD Adam Masters Xianzhe Jia See all authors...
<p>The permanent magnetic field of Jupiter’s moon Ganymede is thought to arise from an Earth-like dynamo in the moon’s outer core, alongside a secondary time varying induced by convection subsurface ocean. Magnetic fields Jupiter and meet along current boundary known as upstream magnetopause, whose location depends on delicate pressure balance presence plasma-magnetic interactions including reconnection. As traverses Jovian plasma sheet, magnetopause...