J. H. Clemmons

High Latitude Thermosphere and Ionosphere Density Response to the May 2024 Geomagnetic Storm Observed by the LLITED CubeSat Mission

D. Swanson, J. H. Clemmons, Huixin Liu, Rebecca Bishop et autres

Abstract The May 2024 G5 geomagnetic storm produced significant disturbances in the ionosphere and thermosphere, particularly at high latitudes. Using high‐resolution in situ ion and neutral density measurements from the NASA Low‐Latitude Ionosphere/Thermosphere Enhancements in Density (LLITED) CubeSat at 430 km altitude, …

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Auroral electron acceleration by dispersive Alfvén waves – insights from the VISIONS-2 rocket mission

Etienne Gavazzi, Andres Spicher, Björn Gustavsson, J. H. Clemmons et autres

Alfvén waves with small perpendicular scale lengths are dispersive and can carry parallel electric fields. In the Earth's magnetosphere, they capture and accelerate electrons in a resonant process along the magnetic field lines down into the high-latitude ionosphere. These wave-particle interactions are …

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Open Questions on Ion–Neutral Collisions and Coupling in the Lower Thermosphere–Ionosphere: Electrodynamics, Energetics and Dynamics

T. E. Sarris, Stelios Tourgaidis, Dimitrios Baloukidis, Maxime Grandin et autres

Abstract The Lower Thermosphere–Ionosphere (LTI) is the interface region between the Earth’s atmosphere and space. It is modulated by the energy and momentum deposition from the magnetosphere above and by the impacting waves from the lower atmosphere. The LTI region is defined …

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Time-dependent modeling of Alfvénic precipitation observed in the ionosphere

Etienne Gavazzi, Andres Spicher, Björn Gustavsson, J. H. Clemmons et autres

Small scale dynamic auroras are generally related with dispersive Alfvén waves. Due to the short spatial and time scales involved, investigating the effects of this type of auroral precipitation on the ionosphere is challenging. In this study, we address this challenge by …

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Novel Ion Bernstein Waves Observed in the Polar Cap on the Endurance Sounding Rocket

A. W. Breneman, G. Collinson, R. F. Pfaff, A. Glocer et autres

Abstract The Endurance sounding rocket, launched in May 2022 at an altitude of 768 km, provided the first observations of plasma waves in the sunlit polar cap on a sounding rocket. Despite the quiet geomagnetic conditions required for the primary mission science, …

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Ultra‐Fast Measurements of Precipitating Electrons in Earth's Cusp—A Source of Flickering Aurora Near 1 R E

R. Michell, M. Samara, G. A. Grubbs, D. E. Rowland et autres

Abstract We present electron measurements from the Acute Precipitating Electron Spectrometer (APES) that flew on the VISualizing Ion Outflow via Neutral atom imaging during a Substorm‐2 (VISIONS‐2) sounding rocket which launched from Svalbard, Norway into dayside cusp aurora. APES measured the precipitating …

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The Relativistic Electron Magnetic Spectrometer (REMS) Instrument

Christine Gabrielse, D. L. Turner, William Chavez, William R. Crain et autres

Abstract As we move towards proliferated space and smaller, more cost-effective satellites, miniaturization of quality science instrumentation is becoming necessary and possible. This paper describes the Relativistic Electron Magnetic Spectrometer (REMS), a miniaturization of NASA’s Van Allen Probes’ MagEIS-Medium instrument, which was …

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Author Correction: Earth’s ambipolar electrostatic field and its role in ion escape to space

G. Collinson, A. Glocer, R. F. Pfaff, Aroh Barjatya et autres

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Time-dependent modeling of Alfvénic precipitation observed in the ionosphere

Etienne Gavazzi, Andres Spicher, Björn Gustavsson, J. H. Clemmons et autres

Abstract. Small scale dynamic auroras are generally related with dispersive Alfvén waves. Due to the short spatial and time scales involved, investigating the effects of this type of auroral precipitation on the ionosphere is challenging. In this study, we address this challenge …

no, us (code pays fourni par la source)

Supplementary material to "Time-dependent modeling of Alfvénic precipitation observed in the ionosphere"

Etienne Gavazzi, Andres Spicher, Björn Gustavsson, J. H. Clemmons et autres

Are we putting our best foot forward? The effect of insurance type on ankle fracture complications and delays in care: a retrospective two-year analysis

Nolan M Reinhart, Jackson P Tate, Chauncey A Bridges, J. H. Clemmons et autres

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The LLITED Mission’s Post-Launch Status & Lessons Learned

Rebecca Bishop, William Chavez, Darren Rowen, Aroh Barjatya et autres

The Low-Latitude Ionosphere/Thermosphere Enhancements in Density (LLITED) mission is a two 1.5U CubeSat mission to study nighttime ionosphere/thermosphere coupling. It successfully reached orbit in April 2023 and has completed early orbit commissioning. The two primary science payloads are successfully collecting science data …

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