Tomoko Matsuo

Science case for the Magnetospheric Auroral Asymmetry eXplorer: observing the aurora to uncover how energy flows in space

M. W. Liemohn, Aaron J. Ridley, Daniel T. Welling, Alexa J. Halford et autres

The Magnetospheric Auroral Asymmetry eXplorer (MAAX) mission concept would make a major leap forward in determining how magnetosphere-ionosphere electrodynamic coupling regulates multi-scale auroral energy flow through the near-Earth space environment. Recently proposed to NASA’s Heliophysics Small Explorer program, MAAX would accomplish this …

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Validation of Global Ionospheric Specification (GIS) Electron Density Measurements During Solar Minimum to Solar Maximum Under Quiet and Disturbed Geomagnetic Conditions

P. K. Rajesh, C. H. Charles Lin, Tomoko Matsuo, Hidekatsu Jin et autres

Abstract Global Ionospheric Specification (GIS) three‐dimensional electron density profiles constructed by assimilating the line‐of‐sight total electron content (TEC) from global navigation satellite system (GNSS) radio occultation (RO) measurements by FORMOSAT‐7/COSMIC‐2 (F7/C2) and ground‐based receiver network from international GNSS service, constitute a unique …

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Modeling large nonstationary spatial data with the full-scale basis graphical lasso

William Kleiber, Tomoko Matsuo

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A new approach to inversion of multi-spectral data with applications to FUV remote sensing

Matthew LeDuc, Tomoko Matsuo, William Kleiber

Abstract. Many atmospheric measurement techniques involve inversion of photon counts detected by multi-spectral sensors spanning the X-ray to microwave regions of the electromagnetic spectrum. Although photon counts follow Poisson statistics, commonly used inversion techniques often rely on statistical assumptions that disregard the …

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Quantifying Storm-Time Neutral Density Uncertainties using a Physics-Based Particle Filter Framework

Nicholas Dietrich, Tomoko Matsuo

Abstract Forecasting orbit positions in the low Earth orbit (LEO) environment is necessary for avoiding collisions, which is particularly difficult during geomagnetic storms due to highly variable neutral mass density and the associated uncertainty on atmospheric drag. Orbit position errors are commonly …

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Improving E-region Neutral Wind Variability in Numerical Models Using LEO Magnetometer Data

Astrid Maute, Tomoko Matsuo, Vaneeza Rupani, Chuan-Ping Lien et autres

The strongest ionospheric currents flow in general in the E‑region (~90-135 km) due to the high conductivities produced by dayside ionization. The solar quiet (Sq) current system arises from neutral winds pushing plasma across Earth’s magnetic field, generating electric fields and ionospheric …

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Comment on egusphere-2025-5570

Matthew LeDuc, Tomoko Matsuo, William Kleiber

Abstract. Many atmospheric measurement techniques involve inversion of photon counts detected by multi-spectral sensors spanning the X-ray to microwave regions of the electromagnetic spectrum. Although photon counts follow Poisson statistics, commonly used inversion techniques often rely on statistical assumptions that disregard the …

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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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Comment on egusphere-2025-5570

Matthew LeDuc, Tomoko Matsuo, William Kleiber

Abstract. Many atmospheric measurement techniques involve inversion of photon counts detected by multi-spectral sensors spanning the X-ray to microwave regions of the electromagnetic spectrum. Although photon counts follow Poisson statistics, commonly used inversion techniques often rely on statistical assumptions that disregard the …

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Comment on egusphere-2025-5570

Matthew LeDuc, Tomoko Matsuo, William Kleiber

Abstract. Many atmospheric measurement techniques involve inversion of photon counts detected by multi-spectral sensors spanning the X-ray to microwave regions of the electromagnetic spectrum. Although photon counts follow Poisson statistics, commonly used inversion techniques often rely on statistical assumptions that disregard the …

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Challenges for ionosphere-thermosphere science

Maria‐Theresia Walach, Mai Mai Lam, David R. Themens, A. L. Aruliah et autres

Abstract Report on the RAS Specialist Discussion Meeting about one of the grand challenges for Earth system scientists

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Equivalent Kernel Method for FUV Inversion Problems: Applications to NASA GOLD Disk Emission Data

Matthew LeDuc, Tomoko Matsuo, William Kleiber

Over the past decades far-ultraviolet (FUV) remote sensing has played a key role in advancing heliophysics by providing valuable measurements of space plasmas and neutral species. However, current inversion techniques for retrieval of physical parameters such as neutral composition and temperature and …

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