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Annales Geophysicae
Scopus
ISSN 0992-7689 · Copernicus Publications · 5.408 artikel di indeks
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Observations of fragmented aurora-like emissions and picket fence on the poleward edge of the auroral oval
We analyzed fragmented auroral-like emissions (FAEs) and picket fence structures observed in northern Scandinavia during a magnetic storm on 1 January 2025. The analysis is based on ground-based high-sensitivity optical observations and in-situ measurements from the Swarm satellites. While FAEs and…
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Plasma density estimation from ionograms and geophysical parameters with deep learning
Accurate estimates of the ionospheric electron density are essential for various space-weather applications but are challenging at high latitudes due to strong spatial and temporal variability driven by auroral precipitation and complex ionospheric convection. This study presents an assimilative…
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Solar wind driving of the auroral outflow during the 23–26 September 1998 storm
Data from the FAST spacecraft are used to study the temporal progression of the energy inputs to the dayside cusp and the nightside aurora, including Poynting flux, electron number flux and amplitude of extremely low frequency (ELF) waves, during a storm driven by CME (Coronal Mass Ejections), and…
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ESA/JUICE encounters Earth/Moon in 2024: overview of the Moons And Jupiter Imaging Spectrometer (MAJIS) observations
The Lunar-Earth Gravitational Assist (LEGA) of 19–20 August 2024 marked the first in-flight opportunity beyond functional checks to perform MAJIS (Moons and Jupiter Imaging Spectrometer) observations on-board the ESA's Jupiter Icy Moons Explorer (JUICE) spacecraft. This unique double flyby involved…
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Variability and trend analysis of temperature and height in the upper troposphere and stratosphere region over the tropics (Réunion), by combining balloon-sonde and satellite measurements
Tropopause height and temperature play a crucial role in atmospheric chemistry and radiative forcing and serve as key indicators of anthropogenic climate change. However, accurately determining this parameter requires advanced remote sensing techniques. This study compares tropopause height and…
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Effect of Ionospheric Variability on the Electron Energy Spectrum estimated from Incoherent Scatter Radar Measurements
The ion composition in the E-region is modified by auroral precipitation. This affects the inversion of electron density profiles from field-aligned incoherent scatter radar measurements to differential energy spectra of precipitating electrons. Here a fully dynamic ionospheric chemistry model…
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Earth's magnetosheath: a comparison of plasma flow direction between models and observations
Observations of the plasma flow direction in the Earth's magnetosheath are compared with the help of three analytical magnetic-field models, namely Kobel and Flückiger (1994), Romashets and Vandas (2019), and Vandas and Romashets (2019), which all assume current-free fields in the magnetosheath. 47…
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A source or a sink? How the altitude of particle precipitation influence high-latitude electrodynamics
From the sum total dissipation of unstable wave energy in geospace, a frequent and efficient channel of dissipation is opened up by particle precipitation. The phenomenon, which is part of a complicated cascade of unstable magnetohydrodynamic wave modes, consists of charged particles that…
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Data reduction of incoherent scatter plasma line parameters
In the ionosphere, a sustained population of suprathermal electrons arises due to photoionization or electron precipitation. The presence of such a population enhances the scattered power in the plasma line spectrum, thus making it possible to detect them. Plasma line measurements improve the…
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Ionospheric currents and auroral signatures during successive earthward bursty bulk flows and dipolarization: a 7 December 2023 case study
Earthward bursty bulk flows (BBFs) in the central plasma sheet are frequently accompanied by dipolarization fronts, and together they account for a large fraction of the energy and momentum transported from the magnetotail to the high-latitude ionosphere through field-aligned currents (FACs). On 7…
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Mesoscale structure of flickering aurora from wide-field high-speed imaging
We report wide-field observations of flickering aurora obtained with a fast sCMOS camera and a diagonal fisheye lens at Poker Flat Research Range, Alaska, on 8 February 2016. The system recorded 512×512 pixel images at 80 Hz, enabling us to investigate the mesoscale organization of flickering along…
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High-latitude auroral and cloudiness occurrence from automatic image classification
We have investigated auroral and cloudiness occurrence over Kjell Henriksen Observatory (KHO) in Svalbard using full-colour all-sky images from 2016–2025. Our approach focused on constructing a high-quality manually labelled training set, in which images were classified as ClearAurora…
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Deducing spatial characteristics of global thunderstorm activity using the observed Schumann resonance frequencies
The paper addresses a new methodology of studying the global Schumann Resonance, an electromagnetic phenomenon driven by thunderstorms worldwide. We present a new concept and derive formulae for the simultaneous assessment of the effective source–observer distance- and the spatial extent of the…
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Flying through the plasmasphere to optimize low-energy ion measurements
The Juice flyby of Earth in August 2024 gave us the first chance to evaluate the performance of the Jovian Plasma Dynamics and Composition analyzer (JDC) in environments similar to those expected at Jupiter. JDC is one of the sensors belonging to the Particle Environment Package (PEP) on the Juice…
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Pre-earthquake Electric Field Disturbances and Interference Analysis Based on CSES-01 Satellite Observations
Anomalous electromagnetic phenomena in the ionosphere before seismic activity have been identified as potential indicators for earthquake early warning. Data from the CSES-01 satellite were analyzed using the STL decomposition method to break down electric field time series into longitudinal…
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The JUICE 2024 close flyby of the Moon: thermal assessment from MAJIS
We present an analysis of four mid-infrared observations of the lunar surface acquired by the MAJIS instrument during the Jupiter Icy Moons Explorer (JUICE) gravity assist in August 2024. The data span 0.49–5.56 µm at sub-kilometre spatial resolution. These data provide a rare opportunity to…
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Juice-SWI during the Lunar-Earth-Gravity-Assist (LEGA) – Part 2: Instrument operations
The Jupiter Icy Moons Explorer (Juice) embarked in 2023 on a 8-year interplanetary journey to Jupiter and its icy moons. The Submillimetre Wave Instrument (SWI) is one of the ten science instruments aboard the spacecraft. SWI is a sophisticated and first-of-its-kind payload visiting the outer solar…
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New technique for isolating the auroral contribution in UV imagery: IMF By dependence of seasonal differences in auroral oval location during positive IMF Bz
We investigate how the location, size, and intensity of the auroral oval is affected by the combination of the tilt of the Earth's magnetic dipole axis and a strong, stable dawn/dusk component of the interplanetary magnetic field (IMF By) during northward IMF. Sunlit auroral observations are…
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Spectroscopic detection of terrestrial lightning from space by JUICE-MAJIS during Earth Gravity Assist
A lightning event was detected by the MAJIS imaging spectrometer onboard the Jupiter Icy Moons Explorer (JUICE) spacecraft during its first Earth gravity assist maneuver. This serendipitous observation represents the first space-based spectroscopic measurement of lightning for any planetary…
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Non-Maxwellian electron distributions in the D region during artificial heating – Part 1: Model development and electron temperature
The phase space density in the weakly ionized D region is calculated by numerically solving the Boltzmann equation and through a Monte Carlo simulation for high power, high frequency radio wave heating under the assumption that the electron collision frequency is much larger than the…
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