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ionized upper atmosphere on 7 december 2023 using satellite auroral images and ground observations we showed how each stream disturbed the upper atmosphere their repeated impact strengthened these disturbances until a substorm began revealing how small events can build up to a larger magnetic disruption hide 25 sep 2026 mesoscale structure of flickering aurora from wide field high speed imaging sota nanjo satoshi kurita tima sergienko yoshizumi miyoshi and ryuho kataoka ann geophys 44 959 975 https doi org 10 5194 angeo 44 959 2026 https doi org 10 5194 angeo 44 959 2026 2026 short summary short summary using a high speed camera with a wide view of the sky we observed rapidly blinking aurora across several hundred kilometers we found that different parts of the same auroral arc can blink at different rhythms at the same time and that these rhythms move together with the arc although larger bright patches sometimes blink more slowly this pattern does not hold overall these results improve our understanding of how invisible space processes shape the visible northern lights hide 18 sep 2026 deducing spatial characteristics of global thunderstorm activity using the observed schumann resonance frequencies oleksandr koloskov masashi hayakawa and alexander p nickolaenko ann geophys 44 949 957 https doi org 10 5194 angeo 44 949 2026 https doi org 10 5194 angeo 44 949 2026 2026 short summary short summary to study global thunderstorm activity we analysed the schumann resonance electromagnetic field driven by lightning we developed formulas to calculate both the distance and the size of thunderstorm areas from frequency changes of either the magnetic or the electric resonance modes alone our method can be used by observatories worldwide which mainly record magnetic fields this novel technique improves our ability to monitor and understand global lightning activity hide 17 sep 2026 flying through the plasmasphere to optimize low energy ion measurements gabriella stenberg wieser martin wieser stas barabash philipp wittmann leif kalla markus fränz elias roussos audrey vorburger peter wurz jan erik wahlund pontus c brandt yoshifumi futaana manabu shimoyama angèle pontoni andré galli andreas riedo george ho donald g mitchell george clark peter kollmann malamati gkioulidou leonardo regoli norbert krupp robert wimmer schweingruber kazushi asamura esa kallio andrea opitz manuel grande andrew coates geraint jones theodoros sarris andrey fedorov nicolas andré and ján baláž ann geophys 44 937 948 https doi org 10 5194 angeo 44 937 2026 https doi org 10 5194 angeo 44 937 2026 2026 short summary short summary we used juice flyby of earth in august 2024 to evaluate the performance of the jovian plasma dynamics and composition analyzer jdc jdc measures positive and negative ions as well as electrons when juice arrives at jupiter one of the most challenging tasks for jdc is to record low energy ion populations we used the data jdc recorded close to earth together with measurement in the laboratory on ground to improve the future observations the sensor will make around jupiter s icy moons hide 15 sep 2026 non maxwellian electron distributions in the d region during artificial heating part 1 model development and electron temperature margaretha myrvang and björn gustavsson ann geophys 44 921 935 https doi org 10 5194 angeo 44 921 2026 https doi org 10 5194 angeo 44 921 2026 2026 short summary short summary this paper investigate how radio wave heating affect the electron distribution in the d region radio wave heating can lead to absorption of radio wave energy by electrons thereby increasing the temperature electrons are cooled by inelastic collisions with the neutrals atmosphere affecting the electron distribution since electrons lose energy by exciting different states in neutrals thus electrons are redistributed to lower energies which changes the shape of the electron distribution hide 14 sep 2026 electrodynamic reconfiguration of the polar ionosphere during the 2021 antarctic solar eclipse shibaji chakraborty sebastijan mrak alex chartier evan g thomas gareth chisham william bristow and aroh barjatya egusphere https doi org 10 5194 egusphere 2026 5257 https doi org 10 5194 egusphere 2026 5257 2026 preprint under review for angeo discussion open 0 comments short summary short summary we studied how the 2021 total solar eclipse over antarctica affected the upper atmosphere near the south pole using hf radars we observed changes in radio wave behavior and fast plasma flows in the ionosphere including sudden high velocity echoes that tracked the eclipse shadow satellite data and models revealed changes in ionospheric currents and conductance these findings show eclipses can temporarily reshape magnetosphere ionosphere interactions at polar latitudes hide 14 sep 2026 seasonal and local time patterns of vtec and dtec rms over hainan temporal and horizontal characteristics of winter and summer enhancements zheng wang yusen tian guangwei cao guojun wang guangyuan tan kai ding yajun zhu and xiao wang egusphere https doi org 10 5194 egusphere 2026 5242 https doi org 10 5194 egusphere 2026 5242 2026 preprint under review for angeo discussion open 0 comments short summary short summary six years of observations over hainan show that background plasma and short timescale ionospheric structure follow different seasonal and daily cycles winter disturbances strengthen during the afternoon and evolve over or pass through the region summer disturbances intensify near midnight but are concentrated in particular directions or areas revealing a more uneven horizontal distribution hide 04 sep 2026 estimating the source altitude of auroral precipitation from dispersed alfvén waves in the dayside ionosphere etienne gavazzi andres spicher björn gustavsson juha vierinen james clemmons robert pfaff and douglas rowland ann geophys 44 903 920 https doi org 10 5194 angeo 44 903 2026 https doi org 10 5194 angeo 44 903 2026 2026 short summary short summary auroras are caused by energetic electrons entering the upper atmosphere for the smallest and most dynamic auroras scientists think electrons are accelerated by waves called alfvén waves thousands of kilometers above earth in this paper we analyse data from a rocket that flew through auroras applying existing and new techniques to estimate where the acceleration took place our results match theory and we show how they can be used to study conditions in the near earth space environment hide 04 sep 2026 multifractal characterization of daily maximum and minimum ionospheric tec at african equatorial stations babatunde rabiu samuel ogunjo and ayomide olabode egusphere https doi org 10 5194 egusphere 2026 5194 https doi org 10 5194 egusphere 2026 5194 2026 preprint under review for angeo discussion open 0 comments short summary short summary the upper atmosphere over africa despite is importance in communication and navigation is poorly understood we studied the daily maximum and minimum of the total electron content above three african stations near the equator applying a technique that reveals hidden patterns across many timescales daytime values proved far more variable than nighttime ones reflecting how sunlight drives this activity the findings help improve forecasts of communication over africa hide 01 sep 2026 magnetotail response to corotating interaction region driven geomagnetic storms cluster observations adriane marques de souza franco rashmi rawat mauricio josé alves bolzan and ezequiel echer ann geophys 44 881 901 https doi org 10 5194 angeo 44 881 2026 https doi org 10 5194 angeo 44 881 2026 2026 short summary short summary this study investigates 40 geomagnetic storms driven by corotating interaction regions and their impact on earth s magnetotail we find that short 4 h energy pulses dominate the magnetotail during cyclic substorms furthermore high intensity long duration continuous auroral activity hildcaa events in the recovery phase facilitate energy distribution across 2 12 h periodicities in the auroral region spectral indices indicate strong turbulence in both regions hide 27 aug 2026 highlight paper dune aurora survey from a citizen science database maxime grandin liisa juusola noora partamies emma bruus joona rautiainen donna lach jia jia max van de kamp eero karvinen kirsti kauristie and theresa hoppe ann geophys 44 855 880 https doi org 10 5194 angeo 44 855 2026 https doi org 10 5194 angeo 44 855 2026 2026 short summary editorial statement short summary dune aurora is an intriguing phenomenon recently discovered thanks to citizen science it is a dim diffuse auroral form exhibiting wave like stripes of brighter emission we carry out the first statistical study of dune aurora using 308 observation reports submitted to the skywarden database by citizen scientists from europe north america and oceania we find that dunes are an evening phenomenon most often reported in march and october and associated with currents in the auroral atmosphere hide editorial statement dune aurora is a phenomenon which has only recently been reported in the scientific literature this paper builds upon the earlier reports of this phenomenon by presenting the first statistical study of dune aurora this work is interesting and valuable also because it draws on citizens observations and insights this will foster their interest in upper atmospheric phenomena at high latitudes as well as in the scientific interpretation of these phenomena and future research hide 26 aug 2026 post launch spectral and radiometric performances of majis the vis nir imaging spectrometer of juice yves langevin sébastien rodriguez sandrine guerlet françois poulet giuseppe piccioni livio agostini raymond armante emiliano d aversa gianrico filacchione leigh fletcher fabrizio oliva clément royer benoît seignovert katrin stephan federico tosi and tim trent ann geophys 44 825 853 https doi org 10 5194 angeo 44 825 2026 https doi org 10 5194 angeo 44 825 2026 2026 short summary short summary we present an updated spectral and radiometric calibration of the moons and jupiter imaging spectrometer majis aboard the jupiter icy moons explorer juice based on results of earth and moon observations in august 2024 and on observations of the majis internal calibration unit very good agreements were obtained with results of other instruments and models these majis observations provide a promising teaser of what will be achieved by majis in the system of jupiter hide 25 aug 2026 interaction between magnetic topology and plasma dynamics in the quasi steady solar wind magnetosphere system under obliquely northward imf conditions basic idea and magnetic field structure of the system shigeru fujita masakazu watanabe takashi tanaka and dong sheng cai egusphere https doi org 10 5194 egusphere 2026 3829 https doi org 10 5194 egusphere 2026 3829 2026 preprint under review for angeo discussion open 3 comments short summary short summary using results from global magnetohydrodynamic simulations we investigated the structure of the solar wind magnetosphere system from the perspective of the interaction between the force balance arising from plasma dynamics and the magnetic topology defined by the interplanetary magnetic field and the earth s dipole field we found that the structure of the magnetotail and the plasma sheet is strongly controlled by the magnetic topology hide 24 aug 2026 high latitude dayside rapid geomagnetic variations observed with ground based magnetometers in greenland marie vigger eldor magnar gullikstad johnsen nils olsen and anna naemi willer ann geophys 44 811 823 https doi org 10 5194 angeo 44 811 2026 https doi org 10 5194 angeo 44 811 2026 2026 short summary short summary rapid geomagnetic variations in the ultra low frequency band are observed using ground based magnetometers we apply four years of data from west greenland in a statistical analysis of the distribution of such variations we identify a rapid geomagnetic variation population associated with the magnetospheric cusp that is separate from the auroral oval during summer earlier studies which were mainly performed in winter failed to unambiguously identify these variations hide 21 aug 2026 juice swi during the lunar earth gravity assist lega part 3 observations of the earth as calibration target christopher jarchow ladislav rezac paul hartogh ali schulz ravanbakhsh thibault cavalié fabrice herpin raphael moreno and axel murk ann geophys 44 795 809 https doi org 10 5194 angeo 44 795 2026 https doi org 10 5194 angeo 44 795 2026 2026 short summary short summary the jupiter icy moons explorer is a spacecraft sent towards jupiter to perform detailed observations of the giant gas planet its galilean satellites the submillimetre wave instrument onboard this spacecraft is a newly built instrument which first of all has to demonstrate proper performance before the observed data can be trusted using the earth as a well known observation target proper functionality of this instrument has been verified during the lunar earth gravity assist in august 2024 hide 20 aug 2026 influence of solar solar wind and geomagnetic activity on the ionospheric propagation factor m 3000 f2 over ouagadougou in the african equatorial sector abdullahi kikelomo kazeem egusphere https doi org 10 5194 egusphere 2026 4526 https doi org 10 5194 egusphere 2026 4526 2026 revised manuscript under review for angeo discussion final response 6 comments short summary short summary this study examines how solar solar wind and geomagnetic activity influence the ionospheric propagation factor m 3000 f2 over ouagadougou using ionosonde observations the results reveal pronounced diurnal seasonal solar cycle and storm time variability with an inverse relationship between m 3000 f2 and solar activity f10 7 is identified as the dominant long term driver while geomagnetic storms significantly modify m 3000 f2 by altering f2 layer structure hide 19 aug 2026 storm time energy budget in the high latitude lower thermosphere ionosphere quantification of energy exchange and comparison of different drivers in tie gcm stelios tourgaidis theodoros sarris dimitrios baloukidis stephan buchert panagiotis pirnaris konstantinos papadakis and athanasios balafoutis ann geophys 44 773 793 https doi org 10 5194 angeo 44 773 2026 https doi org 10 5194 angeo 44 773 2026 2026 short summary short summary the lower thermosphere ionosphere energy balance is driven by complex interactions between ions neutrals and electrons these processes are understood theoretically but their estimates show large discrepancies between models we calculate the storm time energy budget according to the neutrals ions and electrons using tie gcm thermosphere ionosphere electrodynamics general circulation model using two different external drivers discrepancies between the model runs are discussed and the way forward to close the gaps in present knowledge is highlighted hide 18 aug 2026 ...