Comparison of Very Low Frequency Wave Intensities Measured by a Low-Altitude Spacecraft and on the Ground

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10485206" target="_blank" >RIV/00216208:11320/24:10485206 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3yvQ2blGCY" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3yvQ2blGCY</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2024JA032655" target="_blank" >10.1029/2024JA032655</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Comparison of Very Low Frequency Wave Intensities Measured by a Low-Altitude Spacecraft and on the Ground

Popis výsledku v původním jazyce

We evaluate average wave intensities at frequencies up to 10 kHz measured by two ground stations in Canada and two others in Finland at auroral and subauroral latitudes over a full year, as well as by the low-altitude DEMETER spacecraft during the years 2004-2010. Lightning location and energy data obtained by the World Wide Lightning Location Network, along with geomagnetic activity characterized by the Kp index, are further used. Latitudinal, diurnal, and annual variations are analyzed, and the global intensities measured on the ground and by the spacecraft are systematically compared for the first time. We show that lightning-generated waves often dominate the measured wave intensities, particularly during the night, in summer, and at higher frequencies. DEMETER observations, supported by ray-tracing analysis, reveal a significant role of nonducted lightning-generated whistler propagation between the hemispheres. Finally, the wave intensity response to geomagnetic activity variations is quite different on the ground compared to in space. While spacecraft-measured wave intensities are considerably larger during periods of enhanced geomagnetic activity, the ground-based intensities are only sporadically enhanced during geomagnetically active periods. A global comparison of wave intensities measured by the DEMETER satellite and the Kannuslehto/PWING ground stations is performed Lightning-generated waves often dominate both DEMETER and ground observations, especially at night, in summer, and at higher frequencies Daytime intensities measured by DEMETER are larger during active periods, while on the ground they are only sporadically enhanced

Název v anglickém jazyce

Comparison of Very Low Frequency Wave Intensities Measured by a Low-Altitude Spacecraft and on the Ground

Popis výsledku anglicky

We evaluate average wave intensities at frequencies up to 10 kHz measured by two ground stations in Canada and two others in Finland at auroral and subauroral latitudes over a full year, as well as by the low-altitude DEMETER spacecraft during the years 2004-2010. Lightning location and energy data obtained by the World Wide Lightning Location Network, along with geomagnetic activity characterized by the Kp index, are further used. Latitudinal, diurnal, and annual variations are analyzed, and the global intensities measured on the ground and by the spacecraft are systematically compared for the first time. We show that lightning-generated waves often dominate the measured wave intensities, particularly during the night, in summer, and at higher frequencies. DEMETER observations, supported by ray-tracing analysis, reveal a significant role of nonducted lightning-generated whistler propagation between the hemispheres. Finally, the wave intensity response to geomagnetic activity variations is quite different on the ground compared to in space. While spacecraft-measured wave intensities are considerably larger during periods of enhanced geomagnetic activity, the ground-based intensities are only sporadically enhanced during geomagnetically active periods. A global comparison of wave intensities measured by the DEMETER satellite and the Kannuslehto/PWING ground stations is performed Lightning-generated waves often dominate both DEMETER and ground observations, especially at night, in summer, and at higher frequencies Daytime intensities measured by DEMETER are larger during active periods, while on the ground they are only sporadically enhanced

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA21-01813S" target="_blank" >GA21-01813S: Antropogenní elektromagnetické emise a jejich vliv na vnitřní magnetosféru Země</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geophysical Research. Space Physics

ISSN

2169-9380

e-ISSN

2169-9402

Svazek periodika

129

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

e2024JA032655

Kód UT WoS článku

001263098500001

EID výsledku v databázi Scopus

2-s2.0-85197687434