Intensity of nightside MARSIS AIS surface reflections and implications for low-altitude ionospheric densities

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10319443" target="_blank" >RIV/00216208:11320/15:10319443 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/2014JA020888" target="_blank" >http://dx.doi.org/10.1002/2014JA020888</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2014JA020888" target="_blank" >10.1002/2014JA020888</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Intensity of nightside MARSIS AIS surface reflections and implications for low-altitude ionospheric densities

Popis výsledku v původním jazyce

Spacecraft radar sounding signals at frequencies higher than the ionospheric peak plasma frequency are not reflected by the ionosphere. Instead, they make it to the ground where they are reflected by the planetary surface. We analyze the intensity of thesurface reflections measured by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) ionospheric radar sounder on board the Mars Express spacecraft. Apart from the surface reflectivity and the spacecraft altitude, the detected intensity of surface reflections is controlled primarily by the signal attenuation during the ionospheric propagation. We focus on the nightside region, where the ionospheric densities in the main layer are too low to cause a significant attenuation and allow sampling of the surface reflections at frequencies down to 3MHz. The attenuation occurs mainly at altitudes below 100km, where the electron-neutral collision frequency is a maximum. The intensity of surface reflections can thus serve as a

Název v anglickém jazyce

Intensity of nightside MARSIS AIS surface reflections and implications for low-altitude ionospheric densities

Popis výsledku anglicky

Spacecraft radar sounding signals at frequencies higher than the ionospheric peak plasma frequency are not reflected by the ionosphere. Instead, they make it to the ground where they are reflected by the planetary surface. We analyze the intensity of thesurface reflections measured by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) ionospheric radar sounder on board the Mars Express spacecraft. Apart from the surface reflectivity and the spacecraft altitude, the detected intensity of surface reflections is controlled primarily by the signal attenuation during the ionospheric propagation. We focus on the nightside region, where the ionospheric densities in the main layer are too low to cause a significant attenuation and allow sampling of the surface reflections at frequencies down to 3MHz. The attenuation occurs mainly at altitudes below 100km, where the electron-neutral collision frequency is a maximum. The intensity of surface reflections can thus serve as a

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

—

Projekt

<a href="/cs/project/LH13031" target="_blank" >LH13031: Ionosféra Marsu: Radarová pozorování družicí Mars Express</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

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

—

Svazek periodika

120

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

3226-3239

Kód UT WoS článku

000354894800062

EID výsledku v databázi Scopus

2-s2.0-84929619798