Ionospheric Plasma Depletions at Mars Observed by the MAVEN Spacecraft

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10456695" target="_blank" >RIV/00216208:11320/22:10456695 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=kF1U1yfsUY" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=kF1U1yfsUY</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2022JE007302" target="_blank" >10.1029/2022JE007302</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ionospheric Plasma Depletions at Mars Observed by the MAVEN Spacecraft

Popis výsledku v původním jazyce

The Martian ionosphere, modulated by the solar wind from the topside and remnant crustal magnetic fields close to the surface, possesses unique structures different from Earth and Venus. Integrated observations by the plasma and magnetic field instruments onboard the Mars Atmosphere and Volatile Evolution spacecraft show evidence of ionospheric plasma depletions, independent of seasonal variations at Mars. During such depletions, the density of all ionospheric ion species is reduced by more than an order of magnitude, and, at the same time, the electron temperature increases abruptly. An automated algorithm for the identification of such plasma depletions is developed. Altogether, as many as 1,125 events are identified in 8,618 orbits available from October 2014 to May 2021. A statistical investigation of these events reveals that they are more prominent on the nightside, where they seem to occur primarily in the southern hemisphere, possibly in regions with strong crustal magnetic fields. While the dayside events occur mainly at altitudes above about 250 km, nightside event altitudes are typically lower. Considering the relation between spacecraft velocity and observed event duration, we suggest that the depletions are bubble-like structures, more elongated horizontally than vertically. A possible mechanism of their formation is discussed.

Název v anglickém jazyce

Ionospheric Plasma Depletions at Mars Observed by the MAVEN Spacecraft

Popis výsledku anglicky

The Martian ionosphere, modulated by the solar wind from the topside and remnant crustal magnetic fields close to the surface, possesses unique structures different from Earth and Venus. Integrated observations by the plasma and magnetic field instruments onboard the Mars Atmosphere and Volatile Evolution spacecraft show evidence of ionospheric plasma depletions, independent of seasonal variations at Mars. During such depletions, the density of all ionospheric ion species is reduced by more than an order of magnitude, and, at the same time, the electron temperature increases abruptly. An automated algorithm for the identification of such plasma depletions is developed. Altogether, as many as 1,125 events are identified in 8,618 orbits available from October 2014 to May 2021. A statistical investigation of these events reveals that they are more prominent on the nightside, where they seem to occur primarily in the southern hemisphere, possibly in regions with strong crustal magnetic fields. While the dayside events occur mainly at altitudes above about 250 km, nightside event altitudes are typically lower. Considering the relation between spacecraft velocity and observed event duration, we suggest that the depletions are bubble-like structures, more elongated horizontally than vertically. A possible mechanism of their formation is discussed.

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/LTAUSA17070" target="_blank" >LTAUSA17070: Elektromagnetické vlny v planetárních ionosférách a magnetosférách</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Journal of Geophysical Research. Planets

ISSN

2169-9097

e-ISSN

2169-9100

Svazek periodika

127

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

e2022JE007302

Kód UT WoS článku

000878453800001

EID výsledku v databázi Scopus

2-s2.0-85142912384