Determination of vertical profiles of shell currents in the ionosphere

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00618396" target="_blank" >RIV/67985815:_____/25:00618396 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0365405" target="_blank" >https://hdl.handle.net/11104/0365405</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/angeo-43-193-2025" target="_blank" >10.5194/angeo-43-193-2025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Determination of vertical profiles of shell currents in the ionosphere

Popis výsledku v původním jazyce

In previous works, we found Euler potentials for the combined magnetic field of Earth's dipole, field-aligned currents, ring current, and the magnetopause surface currents (represented by Dungey's term) in the magnetosphere. Field-aligned currents, also known as Birkeland currents, experience closure in the ionosphere through the shell current patterns, also known as Pedersen and Cowley currents. Field-aligned currents can be measured at an altitude of around 800 km and can be reconstructed in the entire magnetosphere by means of tracing along the magnetic-field lines. The determination of shell currents is more difficult. They can only be measured in the ionosphere because they form a closure of field-aligned currents in the ionosphere. Analytical modeling and numerical modeling of the shell currents are not easy tasks and require knowledge of the conductivity tensor in the ionosphere. We propose an alternative approach for shell current modeling. In this paper, we determine the current density distribution in a finite-thickness ionosphere. Our system consists of the ionosphere, a region above it (outer region), and a region below it (inner region). The dipole field is present in the entire system. In addition, there is a field generated by the field-aligned currents in the outer region. We search for a continuation of these currents into the ionosphere, that is, for shell currents.

Název v anglickém jazyce

Determination of vertical profiles of shell currents in the ionosphere

Popis výsledku anglicky

In previous works, we found Euler potentials for the combined magnetic field of Earth's dipole, field-aligned currents, ring current, and the magnetopause surface currents (represented by Dungey's term) in the magnetosphere. Field-aligned currents, also known as Birkeland currents, experience closure in the ionosphere through the shell current patterns, also known as Pedersen and Cowley currents. Field-aligned currents can be measured at an altitude of around 800 km and can be reconstructed in the entire magnetosphere by means of tracing along the magnetic-field lines. The determination of shell currents is more difficult. They can only be measured in the ionosphere because they form a closure of field-aligned currents in the ionosphere. Analytical modeling and numerical modeling of the shell currents are not easy tasks and require knowledge of the conductivity tensor in the ionosphere. We propose an alternative approach for shell current modeling. In this paper, we determine the current density distribution in a finite-thickness ionosphere. Our system consists of the ionosphere, a region above it (outer region), and a region below it (inner region). The dipole field is present in the entire system. In addition, there is a field generated by the field-aligned currents in the outer region. We search for a continuation of these currents into the ionosphere, that is, for shell currents.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA21-26463S" target="_blank" >GA21-26463S: Procesy na magnetopauze, jejich příčiny a následky</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Annales Geophysicae

ISSN

0992-7689

e-ISSN

1432-0576

Svazek periodika

43

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

8

Strana od-do

193-200

Kód UT WoS článku

001446584700001

EID výsledku v databázi Scopus

2-s2.0-105000449553