Electron Precipitation Observed by ELFIN Using Proton Precipitation as a Proxy for Electromagnetic Ion Cyclotron (EMIC) Waves

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F23%3A00578650" target="_blank" >RIV/68378289:_____/23:00578650 - isvavai.cz</a>

Výsledek na webu

<a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL103519" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL103519</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2023GL103519" target="_blank" >10.1029/2023GL103519</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electron Precipitation Observed by ELFIN Using Proton Precipitation as a Proxy for Electromagnetic Ion Cyclotron (EMIC) Waves

Popis výsledku v původním jazyce

Electromagnetic ion cyclotron (EMIC) waves can drive radiation belt depletion and Low-Earth Orbit satellites can detect the resulting electron and proton precipitation. The ELFIN (Electron Losses and Fields InvestigatioN) CubeSats provide an excellent opportunity to study the properties of EMIC-driven electron precipitation with much higher energy and pitch-angle resolution than previously allowed. We collect EMIC-driven electron precipitation events from ELFIN observations and use POES (Polar Orbiting Environmental Satellites) to search for 10s-100s keV proton precipitation nearby as a proxy of EMIC wave activity. Electron precipitation mainly occurs on localized radial scales (similar to 0.3 L), over 15-24 MLT and 5-8 L shells, stronger at similar to MeV energies and weaker down to similar to 100-200 keV. Additionally, the observed loss cone pitch-angle distribution agrees with quasilinear predictions at greater than or similar to 250 keV (more filled loss cone with increasing energy), while additional mechanisms are needed to explain the observed low-energy precipitation.

Název v anglickém jazyce

Electron Precipitation Observed by ELFIN Using Proton Precipitation as a Proxy for Electromagnetic Ion Cyclotron (EMIC) Waves

Popis výsledku anglicky

Electromagnetic ion cyclotron (EMIC) waves can drive radiation belt depletion and Low-Earth Orbit satellites can detect the resulting electron and proton precipitation. The ELFIN (Electron Losses and Fields InvestigatioN) CubeSats provide an excellent opportunity to study the properties of EMIC-driven electron precipitation with much higher energy and pitch-angle resolution than previously allowed. We collect EMIC-driven electron precipitation events from ELFIN observations and use POES (Polar Orbiting Environmental Satellites) to search for 10s-100s keV proton precipitation nearby as a proxy of EMIC wave activity. Electron precipitation mainly occurs on localized radial scales (similar to 0.3 L), over 15-24 MLT and 5-8 L shells, stronger at similar to MeV energies and weaker down to similar to 100-200 keV. Additionally, the observed loss cone pitch-angle distribution agrees with quasilinear predictions at greater than or similar to 250 keV (more filled loss cone with increasing energy), while additional mechanisms are needed to explain the observed low-energy precipitation.

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

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Geophysical Research Letters

ISSN

0094-8276

e-ISSN

1944-8007

Svazek periodika

50

Číslo periodika v rámci svazku

21

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

e2023GL103519

Kód UT WoS článku

001091632500001

EID výsledku v databázi Scopus

2-s2.0-85175843596