Back to Search Start Over

Conjunction Observations of Energetic Oxygen Ions O+ Accumulated in the Sequential Flux Ropes in the High‐Altitude Cusp.

Authors :
Duan, Suping
Dai, Lei
Wang, Chi
Cai, Chunlin
He, Zhaohai
Zhang, Yongcun
Reme, H.
Dandouras, I.
Source :
Journal of Geophysical Research. Space Physics; Oct2019, Vol. 124 Issue 10, p7912-7922, 11p
Publication Year :
2019

Abstract

Conjunction observations of the magnetic field and plasma by Cluster and TC‐1 at the dayside magnetosphere are presented to investigate the sequential flux ropes transferred from the low latitude boundary layer to the high‐altitude cusp on 10 March 2004.Three sequential flux ropes originating from the dayside low latitude magnetopause are first detected by TC‐1. After ~5.3 min, three sequential flux ropes accumulated with energetic oxygen ions are also detected by Cluster in the high‐altitude cusp. The recurrence period of these flux ropes is ~3 min. The number density of energetic oxygen ions in the cusp flux rope is ~0.25 cm−3 detected from CIS/CODF instrument on Cluster. It is found that oxygen ions with energy lager than 10 keV have a narrow pitch angle (less than 90°) distribution in the southern high‐altitude cusp. While oxygen ions with energy less than 10 keV are distributed in a wide pitch angle from 0 to 180°. Counter‐streaming energetic oxygen ions are found in these flux ropes in the high‐altitude cusp.This result suggests that the oxygen ions with energy less than 10 keV in the high‐altitude cusp have two source regions. One is from the dayside magnetopause, and the other is from the low‐altitude cusp. Our investigations first provide evidence that flux ropes at dayside low‐latitude magnetopause can carry energetic oxygen ions into the high‐altitude cusp region. Key Points: Counter‐streaming oxygen ions are observed in the flux ropes in the cuspEnergetic oxygen ions accumulated within sequential flux ropes in the high‐altitude cuspConjunction observations first present sequential flux ropes can carry energetic oxygen ions from the dayside LLBL to the high‐altitude cusp [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
21699380
Volume :
124
Issue :
10
Database :
Complementary Index
Journal :
Journal of Geophysical Research. Space Physics
Publication Type :
Academic Journal
Accession number :
139786586
Full Text :
https://doi.org/10.1029/2019JA026989