Radial and latitudinal variations of the energetic particle response to ICMEs

2006 ◽  
pp. 309-319 ◽  
Author(s):  
David Lario
Keyword(s):  
Energetic Particle ◽  
Latitudinal Variations

On the morphology of auroral absorption during substorms

1970 ◽  
Vol 48 (3) ◽  
pp. 335-345 ◽  
Author(s):  
Doris H. Jelly
Keyword(s):  
Radio Wave ◽  
Energetic Particle ◽  
Auroral Zone ◽  
Electron Precipitation ◽  
Magnetic Disturbance ◽  
Energy Component ◽  
Radio Wave Absorption ◽  
Intense Absorption ◽  
Latitudinal Variations ◽  
A Chain

Multistation riometer measurements of ionospheric radio-wave absorption have been used to infer the characteristics of the higher-energy component of electron precipitation during substorms. Two analyses are presented which deal separately with longitudinal and latitudinal variations. The first is based on data from four riometer stations located at L ≈ 5.2 and at about 90° longitude intervals, and the second on a chain of five riometer stations spaced at about 3° intervals across the auroral zone. Previous work has shown that substorms detected at night are accompanied by daytime precipitation. In the present study, the average substorm absorption is found to have two broad maxima, one at night within 15 min of the absorption onset, and another during the morning about an hour after this onset. There is very little effect in the evening.From the latitude study, a transition is observed during the nighttime phase of substorms between the abrupt, irregular, intense absorption at higher latitudes and the smoother, less intense absorption at lower latitudes. This transition, designated as Λa, is observed at a median latitude of Λa = 65 ± 1.5°. For the majority of a sample of 181 events selected from 1964 and 1967 records, the absorption was observed to start in the vicinity of Λa. With increased magnetic disturbance (measured by Kp), Λa is observed to shift to lower latitudes. The Kp variation is compared with that of energetic-particle boundaries.

scholarly journals Unusual enhancement of ~ 30 MeV proton flux in an ICME sheath region

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Mitsuo Oka ◽  
Takahiro Obara ◽  
Nariaki V. Nitta ◽  
Seiji Yashiro ◽  
Daikou Shiota ◽  
...  
Keyword(s):  
Shock Front ◽  
Energetic Particle ◽  
Leading Edge ◽  
Solar Energetic Particle ◽  
Interplanetary Shock ◽  
Proton Event ◽  
Sheath Region ◽  
Time Profiles ◽  
Energetic Particle Flux ◽  
Mev Protons

AbstractIn gradual Solar Energetic Particle (SEP) events, shock waves driven by coronal mass ejections (CMEs) play a major role in accelerating particles, and the energetic particle flux enhances substantially when the shock front passes by the observer. Such enhancements are historically referred to as Energetic Storm Particle (ESP) events, but it remains unclear why ESP time profiles vary significantly from event to event. In some cases, energetic protons are not even clearly associated with shocks. Here, we report an unusual, short-duration proton event detected on 5 June 2011 in the compressed sheath region bounded by an interplanetary shock and the leading edge of the interplanetary CME (or ICME) that was driving the shock. While < 10 MeV protons were detected already at the shock front, the higher-energy (> 30 MeV) protons were detected about four hours after the shock arrival, apparently correlated with a turbulent magnetic cavity embedded in the ICME sheath region.

scholarly journals Precession drift reversal and rapid transport of trapped energetic particles due to an energetic particle driven instability in the Large Helical Device

2021 ◽  
Vol 28 (8) ◽  
pp. 080701
Author(s):  
M. Idouakass ◽  
Y. Todo ◽  
H. Wang ◽  
J. Wang ◽  
R. Seki ◽  
...  
Keyword(s):  
Energetic Particle ◽  
Energetic Particles ◽  
Rapid Transport

scholarly journals Probing the energetic particle environment near the Sun

Nature ◽  
2019 ◽  
Vol 576 (7786) ◽  
pp. 223-227 ◽  
Author(s):  
D. J. McComas ◽  
E. R. Christian ◽  
C. M. S. Cohen ◽  
A. C. Cummings ◽  
A. J. Davis ◽  
...  
Keyword(s):  
Energetic Particle ◽  
The Sun

Design and Realization of China Tianwen-1 Energetic Particle Analyzer

2021 ◽  
Vol 217 (2) ◽  
Author(s):  
Cunhui Li ◽  
Shuwen Tang ◽  
Xiangyu Hu ◽  
Yi Qian ◽  
Yi Wang ◽  
...  
Keyword(s):  
Energetic Particle
Sign in / Sign up

Export Citation Format

Share Document