scholarly journals Effects of different geomagnetic storm drivers on the ring current: CRCM results

2013 ◽  
Vol 118 (3) ◽  
pp. 1062-1073 ◽  
Author(s):  
W.D. Cramer ◽  
N.E. Turner ◽  
M.-C. Fok ◽  
N.Y. Buzulukova
Keyword(s):  
Geomagnetic Storm ◽  
Ring Current

scholarly journals Simulation study of the energetic neutral atom (ENA) imaging monitoring of the geomagnetosphere on a lunar base

2021 ◽  
Vol 7 (3) ◽  
pp. 3-11
Author(s):  
Lu Li ◽  
Yu Qing-Long ◽  
Zhou Ping ◽  
Zhang Xin ◽  
Zhang Xian-Guo ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Ring Current ◽  
Sampling Interval ◽  
Base Station ◽  
Radiation Environment ◽  
Emission Model ◽  
The Moon ◽  
Imaging Data ◽  
Particle Radiation ◽  
Energy Channel

Since the moon’s revolution cycle is exactly the same as its rotation cycle, we can only see the moon always facing Earth in the same direction. Based on the clean particle radiation environment of the moon, a neutral atomic telemetry base station could be established on the lunar surface facing Earth to realize long-term continuous geomagnetic activity monitoring. Using the 20°×20° field of view, the 0.5°×0.5° angle resolution, and the ~0.17 cm²sr geometric factor, a two-dimensional ENA imager is being designed. The magnetospheric ring current simulation at a 4–20 keV energy channel for a medium geomagnetic storm (Kp=5) shows the following: 1) at ~60 Rᴇ (Rᴇ is the Earth radius), the imager can collect 10⁴ ENA events for 3 min to meet the statistical requirements for 2D coded imaging data inversion, so as to meet requirements for the analysis of the substorm ring current evolution process of magnetic storms above medium; 2) the ENA radiation loss puzzles in the magnetopause and magnetotail plasma sheet regions have been deduced and revealed using the 2-D ENA emission model. High spatial-temporal resolution ENA imaging monitoring of these two important regions will provide the measurement basis for the solar wind energy input process and generation mechanism; 3) the average sampling interval of ENA particle events is about 16 ms at the moon’s orbit; the spectral time difference for the set energy range is on the order of minutes, which can provide location information to track the trigger of geomagnetic storm particle events.

PROBLEMS OF THE OUTER RADIATION BELT FORMATION AND TOPOLOGICAL FEATURES OF HIGH LATITUDE MAGNETOSPHERE

2021 ◽  
Vol 44 ◽  
pp. 7-11
Author(s):  
Elena Antonova ◽  
Keyword(s):  
Geomagnetic Storm ◽  
High Latitude ◽  
Radiation Belt ◽  
Ring Current ◽  
Outer Part ◽  
Auroral Oval ◽  
Plasma Pressure ◽  
Relativistic Electrons ◽  
Outer Radiation Belt ◽  
Topological Features

We analyzed the problems of formation of the outer radiation belt (ORB) taking into consideration the latest changes in our understanding of the high-latitude magnetospheric topology. This includes strong evidence that the auroral oval maps to the outer part of the ring current, meanwhile the ORB polar boundary maps inside the auroral oval. Our analysis also includes the variation of the plasma pressure distribution and the time of the acceleration of relativistic electrons during geomagnetic storm. It is shown that the maximum of ORB is formed after the geomagnetic storm in the region of plasma pressure maximum. The position of this maximum agrees with the prediction of the ORB formation theory based on the analysis of ring current development during storm. We emphasize the role of adiabatic processes in the ORB dynamics and the importance of the substorm injections during storm recovery phase for the formation of enhanced fluxes of ORB electrons after the storm.

Comparison of TWINS and THEMIS observations of proton pitch angle distributions in the ring current during the 29 May 2010 geomagnetic storm

2013 ◽  
Vol 118 (8) ◽  
pp. 4895-4905 ◽  
Author(s):  
E. W. Grimes ◽  
J. D. Perez ◽  
J. Goldstein ◽  
D. J. McComas ◽  
P. Valek ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Pitch Angle ◽  
Ring Current

scholarly journals Discovering the Low-Latitude Ionospheric Trough Associated With the Inner Radiation Belt

2021 ◽  
Author(s):  
Alexander Karpachev
Keyword(s):  
Geomagnetic Storm ◽  
Radiation Belt ◽  
Ring Current ◽  
Recovery Phase ◽  
Low Latitude ◽  
Champ Satellite ◽  
Main Ionospheric Trough ◽  
Long Time ◽  
Late Recovery ◽  
First Time

Abstract The dynamics of ionospheric troughs during great geomagnetic storm on April 11–13, 2001 is considered. An analysis is based on measurements of electron density at altitudes of the CHAMP satellite 410–465 km. The subauroral, mid-latitude and low-latitude troughs were observed at nighttime, sometimes simultaneously. The subauroral trough is usually defined as the main ionospheric trough. The mid-latitude trough is associated with the magnetospheric ring current. It appears at the beginning of the storm recovery phase at latitudes of 40–45° GMLat (L=1.7–2.0) and exists for a long time at the late recovery phase at latitudes of the residual ring current 50–55° GMLat (L~2.4–3.0). The low-latitude trough was revealed for the first time. It is developed at the latitudes of the inner radiation belt 34–45° GMLat (L=1.45–2.00). This trough is associated with the precipitation of energetic particles from the inner radiation belt.

Strong pitch-angle diffusion of ring current ions in geomagnetic storm-associated conditions

2007 ◽  
Vol 69 (1-2) ◽  
pp. 142-150 ◽  
Author(s):  
G.V. Khazanov ◽  
K.V. Gamayunov ◽  
D.L. Gallagher ◽  
J.F. Spann
Keyword(s):  
Geomagnetic Storm ◽  
Pitch Angle ◽  
Ring Current ◽  
Associated Conditions

scholarly journals Ring current development during the great geomagnetic storm of February 1986

1988 ◽  
Vol 93 (A12) ◽  
pp. 14343 ◽  
Author(s):  
D. C. Hamilton ◽  
G. Gloeckler ◽  
F. M. Ipavich ◽  
W. Stüdemann ◽  
B. Wilken ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Ring Current ◽  
Current Development

Formation of the geomagnetic storm main-phase ring current

1961 ◽  
Vol 66 (11) ◽  
pp. 3631-3637 ◽  
Author(s):  
A. J. Dessler ◽  
W. B. Hanson ◽  
E. N. Parker
Keyword(s):  
Geomagnetic Storm ◽  
Ring Current ◽  
Main Phase ◽  
Storm Main Phase
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