Energetic electron response to interplanetary shocks at geosynchronous orbit

2015 ◽  
Vol 120 (6) ◽  
pp. 4669-4683 ◽  
Author(s):  
Y. Liu ◽  
Q.‐G. Zong
Keyword(s):  
Energetic Electron ◽  
Geosynchronous Orbit ◽  
Interplanetary Shocks

scholarly journals Magnetic dipolarizations inside geosynchronous orbit with tailward ion flows

2019 ◽  
Vol 37 (3) ◽  
pp. 289-297 ◽  
Author(s):  
Xiaoying Sun ◽  
Weining William Liu ◽  
Suping Duan
Keyword(s):  
Plasma Sheet ◽  
Sharp Increase ◽  
Energetic Electron ◽  
Elevation Angle ◽  
Time History ◽  
Geosynchronous Orbit ◽  
Inner Magnetosphere ◽  
Transfer Path ◽  
New Energy ◽  
History Of

Abstract. Electromagnetic field and plasma data from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) near-Earth probes are used to investigate magnetic dipolarizations inside geosynchronous orbit on 27 August 2014 during an intense substorm with AEmax∼1000 nT. THEMIS-D (TH-D) was located inside geosynchronous orbit around midnight in the interval from 09:25 to 09:55 UT. During this period, two distinct magnetic dipolarizations with tailward ion flows are observed by TH-D. The first one is indicated by the magnetic elevation angle increase from 15 to 25∘ around 09:30:40 UT. The tailward perpendicular velocity is V⊥x∼-50 km s−1. The second one is presented by the elevation angle increase from 25 to 45∘ around 09:36 UT, and the tailward perpendicular velocity is V⊥x∼-70 km s−1. These two significant dipolarizations are accompanied with the sharp increase in the energy flux of energetic electron inside geosynchronous orbit. After a 5 min expansion of the near-Earth plasma sheet (NEPS), THEMIS-E (TH-E) located outside geosynchronous orbit also detected this tailward expanding plasma sheet with ion flows of −150 km s−1. The dipolarization propagates tailward with a speed of −47 km s−1 along a 2.2 RE distance in the X direction between TH-D and TH-E within 5 min. These dipolarizations with tailward ion flows observed inside geosynchronous orbit indicate a new energy transfer path in the inner magnetosphere during substorms.

scholarly journals Energetic electron response to ULF waves induced by interplanetary shocks in the outer radiation belt

2009 ◽  
Vol 114 (A10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Q.-G. Zong ◽  
X.-Z. Zhou ◽  
Y. F. Wang ◽  
X. Li ◽  
P. Song ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Energetic Electron ◽  
Ulf Waves ◽  
Interplanetary Shocks ◽  
Outer Radiation Belt

Drifting holes in the energetic electron flux at geosynchronous orbit following substorm onset

1992 ◽  
Vol 97 (A5) ◽  
pp. 6541 ◽  
Author(s):  
V. A. Sergeev ◽  
T. Bösinger ◽  
R. D. Belian ◽  
G. D. Reeves ◽  
T. E. Cayton
Keyword(s):  
Electron Flux ◽  
Energetic Electron ◽  
Substorm Onset ◽  
Geosynchronous Orbit

Energetic electron components at geosynchronous orbit

1989 ◽  
Vol 16 (2) ◽  
pp. 147-150 ◽  
Author(s):  
T. E. Cayton ◽  
R. D. Belian ◽  
S. P. Gary ◽  
T. A. Fritz ◽  
D. N. Baker
Keyword(s):  
Energetic Electron ◽  
Geosynchronous Orbit

scholarly journals Magnetic dipolarizations inside geosynchronous orbit with tailward ions flow

2018 ◽  
Author(s):  
Xiaoying Sun ◽  
Weining William Liu ◽  
Suping Duan
Keyword(s):  
Plasma Sheet ◽  
Energetic Electron ◽  
Elevation Angle ◽  
Time History ◽  
Geosynchronous Orbit ◽  
Inner Magnetosphere ◽  
Ion Flow ◽  
Transfer Path ◽  
New Energy ◽  
History Of

Abstract. Electromagnetic field and plasma data from the Time History of Events and Macroscale Interactions duringSubstorms (THEMIS) near-Earth probes are used to investigate magnetic dipolarizations inside geosynchronous orbit on 27 August 2014 during an intense substorm with AEmax ~ 1000 nT. THEMIS-D (TH-D) was located inside geosynchronous orbit around midnight in the interval from 09:25 UT to 09:55 UT. During this period two distinct magnetic dipolarizations with tailward ions flow are observed by TH-D. The first one is displayed by magnetic elevation angle increase from 15 degree to 25 degree around 09:30:40 UT. The tailward perpendicular velocity is V⟂x ~ −50 km/s. The second one is presented by the elevation angle increase from 25 degree to 45 degree around 09:36 UT. And the tailward perpendicular velocity is V⟂x ~ −70 km/s. These two significant dipolarizations are accompanied with the sharp increase in the energy flux of energetic electron inside geosynchronous. After 5 min expanding of near-Earth plasma sheet (NEPS), THEMIS-E (TH-E) located outside geosynchronous orbit also detects this tailward expanding plasma sheet with ion flow −150 km/s. The dipolarization propagates tailward with speed −47 km/s, along 2.2 RE distance in the X direction between TH-D and TH-E within 5 min. These dipolarizations with tailward ions flow observed inside geosynchronous orbit indicate new energy transfer path in the inner magnetosphere during substorms.

Energetic electron distributions fitted with a relativistic kappa-type function at geosynchronous orbit

2008 ◽  
Vol 113 (A5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Fuliang Xiao ◽  
Chenglong Shen ◽  
Yuming Wang ◽  
Huinan Zheng ◽  
Shui Wang
Keyword(s):  
Energetic Electron ◽  
Geosynchronous Orbit ◽  
Type Function ◽  
Electron Distributions

scholarly journals Observations at geosynchronous orbit of a persistent Pc5 geomagnetic pulsation and energetic electron flux modulations

2007 ◽  
Vol 25 (7) ◽  
pp. 1653-1667 ◽  
Author(s):  
T. E. Sarris ◽  
T. M. Loto'aniu ◽  
X. Li ◽  
H. J. Singer
Keyword(s):  
Spectral Analysis ◽  
Electron Flux ◽  
Narrow Band ◽  
Resonance Effect ◽  
Energetic Electron ◽  
Conclusive Evidence ◽  
Geosynchronous Orbit ◽  
Net Energy ◽  
Pulsation Frequency ◽  
External Fluctuations

Abstract. A long lasting narrow-band (4–7 mHz) Pc5 fluctuation event at geosynchronous orbit is presented through measurements from GOES-8 and GOES-10 and the response of energetic electrons with drift frequencies close to the narrow-band pulsation frequency is monitored through a spectral analysis of flux data from the LANL-SOPA energetic electron instrument. This analysis shows electron flux modulations at the magnetospheric pulsation's frequency as well as at various other frequencies in the Pc5 range, related to the particles' drift-frequencies and their harmonics. A drift resonance effect can be seen, with electron flux modulation becoming more evident in the energy channels of electrons with drift frequencies closer to the wave frequency; however no net increase or decrease in energetic electron flux is observed, indicating that the net energy transfer and transport of electrons is not significant. This Pc5 event has a long duration, being observed for more than a couple of days at geosynchronous orbit over several traversals of the two GOES satellites, and is localized in azimuthal extent. Spectral analysis shows that most of the power is in the transverse components. The frequency of the narrow-band event, as observed at geosynchronous orbit shifts during the time of the event from 7±0.5 mHz to about 4±0.5 mHz. On the ground, CARISMA magnetometers record no distinct narrow-band fluctuation in the magnetic field, and neither does Geotail, which is traversing the outer magnetosphere a few RE further out from geosynchronous orbit, at the same UT and LT that GOES-8 and -10 observe the pulsations, suggesting that that there is no connection to external fluctuations originating in the solar wind. An internal generation mechanism is suggested, such as could be provided by energetic ring current particles, even though conclusive evidence could not be provided for this particular event. Through a statistical study, it is found that this event belongs to a class of similar events, occurring predominantly in the post-noon region in the inner magnetosphere.

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