scholarly journals Penetration electric fields at the nightside dip equator associated with the main impulse of the storm sudden commencement of 8 July 1991

2002 ◽  
Vol 107 (A12) ◽  
pp. SIA 9-1-SIA 9-8 ◽  
Author(s):  
J. Hanumath Sastri
Keyword(s):  
Electric Fields ◽  
Sudden Commencement ◽  
Storm Sudden Commencement ◽  
Dip Equator

scholarly journals Influence of uncertainties of the empirical models for inferring the E-region electric fields at the dip equator

2016 ◽  
Vol 68 (1) ◽  
Author(s):  
Juliano Moro ◽  
Clezio Marcos Denardini ◽  
Laysa Cristina Araújo Resende ◽  
Sony Su Chen ◽  
Nelson Jorge Schuch
Keyword(s):  
Electric Fields ◽  
Empirical Models ◽  
E Region ◽  
Dip Equator

E region electric fields at the dip equator and anomalous conductivity effects

2013 ◽  
Vol 51 (10) ◽  
pp. 1857-1869 ◽  
Author(s):  
C.M. Denardini ◽  
H.C. Aveiro ◽  
J.H.A. Sobral ◽  
J.V. Bageston ◽  
L.M. Guizelli ◽  
...  
Keyword(s):  
Electric Fields ◽  
E Region ◽  
Dip Equator

Penetration of polar electric fields to the nightside dip equator at times of geomagnetic sudden commencements

1993 ◽  
Vol 98 (A10) ◽  
pp. 17517 ◽  
Author(s):  
J. Hanumath Sastri ◽  
J. V. S. Visweswara Rao ◽  
K. B. Ramesh
Keyword(s):  
Electric Fields ◽  
Sudden Commencements ◽  
Dip Equator

scholarly journals Observations of ionospheric flows and particle precipitation following a Sudden Commencement

2000 ◽  
Vol 18 (8) ◽  
pp. 908-917 ◽  
Author(s):  
E. Nielsen ◽  
F. Honary
Keyword(s):  
Electric Fields ◽  
Interplanetary Shock ◽  
Sudden Commencement ◽  
Interplanetary Shocks ◽  
Particle Precipitation ◽  
Flow Modulation ◽  
Interplanetary Physics ◽  
Flow Speeds ◽  
Wind Spacecraft ◽  
Electric Fields And Currents

Abstract. On May 4, 1998, at 0227 UT an interplanetary shock crossed the WIND spacecraft, and half an hour later a Sudden Commencement occurred. Coinciding with the Sudden Commencement a rapid intensification of the flux of particle precipitation into the ionosphere was observed. Evidence is presented that the ionospheric electric fields were influenced by the associated dynamic variations of the ionospheric conductivities. Following the initial phase the ionospheric flow speeds increased rapidly over the next 20 min to more than 2000 m/s, in agreement with an increased effective coupling of the solar wind energy to the magnetosphere following the interplanetary shock that caused the Sudden Commencement. These strong flows were meandering in latitude, a type of plasma flow modulation that has been reported before to occur during Omega band events: a string of alternating field-aligned currents propagating eastward. The riometer absorption was found to be at a minimum in regions associated with outward directed field aligned currents. The riometer absorption regions (the regions of particle precipitation) were drifting  with E × B drift speed of the ionospheric electrons.Key words: Interplanetary physics (interplanetary shocks) - Ionosphere (electric fields and currents) - Magnetospheric physics (energetic particles, precipitating)

scholarly journals EandFregion electric fields over dip equator

1981 ◽  
Vol 86 (A4) ◽  
pp. 2095 ◽  
Author(s):  
S. Prakash ◽  
P. Muralikrishna
Keyword(s):  
Electric Fields ◽  
Dip Equator

scholarly journals Signatures of 2-day wave in the E-region electric fields and their relationship to winds and ionospheric currents

2009 ◽  
Vol 27 (2) ◽  
pp. 631-638 ◽  
Author(s):  
H. C. Aveiro ◽  
C. M. Denardini ◽  
M. A. Abdu
Keyword(s):  
Electric Fields ◽  
Magnetic Activity ◽  
Ionospheric Currents ◽  
Coherent Scatter ◽  
Meridional Winds ◽  
Magnetometer Data ◽  
E Region ◽  
Dip Equator ◽  
Ionospheric Electric Field ◽  
Coherent Radar

Abstract. We analyze the effects of the 2-day wave activity in the EEJ using one coherent scatter radar and eight magnetometer stations located close to the dip equator. The wavelet analysis of the magnetometer data reveals a 2-day signature in the semidiurnal geomagnetic tide. The E-region zonal background ionospheric electric field, derived from coherent radar measurements, shows 2-day oscillations in agreement with such oscillations in the magnetometers data. An anticorrelation between the amplitude of the tidal periodicites (diurnal and semidiurnal) and that of the 2-day signature is also shown in the electric fields. The results are compared with simultaneous observations of 2-day planetary wave in meridional winds and ionosonde data. Further, our results are discussed based on the analysis of the magnetic activity.

scholarly journals Global MHD test particle simulations of >10 MeV radiation belt electrons during storm sudden commencement

2007 ◽  
Vol 112 (A9) ◽  
pp. n/a-n/a ◽  
Author(s):  
B. T. Kress ◽  
M. K. Hudson ◽  
M. D. Looper ◽  
J. Albert ◽  
J. G. Lyon ◽  
...  
Keyword(s):  
Test Particle ◽  
Radiation Belt ◽  
Sudden Commencement ◽  
Storm Sudden Commencement ◽  
Particle Simulations ◽  
Radiation Belt Electrons
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