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 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

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 Letter to the editor: Electric field fluctuations (25-35 min) in the midnight dip equatorial ionosphere

2000 ◽  
Vol 18 (2) ◽  
pp. 252-256 ◽  
Author(s):  
J. Hanumath Sastri ◽  
H. Luhr ◽  
H. Tachihara ◽  
T. -I. Kitamura ◽  
J. V. S. V. Rao
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Geomagnetic Latitude ◽  
Equatorial Ionosphere ◽  
Plasma Drift ◽  
F Region ◽  
Vertical Drift ◽  
Field Fluctuations ◽  
Dip Equator ◽  
Electric Fields And Currents

Abstract. Measurements with a HF Doppler sounder at Kodaikanal (10.2°N, 77.5°E, geomagnetic latitude 0.8°N) showed conspicuous quasi-periodic fluctuations (period 25-35 min) in F region vertical plasma drift, Vz in the interval 0047-0210 IST on the night of 23/24 December, 1991 (Ap = 14, Kp < 4-). The fluctuations in F region vertical drift are found to be coherent with variations in Bz (north-south) component of interplanetary magnetic field (IMF), in geomagnetic H/X components at high-mid latitude locations both in the sunlit and dark hemispheres and near the dayside dip equator, suggestive of DP2 origin. But the polarity of the electric field fluctuations at the midnight dip equator (eastward) is the same as the dayside equator inferred from magnetic variations, contrary to what is expected of equatorial DP2. The origin of the coherent occurrence of equatorial electric field fluctuations in the DP2 range of the same sign in the day and night hemispheres is unclear and merits further investigations.Key words: Ionosphere (electric fields and currents; equatorial ionosphere; ionosphere-magnetosphere interactions)

scholarly journals Equatorial E region electric fields at the dip equator: 1. Variabilities in eastern Brazil and Peru

2016 ◽  
Vol 121 (10) ◽  
pp. 10,220-10,230 ◽  
Author(s):  
J. Moro ◽  
C. M. Denardini ◽  
L. C. A. Resende ◽  
S. S. Chen ◽  
N. J. Schuch
Keyword(s):  
Electric Fields ◽  
Eastern Brazil ◽  
E Region ◽  
Dip Equator

scholarly journals Response of ionospheric electric fields at mid‐low latitudes during sudden commencements

2015 ◽  
Vol 120 (6) ◽  
pp. 4849-4862 ◽  
Author(s):  
N. Takahashi ◽  
Y. Kasaba ◽  
A. Shinbori ◽  
Y. Nishimura ◽  
T. Kikuchi ◽  
...  
Keyword(s):  
Electric Fields ◽  
Ionospheric Electric Fields ◽  
Low Latitudes ◽  
Sudden Commencements
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