A discussion on D and E region winds over Europe - The measurement of ionospheric drifts over east Siberia, U.S.S.R

1972 ◽  
Vol 271 (1217) ◽  
pp. 499-508 ◽  
Keyword(s):  
Solar Cycle ◽  
Oblique Incidence ◽  
East Siberia ◽  
E Region ◽  
Ionospheric Drifts ◽  
Ionospheric Drift ◽  
Spaced Receiver Method

The results of an investigation of horizontal ionospheric drifts over Irkutsk (52° N, 104° E) by the closely spaced receiver method (D 1) are presented for 1958—9. The nature of diurnal, seasonal and solar-cycle variations of ionospheric drift patterns are discussed. The measurement of ionospheric drifts was carried out during 1968—9 by the D1 method (2.2 MHz) operating simultaneously at vertical and slightly oblique incidence. The results of this experiment are discussed too.

A discussion on D and E region winds over Europe - The significance and interpretation of ionospheric drift measurements in the low-frequency range

1972 ◽  
Vol 271 (1217) ◽  
pp. 473-484 ◽  
Keyword(s):  
Solar Cycle ◽  
Seasonal Variations ◽  
Democratic Republic ◽  
Low Frequency ◽  
Frequency Range ◽  
Wind Measurements ◽  
E Region ◽  
Radar Meteor ◽  
Ionospheric Drift

Ionospheric drift measurements in the low-frequency range can be shown by comparison with corresponding radar-meteor wind measurements to indicate, in general, very nearly the actual neutral air wind in the 90 to 100 km height region. From m any years of such measurements at two stations in the Germ an Democratic Republic, results have been obtained on both the prevailing and the semidiurnal (tidal) wind components, their seasonal variations, their dependence on the solar cycle and their anomalies during certain major mid-winter stratospheric warmings.

A discussion on D and E region winds over Europe - Results of E-layer drift measurements at De Bilt

1972 ◽  
Vol 271 (1217) ◽  
pp. 485-497 ◽  
Keyword(s):  
Harmonic Analysis ◽  
Correlation Functions ◽  
Cross Correlation ◽  
Analogue Computer ◽  
On Line ◽  
E Region ◽  
Spaced Receiver Method

At the beginning of 1969 an elaborate programme of E-layer drift measurements was started at De Bilt. The closely spaced receiver method is being used in combination with an on-line analogue computer which plots the polarity-, auto- and cross-correlation functions of the fading signals. The following results over 1969 and a part of 1970 are presented and discussed: mean hourly values of the N and E components for each month; harmonic analysis and prevailing winds, comparison between results obtained from the intersection of the correlation curves and from the time shifts for maximum cross-correlation; and comparison with the results from other stations at about the same latitude.

11-Year solar cycle extreme ultraviolet and soft X-ray variations according to the ionospheric E-region data and results of direct measurements

2000 ◽  
Vol 25 (1) ◽  
pp. 73-78 ◽  
Author(s):  
A.A. Nusinov ◽  
L.A. Antonova ◽  
T.V. Kazachevskaya ◽  
V.V. Katyushina ◽  
P.M. Svidsky
Keyword(s):  
Solar Cycle ◽  
Extreme Ultraviolet ◽  
X Ray ◽  
Direct Measurements ◽  
Region Data ◽  
E Region

Comparative studies of E-region ionospheric drifts and meteor winds

1975 ◽  
Vol 23 (3) ◽  
pp. 389-400 ◽  
Author(s):  
D.G. Felgate ◽  
A.N. Hunter ◽  
S.P. Kingsley ◽  
H.G. Muller
Keyword(s):  
Comparative Studies ◽  
E Region ◽  
Ionospheric Drifts

scholarly journals Mid Latitude Sporadic E-layer Variability during Ascending Phase of Solar Cycle 24

2017 ◽  
Vol 9 (1) ◽  
pp. 27-41
Author(s):  
R. Atulkar ◽  
P. A. Khan ◽  
A. A. Mansoori ◽  
P. K. Purohit
Keyword(s):  
Solar Cycle ◽  
Summer Season ◽  
High Solar Activity ◽  
Night Time ◽  
Solar Cycle 24 ◽  
E Region ◽  
Sporadic E Layer ◽  
Sporadic E ◽  
Cycle 24 ◽  
Short Time

The paper presents a comparative study of the ionospheric sporadic E layer parameters (fbEs, foEs, and h’Es) retrieved from ground based ionosonde at mid latitude station Yamagawa, Japan (31.20 N, 130.370 E) during the ascending phase of 24th solar cycle i.e. during January 2012 to December 2014. The comparison between the E-region parameters has been carried out on a diurnal, seasonal, annual and day night basis. The diurnal maxima of foEs, fbEs, and h’Es are generally higher during high solar activity. From the present study it is found that the highest values of fbEs are observed during the summer while the lowest values are observed during autumn at mid latitude. Similarly, the highest values of foEs are observed during the summer season while the lowest values are recorded in autumn season. However, the highest values of h’Es are recorded during the spring and the lowest values are recorded in autumn. The variability of Es during the day and night time is also studied. The sporadic E can form and disappear in a short time during either the day or night. We have also studied the percentage occurrence of sporadic E. The occurrence of Es changes from year to year.

scholarly journals Night-time F-region and daytime E-region ionospheric drifts measured at Udaipur during solar flares

2002 ◽  
Vol 20 (11) ◽  
pp. 1837-1842 ◽  
Author(s):  
B. M. Vyas ◽  
R. Pandey
Keyword(s):  
Electric Fields ◽  
Solar Flares ◽  
Night Time ◽  
Low Latitude ◽  
F Region ◽  
Reflection Height ◽  
E Region ◽  
Electric Fields And Currents ◽  
East West ◽  
Ionospheric Drifts

Abstract. Ionospheric drifts measured at a low latitude station, Udaipur (Geomag. Lat. 14.5° N), in the night-time F-region and daytime E-region during solar flares have been studied. The night-time observations, which correspond to the F-region drifts, were carried out on five different nights. The daytime observation corresponding to the E-region drifts is only for one day. It is found that the apparent drift during the solar flare period is reduced considerably, in the daytime E-region as well as in the night-time F-region. The East-West and North-South components of the apparent drift speed are also similarly affected. For the daytime E-region drifts during a flare, increased ionization and subsequent reduction of reflection height is proposed to be the cause of reduced drift speeds. For the night-time F-region drifts, a reduced electric field at the F-region heights resulting from coupling of sunlit and dark hemispheres has been proposed to be the possible cause.Key words. Ionosphere (electric fields and currents; ionospheric disturbances)

scholarly journals Influence of the semidiurnal lunar tide in the equatorial plasma bubble zonal drifts over Brazil

2021 ◽  
Vol 39 (6) ◽  
pp. 1005-1012
Author(s):  
Igo Paulino ◽  
Ana Roberta Paulino ◽  
Amauri F. Medeiros ◽  
Cristiano M. Wrasse ◽  
Ricardo Arlen Buriti ◽  
...  
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Electron Concentration ◽  
Complex Dynamics ◽  
The Other ◽  
High Solar Activity ◽  
Lunar Tide ◽  
Plasma Bubble ◽  
E Region ◽  
Equatorial Plasma Bubble

Abstract. Using OI6300 airglow images collected over São João do Cariri (7.4∘ S, 36.5∘ W) from 2000 to 2007, the equatorial plasma bubble (EPB) zonal drifts were calculated. A strong day-to-day variability was observed in the EPB zonal drifts, which is directly associated with the very complex dynamics of the nighttime thermosphere–ionosphere system near the Equator. The present work investigated the contribution of the semidiurnal lunar tide M2 for the EPB zonal drifts. The M2 presented an amplitude of 3.1 m s−1 in the EPB zonal drifts, which corresponds to 5.6 % of the average drifts. The results showed that the M2 amplitudes in the EPB zonal drifts were solar cycle and seasonally dependent. The amplitude of the M2 was stronger during the high solar activity, reaching over 10 % of the EPB zonal drift average. Regarding the seasons, during the Southern Hemisphere summer, the M2 amplitude was twice as large (12 %) compared to the equinox ones. The seasonality agrees with other observations of the M2 in the ionospheric parameters such as vertical drifts and electron concentration, for instance. On the other hand, the very large M2 amplitudes found during the high solar activity agree with previous observations of the lunar tide in the ionospheric E region.

ABNORMAL E REGION IONIZATION

1951 ◽  
Vol 29 (3) ◽  
pp. 251-261 ◽  
Author(s):  
N. C. Gerson
Keyword(s):  
Oblique Incidence ◽  
Center Of Mass ◽  
Radio Observations ◽  
Order Of Magnitude ◽  
E Region ◽  
Sporadic E

Oblique incidence radio observations on sporadic E reveal both the movement and geographical extent of these reflection areas. On 13 June 1949 two Es centers were observed by this method. The first sporadic E center developed rapidly until it included an area of over 106 km.2; the second Es center was much smaller. The velocity of the center of mass of the first area was about SE 100 km. per hr. (in the meteorological usage; i.e., from the SE) and the velocity of the second, about SSE 270 km. per hr. Drift velocities in the ionosphere obtained by other investigators are of about this order of magnitude.

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