The role of electric fields in sporadic E layer formation over low latitudes under quiet and magnetic storm conditions

2014 ◽  
Vol 115-116 ◽  
pp. 95-105 ◽  
Author(s):  
M.A. Abdu ◽  
J.R. de Souza ◽  
I.S. Batista ◽  
A.M. Santos ◽  
J.H.A. Sobral ◽  
...  
Keyword(s):  
Magnetic Storm ◽  
Electric Fields ◽  
Layer Formation ◽  
Low Latitudes ◽  
Sporadic E Layer ◽  
Sporadic E

scholarly journals The Possible Role of Turbopause on Sporadic‐E Layer Formation at Middle and Low Latitudes

Space Weather ◽  
2021 ◽  
Author(s):  
Qiong Tang ◽  
Chen Zhou ◽  
Huixin Liu ◽  
Yi Liu ◽  
Jiaqi Zhao ◽  
...  
Keyword(s):  
Layer Formation ◽  
Low Latitudes ◽  
Sporadic E Layer ◽  
Sporadic E

scholarly journals Equatorial E Region Electric Fields and Sporadic E Layer Responses to the Recovery Phase of the November 2004 Geomagnetic Storm

2017 ◽  
Vol 122 (12) ◽  
pp. 12,517-12,533 ◽  
Author(s):  
J. Moro ◽  
L. C. A. Resende ◽  
C. M. Denardini ◽  
J. Xu ◽  
I. S. Batista ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Electric Fields ◽  
Recovery Phase ◽  
E Region ◽  
Sporadic E Layer ◽  
Sporadic E

Sporadic E layer formation time

1968 ◽  
Vol 11 (9) ◽  
pp. 756-759
Author(s):  
Yu. A. Ignat'ev
Keyword(s):  
Formation Time ◽  
Layer Formation ◽  
Sporadic E Layer ◽  
Sporadic E

scholarly journals Characteristics of double sodium layer over Haikou, China (20.0° N, 110.1° E)

2019 ◽  
Vol 5 (2) ◽  
pp. 30-34
Author(s):  
Ян Дали ◽  
Yang Dali ◽  
Чжан Теминь ◽  
Zhang Tiemin ◽  
Ван Цзихун ◽  
...  
Keyword(s):  
Lower Thermosphere ◽  
Dye Laser ◽  
Low Latitude ◽  
Middle Latitudes ◽  
Sodium Layer ◽  
Layer Structures ◽  
Low Latitudes ◽  
Sporadic E Layer ◽  
Mesosphere And Lower Thermosphere ◽  
Sporadic E

We study the property of double sodium layer structures (DSLs) in the mesosphere and lower thermosphere (MLT) by a lidar at the low-latitude location of Haikou (20.0° N, 110.1° E), China. From April 2010 to December 2013, 21 DSLs were observed within a total of 377 observation days. DSLs were recorded at middle latitudes of Beijing and Wuhan, China, but were rarely observed at low latitudes. We analyze and discuss characteristics of DSLs such as time of occurrence, peak altitude, FWHM, duration time, etc. At the same time, the critical frequency foEs and the virtual height h'Es of the sporadic E layer Es were observed by an ionosonde over Danzhou (19.0° N, 109.3° E). We discuss such their characteristics as differences of time, differences of altitude compared to DSLs. We used an Nd:YAG laser pumped dye laser to generate the probing beam. The wavelength of the dye laser was set to 589 nm by a sodium fluorescence cell. The backscattered fluorescence photons from the sodium layer were collected by a telescope with the Φ1000 mm primary mirror.

scholarly journals Observation of electron biteout regions below sporadic E layers at polar latitudes

2015 ◽  
Vol 33 (3) ◽  
pp. 371-380 ◽  
Author(s):  
G. A. Lehmacher ◽  
M. F. Larsen ◽  
C. L. Croskey
Keyword(s):  
Electric Fields ◽  
Sounding Rockets ◽  
Ion Drift ◽  
Sporadic E Layers ◽  
New Process ◽  
Combined Action ◽  
Sporadic E Layer ◽  
Sporadic E ◽  
Chemical Releases ◽  
Trimethyl Aluminum

Abstract. The descent of a narrow sporadic E layer near 95 km altitude over Poker Flat Research Range in Alaska was observed with electron probes on two consecutive sounding rockets and with incoherent scatter radar during a 2 h period near magnetic midnight. A series of four trimethyl aluminum chemical releases demonstrated that the Es layer remained just slightly above the zonal wind node, which was slowly descending due to propagating long-period gravity waves. The location of the layer is consistent with the equilibrium position due to combined action of the wind shear and electric fields. Although the horizontal electric field could not be measured directly, we estimate that it was ~ 2 mV m−1 southward, consistent with modeling the vertical ion drift, and compatible with extremely quiet conditions. Both electron probes observed deep biteout regions just below the Es enhancements, which also descended with the sporadic layers. We discuss several possibilities for the cause of these depletions; one possibility is the presence of negatively charged, nanometer-sized mesospheric smoke particles. Such particles have recently been detected in the upper mesosphere, but not yet in immediate connection with sporadic E. Our observations of electron depletions suggest a new process associated with sporadic E.

scholarly journals <i>E</i>-region wind-driven electrical coupling of patchy sporadic-<i>E</i> and spread-<i>F</i> at midlatitude

2005 ◽  
Vol 23 (6) ◽  
pp. 2095-2105 ◽  
Author(s):  
S. Shalimov ◽  
C. Haldoupis
Keyword(s):  
Electric Fields ◽  
Electrical Coupling ◽  
Neutral Winds ◽  
Medium Scale ◽  
F Region ◽  
Sporadic E Layers ◽  
Spread F ◽  
Sporadic E ◽  
Electric Fields And Currents

Abstract. This paper investigates the role of neutral winds in the generation of relatively large polarization electric fields across patchy sporadic-E layers, which then map upward to the F region, to create conditions for medium-scale spread-F. The calculations are based on an analytical model that uses the current continuity equation and field-aligned current closures to the F region in order to describe quantitatively a Hall polarization process inside sporadic-E plasma patches during nighttime. In applying this model we use experimentally known values for E and F region, conductances, the ambient electric fields and prevailing neutral winds, in order to estimate the polarization fields that build up inside sporadic-E. It is found that the relatively strong west-southwest neutral winds during summer nighttime can provide the free energy for the generation of sizable polarization electric fields, which have comparable eastward and north-upward components and reach values of several mV/m. Given that the sporadic-E patches have sizes from a few to several tens of kilometers, the polarization fields can map easily to the F region bottomside where they impact ExB plasma uplifts and westward bulk motions, in line with key observational properties of medium-scale spread-F. However, the present simple model needs further development to also include wind forcing of the F region plasma and possible polarization processes inside spread-F. Keywords. Ionosphere (Electric fields and currents; Ionospheric irregularities; Mid-latitude ionosphere)

scholarly journals E- and F-region coupling between an intense sporadic E layer and a mesoscale traveling ionospheric disturbance

2009 ◽  
Vol 27 (6) ◽  
pp. 2475-2482 ◽  
Author(s):  
W. E. Swartz ◽  
M. C. Kelley ◽  
N. Aponte
Keyword(s):  
Electric Fields ◽  
Ionospheric Disturbance ◽  
Type I ◽  
Data Set ◽  
Coherent Scatter ◽  
F Region ◽  
Scatter Radar ◽  
Considerable Controversy ◽  
Sporadic E Layer ◽  
Sporadic E

Abstract. Considerable controversy exists concerning the relative roles of the E- and F-regions in controlling irregularity formation in the mid-latitude ionosphere, largely because electric fields due to a plasma instability in one region may map to the other if the perpendicular scales are sufficiently large. In this paper we look at a particularly fortuitous data set in which both E- and F-region observations were made using incoherent scatter radar, GPS, lidar, and coherent scatter radar. In this event, a dense, patchy sporadic E layer was detected that exhibited type I (two-stream) coherent echoes while, at the same time, the F-layer plasma was highly structured with plasma drifts of hundreds of m/s. We examine this event in the context of a mesoscale traveling ionospheric disturbance. The data presentation will be followed by comparison with current theories for coupling between these two regions.

scholarly journals Longitudinal Structure in the Altitude of the Sporadic E Observed by COSMIC in Low-Latitudes

2021 ◽  
Vol 13 (22) ◽  
pp. 4714
Author(s):  
Zhendi Liu ◽  
Qingfeng Li ◽  
Hanxian Fang ◽  
Ze Gao
Keyword(s):  
Dominant Role ◽  
Longitudinal Structure ◽  
Zonal Wavenumber ◽  
Low Latitudes ◽  
June Solstice ◽  
Sporadic E ◽  
First Time ◽  
De3 Tide ◽  
Northern And Southern Hemispheres

The longitudinal structure in the altitude of the Sporadic E (Es) was investigated for the first time based on the S4 index provided by the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) in low latitudes. The longitudinal structure is identified as a symmetrically located wavenumber-4 (WN4) pattern within 30°S–30°N. The WN4 occurs primarily during the daytime at the June solstice and equinoxes, with the largest amplitude at the September equinox and the smallest one at the March equinox. It moves eastward with a speed of ~90°/day. The strongest WN4 appears within 10–20°N and 5–15°S in the Northern and Southern hemispheres, respectively. At the June solstice and the September equinox, the WN4 is stronger in the Northern hemisphere than in the Southern hemisphere, while the situation is reversed at the March equinox. The altitude distribution of the convergence null in the diurnal eastward non-migrating tide with zonal wavenumber-3 (DE3) for the zonal wind is similar to that of the WN4. This and other similar features, such as the seasonal variation, eastward speed, and the symmetrical locations, support the dominant role of the DE3 tide for the formation of the WN4 structure.

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