Diurnal and seasonal variations of ionospheric plasma parameters on solar activity abatement

2006 ◽  
Vol 12 (2-3) ◽  
pp. 45-58 ◽  
Author(s):  
M.V. Lyashenko ◽  
◽  
I.B. Sklyarov ◽  
L.F. Chernogor ◽  
Yu.V. Chernyak ◽  
...  
Keyword(s):  
Solar Activity ◽  
Seasonal Variations ◽  
Ionospheric Plasma ◽  
Plasma Parameters

Diurnal and seasonal variations of ionospheric plasma parameters during rise solar activity period

2006 ◽  
Vol 12 (5-6) ◽  
pp. 58-68 ◽  
Author(s):  
M.V. Lyashenko ◽  
◽  
V.A. Pulyaev ◽  
L.F. Chernogor ◽  
◽  
...  
Keyword(s):  
Solar Activity ◽  
Seasonal Variations ◽  
Ionospheric Plasma ◽  
Activity Period ◽  
Plasma Parameters ◽  
Solar Activity Period

scholarly journals Shift of effective lightning areas during pre to post period of solar cycle minimum of 2008-2009 as determined from Schumann resonance studies at Agra, India

2015 ◽  
Vol 57 (6) ◽  
Author(s):  
Birbal Singh ◽  
Devbrat Pundhir
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Seasonal Variations ◽  
Thunderstorm Activity ◽  
Schumann Resonance ◽  
Cycle Minimum ◽  
Source Distance ◽  
Imaging Sensor ◽  
Post Period ◽  
Effective Source

<p>Employing a set of 3-component search coil magnetometer, Schumann resonance studies have been in progress at Agra (Geograph. lat. 27.2°N, long. 78°E), India since 01 April, 2007. We have analysed the data for two periods; first from 01 April, 2007 to 31 March, 2008 (period-I), and then from 01 March, 2011 to 29 February, 2012 (period-II) which correspond to pre and post periods of solar cycle minimum of 2008-2009. From the diurnal variation of first mode intensity and frequency, we study the seasonal variations of global thunderstorm activity, effective source distance and level of lightning during both the periods. We show that world thunderstorm activity shifts to summer in the northern hemisphere as the effective source distance approaches close to the observer, and the level of intense lightning shifts from the month of July, 2007 in period-I to August, 2011 in period-II. This is supported by Lightning Imaging Sensor (LIS) satellite data also. A possible explanation in terms of increasing solar activity is suggested.</p>

scholarly journals Ionospheric Plasma Density Measurements by Swarm Langmuir Probes: Limitations and possible Corrections

2019 ◽  
Author(s):  
Piero Diego ◽  
Igino Coco ◽  
Igor Bertello ◽  
Maurizio Candidi ◽  
Pietro Ubertini
Keyword(s):  
Electron Density ◽  
Ionospheric Plasma ◽  
Operating Mode ◽  
Plasma Sheath ◽  
Langmuir Probes ◽  
Plasma Parameters ◽  
Density Measurements ◽  
Voltage Ripple ◽  
Electron Density And Temperature ◽  
Ionospheric Plasma Density

Abstract. The ESA Swarm constellation includes three satellites, which have been observing the Earth's ionosphere since November 2013, following polar orbits. The main ionospheric plasma parameters, such as electron density and temperature, are measured by means of Langmuir probes (Lps); electron density measurements, in particular, are nowadays largely considered as qualitatively reliable, and have been used in several published papers to date. In this work, we aim to discuss how some technical characteristics of Swarm Lps, such as their size and location on board the satellites, as well as the operational setup of the instruments, could lead to limitations in their accuracy if one underestimates the influence of satellite proximity, and the larger extension of the plasma sheath surrounding the probes due to the operational point of the voltage ripple. Two specific corrections are proposed for the assessment and possible mitigation of such effects. Finally, a comparison is made with electron density measurements from CSES-01 mission, which relies on Langmuir probes as well, whose geometry and operating mode are standard.

Change of ionospheric plasma parameters under the influence of electric field which has lithospheric origin and due to radon emanation

2004 ◽  
Vol 29 (4-9) ◽  
pp. 579-587 ◽  
Author(s):  
Y. Rapoport ◽  
V. Grimalsky ◽  
M. Hayakawa ◽  
V. Ivchenko ◽  
D. Juarez-R ◽  
...  
Keyword(s):  
Electric Field ◽  
Ionospheric Plasma ◽  
Radon Emanation ◽  
Plasma Parameters

scholarly journals Controlled beat-wave Brillouin scattering in the ionosphere

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
B. Eliasson ◽  
A. Senior ◽  
M. Rietveld ◽  
A. D. R. Phelps ◽  
R. A. Cairns ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Ionospheric Plasma ◽  
Brillouin Scattering ◽  
Scale Model ◽  
Plasma Parameters ◽  
Ion Acoustic Wave ◽  
Electromagnetic Pump ◽  
Pump And Probe ◽  
Ion Acoustic ◽  
Stimulated Brillouin

AbstractStimulated Brillouin scattering experiments in the ionospheric plasma using a single electromagnetic pump wave have previously been observed to generate an electromagnetic sideband wave, emitted by the plasma, together with an ion- acoustic wave. Here we report results of a controlled, pump and probe beat-wave driven Brillouin scattering experiment, in which an ion-acoustic wave generated by the beating of electromagnetic pump and probe waves, results in electromagnetic sideband waves that are recorded on the ground. The experiment used the EISCAT facility in northern Norway, which has several high power electromagnetic wave transmitters and receivers in the radio frequency range. An electromagnetic pump consisting of large amplitude radio waves with ordinary (O) or extraordinary (X) mode polarization was injected into the overhead ionosphere, along with a less powerful probe wave, and radio sideband emissions observed on the ground clearly show stimulated Brillouin emissions at frequencies agreeing with, and changing with, the pump and probe frequencies. The experiment was simulated using a numerical full-scale model which clearly supports the interpretation of the experimental results. Such controlled beat-wave experiments demonstrate a way of remotely investigating the ionospheric plasma parameters.

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