scholarly journals Incoherent scatter spectrum theory for modes propagating perpendicular to the geomagnetic field

2006 ◽  
Vol 111 (A6) ◽  
Author(s):  
Erhan Kudeki ◽  
Marco Milla
Keyword(s):  
Geomagnetic Field ◽  
Incoherent Scatter ◽  
Scatter Spectrum

scholarly journals Particle precipitations during NEIAL events: simultaneous ground based observations at Svalbard

2007 ◽  
Vol 25 (6) ◽  
pp. 1323-1336 ◽  
Author(s):  
J. Lunde ◽  
B. Gustavsson ◽  
U. P. Løvhaug ◽  
D. A. Lorentzen ◽  
Y. Ogawa
Keyword(s):  
Minimum Energy ◽  
Soft Particle ◽  
Particle Precipitation ◽  
Characteristic Energy ◽  
Incoherent Scatter ◽  
Large Numbers ◽  
All Optical ◽  
Ion Acoustic ◽  
Scatter Spectrum ◽  
First Time

Abstract. In this paper we present Naturally Enhanced Ion Acoustic Lines (NEIALs) observed with the EISCAT Svalbard Radar (ESR). For the first time, long sequences of NEIALs are recorded, with more than 50 events within an hour, ranging from 6.4 to 140 s in duration. The events took place from ~08:45 to 10:00 UT, 22 January 2004. We combine ESR data with observations of optical aurora by a meridian scanning photometer at wavelengths 557.7, 630.0, 427.8, and 844.6 nm, as well as records from a magnetometer and an imaging riometer. The large numbers of observed NEIALs together with these additional observations, enable us to characterise the particle precipitation during the NEIAL events. We find that the intensities in all optical lines studied must be above a certain level for the NEIALs to appear. We also find that the soft particle precipitation is associated with the down-shifted shoulder in the incoherent scatter spectrum, and that harder precipitation may play a role in the enhancement of the up-shifted shoulder. The minimum energy flux during NEIAL events found in this study was ~3.5 mW/m2 and minimum characteristic energy around 50 eV.

Incoherent scatter spectrum of ionospheric plasma with an anisotropic temperature ion distribution

2012 ◽  
Vol 340 (2) ◽  
pp. 237-243 ◽  
Author(s):  
Bao-Ke Ma ◽  
Li-Xin Guo ◽  
Hong-Tao Su ◽  
Bei-Chen Zhang ◽  
Hong-Qiao Hu
Keyword(s):  
Ionospheric Plasma ◽  
Ion Distribution ◽  
Incoherent Scatter ◽  
Anisotropic Temperature ◽  
Scatter Spectrum

Observations of Plasma Line Splitting in the Ionospheric Incoherent Scatter Spectrum

2008 ◽  
Vol 100 (4) ◽  
Author(s):  
Asti N. Bhatt ◽  
Michael J. Nicolls ◽  
Michael P. Sulzer ◽  
Michael C. Kelley
Keyword(s):  
Incoherent Scatter ◽  
Line Splitting ◽  
Plasma Line ◽  
Scatter Spectrum

High frequency induced enhancements of the incoherent scatter spectrum at Arecibo

1972 ◽  
Vol 77 (7) ◽  
pp. 1242-1250 ◽  
Author(s):  
Herbert C. Carlson ◽  
William E. Gordon ◽  
Robert L. Showen
Keyword(s):  
High Frequency ◽  
Incoherent Scatter ◽  
Scatter Spectrum

scholarly journals Charged dust in the D-region incoherent scatter spectrum

2021 ◽  
Vol 87 (5) ◽  
Author(s):  
Tinna L. Gunnarsdottir ◽  
Ingrid Mann
Keyword(s):  
Electromagnetic Waves ◽  
Dust Particles ◽  
Charged Dust ◽  
Vhf Radar ◽  
Model Calculations ◽  
Incoherent Scatter ◽  
D Region ◽  
Dust Detection ◽  
Dust Component ◽  
Scatter Spectrum

We investigate the influence of charged dust on the incoherent scatter from the D-region ionosphere. Incoherent scatter is observed with high-power, large aperture radars and results from electromagnetic waves scattering at electrons that are coupled to other charged components through plasma oscillations. The influence of charged dust can hence be considered an effect of dusty plasma. The D-region contains meteoric smoke particles that are of nanometre size and form from incoming ablating meteors. Detection of such charged dust in the incoherent scatter spectrum from the D-region has previously been proposed and studied to some degree. We here present model calculations to investigate the influence of the charged dust component with a size distribution, instead of the one size dust components assumed in other works. The developed code to calculate the incoherent scatter spectrum from the D-region including dust particles with different sizes and different positive and negative charge states is made available (https://doi.org/10.18710/GHZIIY). We investigate how sizes, number density and charge state of the dust influence the spectrum during different ionospheric conditions. We consider the ionospheric parameters for the location of the EISCAT VHF radar during a year and find that conditions are most suitable for dust detection in winter below 80 km at times with increased electron densities. The prospects to derive dust parameters increase, when the incoherent scatter observations are combined with those of other instruments to provide independent information on electron density, neutral density and temperature.

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