Results 131 to 140 of about 703 (173)

Analysis of digisonde drift measurements quality

Journal of Atmospheric and Solar-Terrestrial Physics, 2012
Ionosondes underwent significant improvements since their invention in 1924 (Breit and Tuve, 1926). At the beginning, ionospheric sounders measured only vertical profile of electron concentration. Contemporary modern digital ionosondes usually provide ionospheric drift measurement as a part of the routine monitoring in addition to the classical ...
Daniel Kouba, Petra Koucká Knížová
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Advancing Digisonde Technology: the DPS-4D

AIP Conference Proceedings, 2008
A new ionosonde, the Digisonde model DPS-4D, replaces the aging DPS-4. Faster computer hardware and operating systems together with digital transmitters/receivers provide unprecedented measurement flexibility, data precision, and signal processing gain. The novel features in this latest Digisonde are discussed and explained.
Bodo W. Reinisch, Ivan A. Galkin, Grigori M. Khmyrov, Alexander V. Kozlov, Igor A. Lisysyan, Klaus Bibl, George Cheney, David Kitrosser, Stephen Stelmash, Kevin Roche, Yan Luo, Vadym V. Paznukhov, Ryan Hamel, Paul Song, John Foster, Michael Mendillo, Dieter Bilitza   +16 more
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Low latitude digisonde measurements and comparison with IRI

Advances in Space Research, 1996
Abstract To compare measured electron density profiles with IRI predictions a rigorous algorithm is used to determine the average representative profile (ARP) from a set of individual electron density profiles. The technique is based on the Digisonde profile inversion that represents each profile by a set of boundary values and coefficients.
B.W. Reinisch, Xueqin Huang
openaire   +1 more source

Global median model of the F2-layer peak height based on ionospheric radio-occultation and ground-based Digisonde observations

Advances in Space Research, 2015
In this article, we present a global median model of the ionospheric F2-layer peak height (hmF2), which we named Satellite and Digisonde Model of the F2 layer (SDMF2).
Shubin, V. N.
exaly   +2 more sources

New input to IRI from the worldwide digisonde network

Advances in Space Research, 1994
Abstract Electron density profiles derived from Digisonde ionograms at Argentia, Millstone Hill, Wallops Island, Bermuda, Dourbes and Karachi are compared with IRI model prediction. Four months of data for 1989/90 were analyzed. For a number of station/months N(h) profiles were available every 15 or 30 minutes providing a good statistical database ...
B.W. Reinisch, C.F. Chen
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A topside investigation over a mid-latitude digisonde station in Cyprus

Advances in Space Research, 2021
Abstract We examine the systematic differences between topside electron density measurements recorded by different techniques over the low-middle latitude operating European station in Nicosia, Cyprus (geographical coordinates: 35.14oN, 33.2oE), (magnetic coordinates 31.86oN, 111.83 oE).
Arun Kumar Singh, Haris Haralambous, Christina Oikonomou, Theodoros Leontiou   +3 more
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High latitude Digisonde measurements and their relevance to IRI

Advances in Space Research, 1995
Abstract Digisondes operating at high latitudes provide new insights into the structure and dynamics of the polar cap and auroral ionosphere. These instruments derive the electron density profiles from vertical incidence ionograms, and the horizontal and vertical plasma velocities using the interferometric Doppler imaging drift technique.
B.W. Reinisch, T.W. Bullett, J.L. Scali, D.M. Haines   +3 more
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Research on ionosphere drift velocity based on digisonde observation

ISAPE2012, 2012
In this paper, a simply method was introduced to be calculated drift velocity of the ionosphere by analysis the frequency shift and phase change of the receiving signals from digisonde. By using data was observed with TR169 station at Tromso (E19.2°, N69.6°) and JI91J station at Jicamarca (W76.8°, S12.0°) in 2010, the ionosphere drift velocity were ...
Liu Rui, Guo Li-Xin, Wu Rong-Rong, Zhang Bei-Chen   +3 more
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Comparison between IRI predictions and digisonde measurements at Tucumán

Journal of Atmospheric and Solar-Terrestrial Physics, 2007
Abstract Several parameters, critical frequency foF2, total electron content (TEC), F2 layer peak height hmF2, and slab thickness τ are measured with a Digisonde 256 and compared with IRI 2001 predictions for Tucuman during quiet days in 2003. The comparisons between experimental and predicted diurnal curves for different seasons show a strong ...
V.H. Rios, C.F. Medina, P. Alvarez
exaly   +2 more sources

Digisonde Observations During Chemical Releases

1976
Abstract : Ionospheric observations with a Digisonde system during upper atmosphere chemical releases were carried out at Wallops Island (ALADDIN 74) in June 1974. Ionogram observations were combined with angle of arrival and Doppler measurements. Ionogram data of ALADDIN 72 and 74 were analyzed with reference to the chemical releases.
Bodo W. Reinisch, Klaus Bibl
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