Results 141 to 150 of about 703 (173)

Comparison of CHAMP and Digisonde plasma frequencies at Jicamarca, Peru

Radio Science, 2007
Ionospheric plasma frequencies at the altitude of the CHAMP satellite have been deduced from ionosonde true‐height profiles for Jicamarca, Peru, and have been compared with the in situ measurements made by CHAMP. The differences between the plasma frequencies have been found to be well within the uncertainties associated with the ionosonde profiles ...
L. F. McNamara, D. L. Cooke, C. E. Valladares, B. W. Reinisch   +3 more
openaire   +1 more source

Digisonde observations of TIDs with frequency and angular sounding technique

Advances in Space Research, 2012
A technique for studying ionospheric wavelike phenomena, primarily AGW/TID events, is developed based on the solution of the problem of radio wave propagation in ionospheric plasma disturbed by wavelike processes. A perfectly reflecting surface model is used for representing TIDs propagating at ionospheric heights. This technique is a generalization of
V.V. Paznukhov, V.G. Galushko, B.W. Reinisch   +2 more
openaire   +1 more source

Verification of the TSMP-assisted digisonde topside profiling technique

Acta Geophysica, 2009
The purpose of this paper is to evaluate the performance of the TSMP-assisted Digisonde (TaD) topside profiling technique. We present systematic comparisons between electron density profiles and TEC parameters extracted from TaD model with (a) CHAMP-derived TEC parameters, (b) CHAMP reconstructed profiles, (c) ground based GPSderived TEC parameters ...
Anna Belehaki, Ivan Kutiev, Bodo Reinisch, Norbert Jakowski, Pencho Marinov, Ivan Galkin, Chris Mayer, Ioanna Tsagouri, Themistocles Herekakis   +8 more
openaire   +1 more source

Exploring Digisonde Ionogram Data with SAO-X and DIDBase

AIP Conference Proceedings, 2008
A comprehensive suite of software tools for ionogram data analysis and archiving has been developed at UMLCAR to support the exploration of raw and processed data from the worldwide network of digisondes in a low-latency, user-friendly environment.
Grigori M. Khmyrov, Ivan A. Galkin, Alexander V. Kozlov, Bodo W. Reinisch, Jonathan McElroy, Claude Dozois, Paul Song, John Foster, Michael Mendillo, Dieter Bilitza   +9 more
openaire   +1 more source

Geomagnetic storm time studies using Digisonde data

Advances in Space Research, 1997
Abstract The initial, main and recovery stages of three magnetic storms that occurred during March 1990, June 1991 and November 1993 are discussed in terms of the response of the ionosphere as measured by Digisondes in the polar, high latitude and equatorial regions.
James L. Scali, Bodo.W. Reinisch
openaire   +1 more source

Automatic Scaling of Digisonde Ionograms Test and Evaluation Report.

1982
Abstract : Ionograms contain as basic information the virtual range versus frequency. The Digisonde 128PS also measures amplitude, phase, polarization, incidence angle and the spectral signature of the echoes. This allows automatic scaling of the ionograms and conversion to vertical electron density profiles. This report discusses the automatic scaling
Robert R. Gamache, Jane S. Tang, Bodo W. Reinisch   +2 more
openaire   +1 more source

DINData: A Windows software to reformat and clean digisonde numeric dataset

2022
The ionospheric numerical ionogram dataset on the Digisonde Ionogram Database (DIDBase) hosted by the Global Ionospheric Radio Observatory (GIRO) provides an important opportunity to study the bottomside ionospheric electron density profile. The study presents the description of software developed for digisonde numerical dataset that can be obtained ...
Saeed Abioye Bello, K A Yusuf, S O Ige, O A Joseph, L D Oluwafemi, Mardina Abdullah, Nurul Shazana Abdul Hamid   +6 more
openaire   +1 more source

Vertical electron density profiles from the Digisonde network

Advances in Space Research, 1996
Abstract The global Digisonde network provides a vast volume of ionogram-derived electron density profile data from some 50 stations. The current true height inversion program NHPC differs significantly from the original algorithms developed for real time calculation on PC 286 machines. NHPC successfully inverts about 90% of the autoscaled ionograms.
Xueqin Huang, B.W. Reinisch
openaire   +1 more source

Sporadic E tidal variabilities and characteristics observed with the Cyprus Digisonde

Journal of Atmospheric and Solar-Terrestrial Physics, 2014
Abstract In this study, ionogram observations made with the Cyprus digisonde (35°N; 33°E) are analyzed by applying an ionosonde height–time–intensity (HTI) methodology. The aim is to study dominant periodicities and diurnal patterns in occurrence and altitude transport of sporadic E (Es) and intermediate descending layers (IDL), which are impacted ...
Christina Oikonomou, Haris Haralambous, Christos Haldoupis, Chris Meek   +3 more
openaire   +1 more source

Digisonde 256 RF Power Tests at Wallops Island.

1986
Abstract : A Digisonde 256 ionosonde system was operated at Wallops Island, VA for a period of two weeks at transmitter power levels ranging from 30 watts to 7 k Watts. This data and the analysis contained in the report should determine for mid-latitude users, the minimum power required to make acceptable measurements.
openaire   +1 more source