Results 21 to 30 of about 723 (151)

Optimal Estimation Inversion of Ionospheric Electron Density from GNSS-POD Limb Measurements: Part II-Validation and Comparison Using NmF2 and hmF2

Remote Sensing, 2023
A growing number of SmallSat/CubeSat constellations with high-rate (50–100 Hz) global navigation satellite system radio occultations (GNSS-RO) as well as low-rate (1 Hz) precise orbit determination (GNSS-POD) limb-viewing capabilities provide ...
Nimalan Swarnalingam, Dong L. Wu, Daniel J. Emmons, Robert Gardiner-Garden   +3 more
doaj   +1 more source

Investigation of the Topside Ionosphere over Cyprus and Russia Using Swarm Data

Remote Sensing, 2023
Using the topside electron density (Ne) measurements recorded over Cyprus and Russia, we investigate the latitudinal variation in the topside electron density during the interval 2014–2020, encompassing a period of high-to-low solar activity.
Haris Haralambous, Krishnendu Sekhar Paul, Arun Kumar Singh, Tamara Gulyaeva   +3 more
doaj   +1 more source

GNSS and Digisonde sporadic-E maps produced by Air Force Institute of Technology

, 2022
Spatial maps of sporadic-E are produced by combining COSMIC-2 RO data with Digisonde measurements, using the S4-based approach described by Carmona et al. (2022). Images from the TEC-based approach used in other studies are also included for reference.
Dan Emmons
core   +1 more source

Comprehensive analysis of the ionospheric response to the largest geomagnetic storms from solar cycle 24 over Europe

Frontiers in Astronomy and Space Sciences, 2023
A multi-instrumental analysis of the meridional ionospheric response is presented over Europe during the two largest ICME-driven geomagnetic storms of solar cycle #24 maximum.
K. A. Berényi, K. A. Berényi, K. A. Berényi, B. Heilig, B. Heilig, J. Urbář, D. Kouba, Á. Kis, V. Barta   +8 more
doaj   +1 more source

Ionospheric drift measurements with ionosondes

Annals of Geophysics, 1998
In the last forty years many attempts have been made to measure ionospheric plasma motions with HF radio sounders, generally specialized ionosondes. Starting in the 1950's, the so-called similar fading and the correlation methods were applied to estimate
D. L. Haines, J. L. Scali, B. W. Reinisch   +2 more
doaj   +1 more source

Real time monitoring for nowcasting and forecasting ionospheric space weatherin Europe with ground digisondes

Annals of Geophysics, 2005
The Earth's ionosphere largely determines space weather effects on radio wave communications, navigation and surveillance systems. Lately there has been an increasing demand for ionospheric nowcast and accurate forecast services by various ...
A. Belehaki
doaj   +1 more source

Automated collection and dissemination of ionospheric data from the digisonde network [PDF]

Advances in Radio Science, 2005
Abstract. The growing demand for fast access to accurate ionospheric electron density profiles and ionospheric characteristics calls for efficient dissemination of data from the many ionosondes operating around the globe. The global digisonde network with over 70 stations takes advantage of the Internet to make many of these sounders remotely ...
B.W. Reinisch, I. A. Galkin, G. Khmyrov, A. Kozlov, D. Kitrosser   +4 more
openaire   +2 more sources

Monitoring and investigating space weather effects with meridional chain of instruments in Yakutia: a brief overview

Solar-Terrestrial Physics, 2017
The Yakutsk Meridional Chain (YMC) of IKFIA SB RAS, located along the 190° magnetic meridian, is equipped with geophysical and radiophysical instruments for monitoring space weather in northeast-ern Russia.
Baishev D.G., Samsonov S.N., Moiseev A.V., Boroyev R.N., Stepanov A.E., Kozlov V.I., Korsakov A.A., Toropov A.A., Yoshikawa A., Yumoto K.   +9 more
doaj   +1 more source

Gravity wave initiation of equatorial spread F/plasma bubble irregularities based on observational data from the SpreadFEx campaign [PDF]

Annales Geophysicae, 2009
The data from ground based experiments conducted during the 2005 SpreadFEx campaign in Brazil are used, with the help of theoretical model calculations, to investigate the precursor conditions, and especially, the role of gravity waves, in the ...
M. A. Abdu, E. Alam Kherani, I. S. Batista, E. R. de Paula, D. C. Fritts, J. H. A. Sobral   +5 more
doaj   +1 more source

Comparison of Seasonal foEs and fbEs Occurrence Rates Derived from Global Digisonde Measurements [PDF]

, 2021
A global climatology of sporadic-E occurrence rates (ORs) based on ionosonde measurements is presented for the peak blanketing frequency, fbEs, and the ordinary mode peak frequency of the layer, foEs.
Nava, Omar A., Merriman, Dawn K., Dao, Eugene V., Emmons, Daniel J., II, Omar A. Nava, Dawn K. Merriman, Eugene V. Dao, Daniel J. Emmons   +7 more
core   +2 more sources