Results 21 to 30 of about 35,368 (282)

Radio occultation techniques for probing the ionosphere

Annals of Geophysics, 2004
GPS radio occultation measurements establish the basis for a new remote sensing technique for vertical profile information on the electron density of the entire ionosphere from satellite orbit heights down to the bottomside.
M. Angling, R. Leitinger, N. Jakowski
doaj   +1 more source

Application of Beamforming Technology in Ionospheric Oblique Backscatter Sounding with a Miniaturized L-Array

Remote Sensing, 2020
In this paper, a new dedicated multi-channel ionospheric oblique backscatter sounder is described. A miniaturized L-shaped antenna array was employed for the receiving of the oblique backscatter echoes in the present system. Firstly, two typical adaptive
Tongxin Liu, Guobin Yang, Zhengyu Zhao, Chunhua Jiang, Yaogai Hu   +4 more
doaj   +1 more source

Long-distance HF radio waves propagation during the April 2023 geomagnetic storm by measurements in Antarctica, in Europe, and aboard RV Noosfera

Український антарктичний журнал, 2023
The paper aims at an experimental study of the mechanisms of long-distance high-frequency (HF) propagation and spatial and temporal variations of the ionospheric parameters during the first hours of a severe geomagnetic storm of April 23, 2023 by ...
A. Zalizovski, Y. Yampolski, I. Stanislawska, O. Koloskov, O. Budanov, O. Bogomaz, B. Gavrylyuk, A. Sopin, A. Reznychenko, A. Kashcheyev, S. Kashcheyev, V. Lisachenko   +11 more
doaj   +1 more source

Vertical and oblique ionospheric soundings over a very long multihop HF radio link from polar to midlatitudes: Results and relationships [PDF]

Radio Science, 2009
A vertical incidence sounder (VIS) was installed at the Spanish Antarctic Base (62.7°S, 299.6°E) during the Antarctic summer survey 2004–2005. In addition, an oblique sounding (OS) system for HF communications between Antarctica and Spain (12,700 km) has been operated during the Antarctic summers since December 2003.
C. Vilella, D. Miralles, D. Altadill, F. Acosta, J. G. Solé, J. M. Torta, J. L. Pijoan   +6 more
openaire   +3 more sources

Determination and climatology of the planetary boundary layer height above the Swiss plateau by in situ and remote sensing measurements as well as by the COSMO-2 model [PDF]

Atmospheric Chemistry and Physics, 2014
The planetary boundary layer (PBL) height is a key parameter in air quality control and pollutant dispersion. The PBL height cannot, however, be directly measured, and its estimation relies on the analysis of the vertical profiles of the temperature ...
M. Collaud Coen, C. Praz, A. Haefele, D. Ruffieux, P. Kaufmann, B. Calpini   +5 more
doaj   +1 more source

Propagation of gravity waves and spread F in the low-latitude ionosphere over Tucumán, Argentina, by continuous Doppler sounding: first results [PDF]

, 2014
Results of systematic analysis of propagation directions and horizontal velocities of gravity waves (GWs) and spread F structures in low-latitude ionosphere (magnetic inclination ~27°) in Tucumán region, Argentina, are presented.
Baše, J., Burešová, D., Cabrera, M. A., Cangemi, José Ignacio, Chum, J., Ezquer, Rodolfo Gerardo, Fišer, J., Hruška, F., Ise, Juan Eduardo, Laštovička, J., Miranda Bonomi, Fernando Alberto, Molina, Maria Graciela, Šindelářová, T.   +12 more
core   +2 more sources

Microwave spectroscopy of the Mars atmosphere [PDF]

, 1995
A study of the use of millimeter-wavelength spectral transitions to investigate the atmosphere of Mars is presented. In the model experiments investigated it is assumed that a spectrometer in the frequency range from 100 to 260 GHz looks into a modest ...
Clancy, R. T., Muhleman, D. O.
core   +1 more source

Ionospheric Narrowband and Wideband HF Soundings for Communications Purposes: A Review

Sensors, 2020
High Frequency (HF) communications through ionospheric reflection is a widely used technique specifically for maritime, aeronautical, and emergency services communication with remote areas due to economic and management reasons, and also as backup system.
Marcos Hervás, Pau Bergadà, Rosa Ma Alsina-Pagès   +2 more
doaj   +1 more source

GPS radio occultation with CHAMP and GRACE: A first look at a new and promising satellite configuration for global atmospheric sounding [PDF]

Annales Geophysicae, 2005
CHAMP (CHAllenging Minisatellite Payload) and GRACE (Gravity Recovery And Climate Experiment) formed a satellite configuration for precise atmospheric sounding during the first activation of the GPS (Global Positioning System) radio occultation ...
J. Wickert, G. Beyerle, R. König, S. Heise, L. Grunwaldt, G. Michalak, Ch. Reigber, T. Schmidt   +7 more
doaj   +1 more source

Orographic and convective gravity waves above the Alps and Andes mountains during GPS radio occultation events – a case study [PDF]

, 2017
The significant distortions introduced in the measured atmospheric gravity wavelengths by soundings other than in vertical and horizontal directions, are discussed as a function of elevation angle of the sounding path and the gravity waves aspect ratio ...
Alexander, Pedro Manfredo, Cremades, Pablo Gabriel, de la Torre, Alejandro, Hierro, Rodrigo Federico, Llamedo Soria, Pablo Martin, Steiner, Andrea K.   +5 more
core   +1 more source