Results 1 to 10 of about 902,895 (113)

Venus Express radio occultation observed by PRIDE [PDF]

A&A 624, A59 (2019), 2019
Context. Radio occultation is a technique used to study planetary atmospheres by means of the refraction and absorption of a spacecraft carrier signal through the atmosphere of the celestial body of interest, as detected from a ground station on Earth.
Bocanegra-Bahamon, T. M., Calves, G. Molera, Cimo, G., Cui, L., Dirkx, D., Duev, D. A., Gurvits, L. I., Ipatov, A. V., Kharinov, M. A., Kondo, T., Li, P., Limaye, S., Lovell, J. E. J., Ma, M., McCallum, J. N., Mikhailov, A. G., Pogrebenko, S. V., Rosenblatt, P., Sekido, M., Wang, W., Zheng, W.   +20 more
arxiv   +9 more sources

A non-linear optimal estimation inverse method for radio occultation measurements of temperature, humidity and surface pressure [PDF]

, 2000
An optimal estimation inverse method is presented which can be used to retrieve simultaneously vertical profiles of temperature and specific humidity, in addition to surface pressure, from satellite-to-satellite radio occultation observations of the Earth's atmosphere.
Ahmad, Born, Cullen, Eyre, Fjeldbo, Fjeldbo, Gurvich, Healy, J. J. Barnett, J. R. Eyre, Kliore, Kuo, Kursinski, Kursinski, Lindal, Lindal, Lindal, Lorenc, Marks, Mortensen, Paul I. Palmer, Phinney, Press, Rocken, Rodgers, Rodgers, S. B. Healy, Smith, Steiner, Vorob'ev, Ware, Zou   +31 more
arxiv   +4 more sources

Ganymede's Ionosphere Observed by a Dual‐Frequency Radio Occultation With Juno

Geophysical Research Letters, 2022
In June 2021, the Juno spacecraft executed a close flyby of Ganymede. During the encounter, Juno passed behind Ganymede for 15 min as observed from Earth, providing the geometry to conduct a radio occultation experiment to probe Ganymede's tenuous ...
D. Buccino, M. Parisi, E. Gramigna, L. Gomez‐Casajus, P. Tortora, M. Zannoni, A. Caruso, R. Park, P. Withers, P. Steffes, A. Hodges, S. Levin, S. Bolton   +12 more
semanticscholar   +1 more source

Comparison of COSMIC and COSMIC-2 Radio Occultation Refractivity and Bending Angle Uncertainties in August 2006 and 2021

Atmosphere, 2022
We compare the random error statistics (uncertainties) of COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate, C1) and COSMIC-2 (C2) radio occultation (RO) bending angles and refractivities for the months of August 2006 and ...
R. Anthes, J. Sjoberg, Xuelei Feng, S. Syndergaard   +3 more
semanticscholar   +1 more source

Monitoring global climate change using GNSS radio occultation

npj Climate and Atmospheric Science, 2022
The emerging signal of climate change is now clearly evident in Global Navigation Satellite System (GNSS) radio occultation (RO) data, matching predictions made by climate models 15 years ago. The observed RO trends represent well-understood responses to
H. Gleisner, M. Ringer, S. Healy
semanticscholar   +1 more source

Accuracy assessment of the quiet-time ionospheric F2 peak parameters as derived from COSMIC-2 multi-GNSS radio occultation measurements

Journal of Space Weather and Space Climate, 2021
The Constellation Observing System for Meteorology, Ionosphere, and Climate 2 (COSMIC-2) mission was launched into a low-inclination (24°) orbit on June 25, 2019.
I. Cherniak, I. Zakharenkova, J. Braun, Qian Wu, N. Pedatella, W. Schreiner, J. Weiss, D. Hunt   +7 more
semanticscholar   +1 more source

An Analysis Study of FORMOSAT-7/COSMIC-2 Radio Occultation Data in the Troposphere

Remote Sensing, 2021
This study investigates the Global Navigation Satellite System (GNSS) radio occultation (RO) data from FORMOSAT-7/COSMIC-2 (FS7/C2), which provides considerably more and deeper profiles at lower latitudes than those from the former FORMOSAT-3/COSMIC (FS3/
Shu-Ya Chen, Chian‐Yi Liu, Ching-Yuang Huang, Shen-Cha Hsu, Hsiu-Wen Li, P. Lin, Jia-Ping Cheng, Cheng-Yung Huang   +7 more
semanticscholar   +1 more source

Sensing the ionosphere with the Spire radio occultation constellation

Journal of Space Weather and Space Climate, 2021
Radio occultation (RO) provides a cost-effective component of the overall sensor mix required to characterise the ionosphere over wide areas and in areas where it is not possible to deploy ground sensors.
Matthew James Angling, O. Nogués-Correig, V. Nguyen, Sanita Vetra-Carvalho, Francois-Xavier Bocquet, K. Nordstrom, Stacey Elizabeth Melville, G. Savastano, S. Mohanty, D. Masters   +9 more
semanticscholar   +1 more source

Jovian Auroral Radio Source Occultation Modeling and Application to the JUICE Science Mission Planning [PDF]

Planet. Space Sci., 209, 105344, 2021, 2021
Occultations of the Jovian low frequency radio emissions by the Galilean moons have been observed by the PWS instrument of the Galileo spacecraft. We show that the ExPRES (Exoplanetary and Planetary Radio Emission Simulator) code accurately models the temporal occurrence of the occultations in the whole spectral range observed by Galileo/PWS.
arxiv   +1 more source

The Shape of Jupiter and Saturn Based on Atmospheric Dynamics, Radio Occultations and Gravity Measurements [PDF]

Geophysical Research Letters, 50, e2022GL102321 (2023), 2023
The shape of the two gas giants, Jupiter and Saturn, is determined primarily by their rotation rate, and interior density distribution. It is also affected by their zonal winds, causing an anomaly of O(10 km) at low latitudes. However, uncertainties in the observed cloud-level wind and the polar radius, translate to an uncertainty in the shape with the
arxiv   +1 more source