Results 41 to 50 of about 906,411 (211)
Density fluctuation in the solar corona and solar wind: A comparative analysis of radio-occultation observations and magnetohydrodynamic simulation [PDF]
A&A 695, A192 (2025)Recent in-situ observations and numerical models indicated various types of magnetohydrodynamic (MHD) waves contributing to the solar wind acceleration. Among them is an MHD wave decomposition at distances closer than 50 $R_{\odot}$ using data taken by the first perihelion pass of Parker Solar Probe (PSP).
arxiv +1 more source
Laboratory evaluation and application of microwave absorption properties under simulated conditions for planetary atmospheres [PDF]
, 1984 The recognition of the need to make laboratory measurements of simulated planetary atmospheres over a range of temperatures and pressure which correspond to the altitudes probed by radio occultation experiments, and over a range of frequencies which ...
Steffes, P. G.
core +3 more sources
Variability of the Martian ionosphere from the MAVEN Radio Occultation Science Experiment
Earth and Planetary Physics, 2019 The Martian ionosphere is produced by a number of controlling processes, including solar extreme ultraviolet radiation (EUV) and X‐ray ionization, impact ionization by precipitating electrons, and day‐to‐night transport.
Meijuan Yao +4 more
semanticscholar +1 more source
Keck High Resolution Spectroscopy of PKS 0123+257: Intrinsic Absorption in a Radio Loud Quasar [PDF]
Astron.J.113:136-143,1997, 1996 We present results from Keck I high resolution spectroscopy of the radio loud quasar PKS 0123+257 ($z_e$=2.364, V=17.5). In this object we detect Ly$\alpha$, N V 1238,1242, Si IV 1393,1402, and C IV 1548,1550 in an absorption system at a redshift of 2.369.
arxiv +1 more source
Remote Sensing, 2019 The Global Navigation Satellite System (GNSS) Radio Occultation (RO) is a key technique for obtaining thermodynamic profiles of temperature, humidity, pressure, and density in the Earth’s troposphere.
Ying Li +6 more
semanticscholar +1 more source
Occultation of the radio source 2019+098 (3C411) by comet 1983e (Sugano-Saigusa-Fujikawa) [PDF]
arXiv, 2009 [This cometary occultation observation from June 1983 remained to be formally reported due to other preoccupations of the authors. It was presented in seminars to colleagues at Ooty, Bangalore and elsewhere. We now write it up as we have been asked about it by various colleagues at various times, and feel we owe it to them to put it firmly on record ...
arxiv
Uranus and Neptune: Shape and Rotation [PDF]
, 2010 Both Uranus and Neptune are thought to have strong zonal winds with velocities of several hundred meters per second. These wind velocities, however, assume solid-body rotation periods based on Voyager 2 measurements of periodic variations in the planets'
Anderson +29 more
core +1 more source
Atmospheric Measurement Techniques, 2018 . The Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) is one of the new-generation payloads on board the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmosphere and ...
Yueqiang Sun +14 more
semanticscholar +1 more source
Forthcoming occultations of astrometric radio sources by planets [PDF]
In: D. Behrend, K. D. Baver (Eds.), IVS 2010 General Meeting
Proc., NASA/CP-2010-215864, 2010, 320--324, 2011 Astrometric observations of the radio source occultations by solar system bodies may be of large interest for testing gravity theories, dynamical astronomy, and planetary physics. In this paper, we present an updated list of the occultations of astrometric radio sources by planets expected in the nearest years.
arxiv
Radio Occultation Bending Angle Anomalies During Tropical Cyclones [PDF]
, 2010 The tropical deep convection affects the radiation balance of the atmosphere changing the water vapor mixing ratio and the temperature of the upper troposphere lower stratosphere.
Biondi, Riccardo +3 more
core +3 more sources