Results 1 to 10 of about 14,356 (303)

GPS Radio Occultation with CHAMP

, 2003
The GPS (Global Positioning System) radio occultation experiment onboard the German CHAMP (CHAllenging Minisatellite Payload) satellite was activated in February 2001. By the end of 2001 about 36,500 occultations were recorded. We review the occultation data processing at the GFZ and discuss selected first results.
Wickert, J., Beyerle, G., Schmidt, T., Marquardt, C., König, R., Grunwaldt, L., Reigber, C.   +6 more
openaire   +3 more sources

Method for remotely sensing turbulence of planetary atmospheres [PDF]

, 1974
Based on variances of log-amplitude and phase fluctuations of radio occultation data received from orbital and fly-by missions, structure constant for Venusian planetary atmosphere has been estimated with high-confidence factor.
Ishimaru, A., Woo, R. T.
core   +1 more source

Ooty Occultations of 76 radio sources

The Astronomical Journal, 1974
Positional and structural information derived from lunar occultations observed at 327 MHz is presented for 76 radio sources, most of them of flux density less than 2×10 -26 Wm -2 Hz -1 . Only 16 sources are optically identified. Two of the stronger sources in the list, viz. PKS 1417-19 and MSH 16-205 have a head-tail type of radio structure.
Vijay K. Kapahi, Mohan N. Joshi, N. V. G. Sarma   +2 more
openaire   +1 more source

Radio frequency science considerations [PDF]

, 1974
Use of the 400 MHz telecommunications system to obtain scientific information, to provide backup information for the experiments flown, and to obtain measurements which aid in designing future probes is considered.
Croft, T. A.
core   +1 more source

Investigation of the small-scale structure and dynamics of Uranus' atmosphere [PDF]

This document constitutes the final technical report of the Uranus Analysis Program. Papers and/or abstracts resulting from this research are presented.
Eshleman, Von R., Hinson, David P.
core   +1 more source

Comparison of Different Neural Network Approaches for the Tropospheric Profiling over the Inter-tropical lands Using GPS Radio Occultation Data

Algorithms, 2009
In this study different approaches based on multilayer perceptron neural networks are proposed and evaluated with the aim to retrieve tropospheric profiles by using GPS radio occultation data.
Stefania Bonafoni, Fabrizio Pelliccia, Roberta Anniballe   +2 more
doaj   +1 more source

An X-ray measurement of Titan's atmospheric extent from its transit of the Crab Nebula [PDF]

, 2004
Saturn's largest satellite, Titan, transited the Crab Nebula on 5 January 2003. We observed this astronomical event with the {\it Chandra} X-ray Observatory.
Albert E. Metzger, David N. Burrows, Gordon P. Garmire, Haruyoshi Katayama, Hiroshi Tsunemi, Koji Mori, Smith G. R.   +6 more
core   +2 more sources

Initial performance of the radio occultation experiment in the Venus orbiter mission Akatsuki

Earth, Planets and Space, 2017
After the arrival of Akatsuki spacecraft of Japan Aerospace Exploration Agency at Venus in December 2015, the radio occultation experiment, termed RS (Radio Science), obtained 19 vertical profiles of the Venusian atmosphere by April 2017.
Takeshi Imamura, Hiroki Ando, Silvia Tellmann, Martin Pätzold, Bernd Häusler, Atsushi Yamazaki, Takao M. Sato, Katsuyuki Noguchi, Yoshifumi Futaana, Janusz Oschlisniok, Sanjay Limaye, R. K. Choudhary, Yasuhiro Murata, Hiroshi Takeuchi, Chikako Hirose, Tsutomu Ichikawa, Tomoaki Toda, Atsushi Tomiki, Takumi Abe, Zen-ichi Yamamoto, Hirotomo Noda, Takahiro Iwata, Shin-ya Murakami, Takehiko Satoh, Tetsuya Fukuhara, Kazunori Ogohara, Ko-ichiro Sugiyama, Hiroki Kashimura, Shoko Ohtsuki, Seiko Takagi, Yukio Yamamoto, Naru Hirata, George L. Hashimoto, Manabu Yamada, Makoto Suzuki, Nobuaki Ishii, Tomoko Hayashiyama, Yeon Joo Lee, Masato Nakamura   +38 more
doaj   +1 more source

Manned Mars mission sunlight and communication occultations [PDF]

Calculations are presented for the 1999 opposition class mission and a procedure for obtaining singlar occultation data for any other given Mars mission is given.
Mulqueen, Jack
core   +1 more source

Earth Occultation Imaging of the Low Energy Gamma-Ray Sky with GBM

, 2014
The Earth Occultation Technique (EOT) has been applied to Fermi's Gamma-ray Burst Monitor (GBM) to perform all-sky monitoring for a predetermined catalog of hard X-ray/soft gamma-ray sources.
Camero-Arranz, A., Case, G. L., Chaplin, V., Cherry, M. L., Finger, M. H., Jenke, P., Rodi, J., Wilson-Hodge, C. A.   +7 more
core   +1 more source