Results 71 to 80 of about 93,595 (201)

From Flybys to Sample Return: A Review of Space Probes and Robotic Sampling Technologies for Small Bodies

Journal of Field Robotics, Volume 43, Issue 7, Page 4475-4514, October 2026.
ABSTRACT As a crucial puzzle piece of deep space exploration, exploring small bodies can provide significant scientific insights and valuable mineral resources. Unlike missions to the Moon and Mars, small‐body missions pose distinct technical challenges, including communication delays, weak gravity, and uncertain environments. This paper reviews a full
Xin Zhang, Hao Zhou, Dalin Zhou, Zhaojie Ju   +3 more
wiley   +1 more source

Ionospheric sounder as a means of monitoring ground moisture [PDF]

, 1969
Ionospheric sounding for monitoring effective reflection coefficient of ground ...
Wu, S. T., Fung, A. K.
core  

ELECTRON DENSITY PROFILE RECOVERY ACCURACY AND APPLICATION OF POLYNOMIAL APPROXIMATIONS IN THE FREQUENCY-AND-ANGULAR SOUNDING OF THE IONOSPHERE

Radio Physics and Radio Astronomy, 2019
Purpose: Analysis of the error in recovering the height profile of the electron density of the ionosphere by the frequency-andangular sounding technique in dependence on the accuracy of measuring vertical plane angles of arrival of the probe signals ...
V. G. Galushko
doaj   +1 more source

Dynamic Evolution of a Storm‐Time “Super‐EPB” Event Over China on the Magnetically Disturbed Night of 01 December 2023

Space Weather, Volume 24, Issue 10, October 2026.
Abstract This paper investigates the dynamic evolution of a storm‐time “Super‐EPB” event over China on 1 December 2023 (Kp ≤ 7, SYM/H ≥ −130 nT) using multi‐instrument observations. Occurring near sunset as the IMF‐Bz abruptly turned southward, with auroral extension to midlatitudes, the “Super‐EPB” extended to 40°N with an apex height of ∼2,460 km ...
Longchang Sun, Jiyao Xu, Wei Yuan, Yajun Zhu, Maosheng He, Wenjie Sun, Guozhu Li, Jiaojiao Zhang, Hong Gao, Aibin Zhang, Weijun Liu, Guojun Wang   +11 more
wiley   +1 more source

Gravity waves propagation in the thermosphere observed from electron density profile and total electron content measurements

Annals of Geophysics, 1997
Ionospheric observations with five minute intervals between ionograms were made during a campaign from 19th to 23rd June 1996 at the Rome station (41.8N, 12.5E).
C. Scotto, M. Pezzopane, L. Ciraolo, C. Bianchi, M. Anzidei   +4 more
doaj   +1 more source

Errors of ionospheric parameter diagnostics by vertical sounding method

, 2001
The problem of RMS error determination in ionospheric parameters measured by the method of vertical HF sounding is considered here. This problem is solved for the case of topside ionospheric sounding when the height distribution of electron density is ...
P F Denisenko (16041920), M P Gough (16041923), D. A. Noranovich, M. P. Gough, P. F. Denisenko, D A Noranovich (16078619), Natalia Beloff (4461595), N. Beloff   +7 more
core   +1 more source

A Frequency Selecting Method for High-Frequency Communication Based on Ionospheric Oblique Backscatter Sounding

Remote Sensing
Ionospheric oblique backscatter sounding is an effective means of monitoring the ionosphere which can be used as a frequency selection system to serve HF communication and ensure its quality and stability. But how to obtain effective information from the
Chuqi Cai, Guobin Yang, Tongxin Liu, Chunhua Jiang   +3 more
doaj   +1 more source

Nordic ionospheric sounding rocket seeding experiment (NISSE)

, 2009
The Nordic Ionospheric Sounding rocket Seeding Experiment (NISSE) is a student research project in the REXUS student rocket experiment program. The NISSE experiment flew onboard a sounding rocket, the REXUS 6, which was launched at the Esrange rocket ...
Hølland, Vidar, Tanskanen, Eija I., Vierinen, Juha, Mellemstrand, Gard, Enell, Carl-Fredrik, Pitkänen, Timo, Njåstad, S., Baumann, Gisela, Søreide, Asbjørn, Slettebakken, K., Virtanen, Ilkka I.   +10 more
core   +2 more sources

Automatic estimation of dynamics of ionospheric disturbances with 1–15 minute lifetimes as derived from ISTP SB RAS fast chirp ionosonde data

Solar-Terrestrial Physics, 2018
We propose and test a method of analyzing ionograms of vertical ionospheric sounding, which is based on detecting deviations of the shape of an ionogram from its regular (averaged) shape.
Berngardt O.I., Bubnova T.V., Podlesnyi A.V.   +2 more
doaj   +1 more source

Non linear sounding of the ionospheric plasma

Geophysical Research Letters, 1977
This paper describes the observation of a ionospheric resonant wave‐wave interaction experiment. The unsolved physical questions, raised by these experiments, and their geophysical implications are presented.
J. Lavergnat, P. Bauer, J. Y. Delahaye, R. Ney   +3 more
openaire   +1 more source