Results 231 to 240 of about 184,127 (275)

Spaceborne P-Band SAR Imaging Degradation by Anisotropic Ionospheric Irregularities: A Comprehensive Numerical Study

IEEE Transactions on Geoscience and Remote Sensing, 2020
There has been a burgeoning prospect in developing a spaceborne P-band synthetic aperture radar (SAR) mission for its stronger penetrability through foliage and subsurface than the higher-frequency system.
Yifei Ji, Qilei Zhang, Yongsheng Zhang, Z. Dong, Baidong Yao   +4 more
semanticscholar   +1 more source

Robust Detection of Ionospheric Irregularities

Navigation, 2001
The approach outlined in this paper conservatively bounds the ionospheric errors even for the worst observed ionospheric conditions to date, using data sets taken from the operational receivers in the WAAS reference station network.
Todd Walter, Andrew Hansen, Juan Blanch, Per Enge, Tony Mannucci, Xiaoqing Pi, Larry Sparks, Byron Iijima, Bakry El-Arini, Roland Lejeune, Mine Hagen, Eric Altshuler, Rob Fries, Aleck Chu   +13 more
openaire   +1 more source

Ionospheric irregularities detected by GEONET

2020
<p>Ionospheric irregularities disrupt the propagation of radio waves in the frequency range below a few GHz, a band used by navigation and communication systems such as Global Navigation Satellite System (GNSS). Detailed understanding of the irregularity characteristics is helpful to estimate potential degradation of the ...
Guanyi Ma, Qi Li, Takashi Maruyama, Jinghua Li, Qingtao Wan, Jiangtao Fan, Xiaolan Wang, Jie Zhang   +7 more
openaire   +1 more source

Irregularities in the upper ionosphere

Planetary and Space Science, 1964
The electron density distribution in ionospheric F-region shows irregularities of dimensions ranging from less than 1 km to more than 1000 km. These have been studied as spread-F, radio star scintillation, auroral structure and other phenomena. A review of the experimental data indicates that at least in the case of spread-F there are two different ...
openaire   +1 more source

Space charge waves and ionospheric irregularities

Journal of Atmospheric and Terrestrial Physics, 1968
Abstract The dispersion of space charge waves in a partially ionized plasma is investigated mainly for transverse propagation to both applied electro- and magneto-static fields, E0 and B0 respectively. The waves consist of six modes of which five are damped and only one increases with time. The wave of this mode in low frequency travels approximately
Susumu Kato, Sadami Matsushita
openaire   +1 more source

Nonperiodic irregularities in the ionosphere

Journal of Geophysical Research, 1971
Continuous records of the electron content of the ionosphere at latitudes of 34°S and 42°S show both periodic and isolated (nonperiodic) fluctuations in approximately equal numbers. Both types have peaks of occurrence near noon and midnight, although the isolated irregularities peak 2 hours before the periodic type.
openaire   +1 more source

Modeling of tsinami-induced ionospheric irregularities

2008 IEEE Antennas and Propagation Society International Symposium, 2008
This model shows that about an hour after the tsunami takes place, the ionosphere will be perturbed via the gravity wave. The height with maximum perturbation of electron number density is near 300 km, which is also the altitude of maximum background electron density.
null Chao-Lun Mai, null Jean-Fu Kiang
openaire   +1 more source

Ionospheric Irregularities and Waves

2018
Some of the fundamental scientific questions are raised, mainly focusing on the causes of mid-latitude ionospheric irregularities and waves, the upward coupling of energy in the M-I-A system, and the thermal structure. A definition is provided for irregular behaviour with appropriate examples of LSTIDs and MSTIDs in the European mid-latitude ionosphere.
openaire   +1 more source

The Statistical Characteristics of Small‐Scale Ionospheric Irregularities Observed in the Martian Ionosphere

Journal of Geophysical Research: Space Physics, 2019
Small‐scale ionospheric irregularities in magnetic field strength and ionospheric density have recently been discovered at Mars by the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft.
C. Fowler, J. Bonnell, J. Huba, L. Andersson, J. Espley, M. Benna, R. Ergun   +6 more
semanticscholar   +1 more source

Ionospheric irregularities and radio scintillations

Contemporary Physics, 1975
(1975). Ionospheric irregularities and radio scintillations. Contemporary Physics: Vol. 16, No. 5, pp. 469-488.
openaire   +1 more source