Results 41 to 50 of about 126,100 (317)
AtmosphereThe influence of solar activity on seismic activity is a subject of debate. Previous studies have shown that there is sometimes a correlation and sometimes a contradiction between solar activity maxima and large earthquakes.
Aizhan Altaibek +4 more
doaj +1 more source
Long-Term Changes and Trends in the F2 Layer Critical Frequency over Alma-Ata (Kazakhstan)
AtmosphereThe long-term variability and trends in the F2 layer critical frequency variations over Alma-Ata [43.25 N, 77.92 E] for the period 07.1957–04.2018 are studied using near-midday, near-midnight, and hourly median foF2 values.
Galina Gordiyenko +3 more
doaj +1 more source
Winter thunderstorms in Kamchatka [PDF]
E3S Web of Conferences, 2019 Winter thunderstorms in Kamchatka are rare meteorological phenomena. To investigate the nature of this phenomenon, time variations of quasistatic electric field and meteorological quantities at «Paratunka» observatory, IKIR FEB RAS (φ = 52:97° N; λ = 158:
Smirnov Sergey +3 more
doaj +1 more source
Single band VLBI absolute astrometry [PDF]
, 2022 The ionospheric path delay impacts single-band very long baseline interferometry (VLBI) group delays, which limits their applicability for absolute astrometry. I consider two important cases: when observations are made simultaneously at two bands, but delays at only one band are available for a subset of observations and when observations are made at ...
arxiv +1 more source
Effects Of The Ionosphere On Ground-Based Detection Of The Global 21 CM Signal From The Cosmic Dawn And The Dark Ages [PDF]
, 2016 Detection of the global HI 21 cm signal from Cosmic Dawn and Epoch of Reionization is the key science driver for several ongoing ground-based and future ground/space-based experiments.
Bradley, Richard +5 more
core +2 more sources
Synchronous NmF2 and NmE daytime variations as a key to the mechanism of quiet-time F2-layer disturbances [PDF]
Annales Geophysicae, 2007 The observed NmF2 and NmE variations were analyzed for the periods of positive and negative quiet-time F2-layer disturbances (Q-disturbances) observed in the midlatitude daytime F2-layer to specify the mechanism of their origin. The noontime δNmF2 and
A. V. Mikhailov +2 more
doaj +1 more source
Atmosphere, 2021 The ionospheric weather is affected not only from above by the Sun but also from below by processes in the lower-lying atmospheric layers. One of the most pronounced atmospheric phenomena is the sudden stratospheric warming (SSW).
Zbyšek Mošna +6 more
doaj +1 more source
Elderly care monitoring system with IoT application [PDF]
, 2020 Falls among elderly can pose serious consequences such as injury or even fatal ones. Therefore, it is essential that fall are detected early and away to that is by using IoT platform.
Abd Wahab, Mohd Helmy +3 more
core +1 more source
Determination of the perturbations in the ionosphere produced by tsunamis through GNSS observations [PDF]
arXiv, 2023 During the propagation of a tsunami, gravity and sound waves can be produced, spreading from its source to the ionosphere's upper layers, thus generating perturbed electron densities in its E and F regions. These ionospheric disturbances can be studied in detail using measurements of the ionosphere's Total Electron Content (TEC), registered by ...
arxiv
Ionospheric Power-Spectrum Tomography in Radio Interferometry
, 2010 A tomographic method is described to quantify the three-dimensional power-spectrum of the ionospheric electron-density fluctuations based on radio-interferometric observations by a two-dimensional planar array.
Born +14 more
core +2 more sources