Results 1 to 10 of about 2,718,616 (303)

Diagnostics of HF radio channel: based on data from backscatter ionospheric sounding by continuous chirp signal

Solar-Terrestrial Physics, 2018
Backscatter ionospheric sounding (BIS) is a powerful tool for monitoring and predicting conditions of operation of HF communication systems. The BIS method is adopted to determine coverage areas of radio waves and maximum usable radio frequencies ...
Ponomarchuk S.N., Grozov V.P., Kotovich G.V., Kurkin V.I., Penzin M.S.   +4 more
doaj   +1 more source

Long-lived meteor trails

Solar-Terrestrial Physics, 2019
The paper presents data on long-lived (~20–40 min) meteor trails. We describe a group of soliton-type meteor trails expanding at transonic speeds. Radio sounding data evidences that the latter include ~7–8 min ionization trails.
Mikhalev A.V., Beletsky A.B., Vasilyev R.V., Eselevich M.V., Ivanov K.I., Komarova E.S., Podlesnyi A.V., Podlesny S.V., Syrenova T.E.   +8 more
doaj   +1 more source

Photometrical observations and shape modeling of space debris in medium Earth orbits

Solar-Terrestrial Physics
The circular medium Earth orbits with a period of about half a day in the inclination range from 50° to 70° are used by various global navigation satellite systems (GNSS), such as GLONASS, GPS, Beidou, Galileo.
Korobtsev I. V., Mishina M. N., Karavaev Y. S., Eselevich M. V., Goryashin V. E.   +4 more
doaj   +1 more source

Effects of the May 10–13, 2024 magnetic storm in the Asian region of Russia from ionospheric sounding with a continuous chirp signal

Solar-Terrestrial Physics
Effects of the May 10–13, 2024 extreme magnetic storm in the Asian region of Russia have been studied using experimental data from vertical and oblique sounding of the ionosphere with a continuous chirp signal.
Ponomarchuk Sergey, Zolotukhina Nina, Kurkin Vladimir, Belinskaya Anastasiya, Grozov Viktor, Oinats Aleksey, Poddelsky Aleksey, Podlesnyi Aleksey, Cedrik Mark   +8 more
doaj   +1 more source

Solar physics with the Virtual Solar Observatory [PDF]

Proceedings of the International Astronomical Union, 2006
The Virtual Solar Observatory (VSO) is a lightweight web service unifying twelve major solar data archives. With the VSO, users can simultaneously search for data from 50 space- and ground-based instruments covering the time period from 1915 to the present.
openaire   +1 more source

Improving the global Total Electron Content maps provided by the Ionosphere Monitoring and Prediction Center – preliminary results

Journal of Space Weather and Space Climate
Total electron content (TEC) maps are essential for understanding the temporal and spatial variability of the ionosphere, which is of particular importance during the current solar cycle with its multitude of extreme space weather events.
Schmölter Erik, Tagargouste Youssef, Wilken Volker, Kriegel Martin, Berdermann Jens   +4 more
doaj   +1 more source

Backscattering dynamics during intense geomagnetic storm as deduced from Yekaterinburg radar data: March 17–22, 2015

Solar-Terrestrial Physics, 2016
This paper examines the spatio-temporal dynamics of backscattering signals during St. Patrick’s Day two-step intense geomagnetic storm from the Yekaterinburg Coherent Radar (YeKB radar) data.
Zolotukhina N.A., Kurkin V.I., Polekh N.M., Romanova E.B.   +3 more
doaj   +1 more source

Solar Physics—the Chemistry of the Sun 1 [PDF]

Nature, 1881
n ...
openaire   +6 more sources

Solar Physics

, 2019
Daily full-disk observations of the solar photosphere and chromo-sphere started at Meudon Observatory in 1908. After a review of the scientific context and the historical background, we describe the instrumental characteristics and capabilities of the new version operating since 2018.
Dalmasse, K., Malherbe, J.-M.
openaire   +2 more sources

Astroparticle physics with solar neutrinos

Proceedings of the Japan Academy, Series B, 2011
Solar neutrino experiments observed fluxes smaller than the expectations from the standard solar model. This discrepancy is known as the "solar neutrino problem". Flux measurements by Super-Kamiokande and SNO have demonstrated that the solar neutrino problem is due to neutrino oscillations.
openaire   +3 more sources