Results 11 to 20 of about 53,020 (220)
Behaviour of electron content in the ionospheric d-region during solar x-ray flares [PDF]
, 2016 One of the most important parameters in ionospheric plasma research also having a wide practical application in wireless satellite telecommunications is the total electron content (TEC) representing the columnal electron number density. The F region with
M. Drakul +5 more
semanticscholar +1 more source
Some studies on low-frequency signal in relation to X-ray flares and climatic conditions [PDF]
Annales Geophysicae, 1994 The statistical behaviour of the sudden enhancement in signal strength (SES) in relation to solar X-ray flares has been studied for the near east-west propagation of 40 kHz radio waves from Sanwa (36°11'N; 139°51'E) in Japan to Calcutta (22°34'N; 88 ...
S. K. Sarkar, B. K. De
doaj +1 more source
The existence of hot X-ray onsets in solar flares [PDF]
Astronomy & Astrophysics, 2023 It is well known among the scientific community that solar flare activity often begins well before the main impulsive energy release. Our aim is to investigate the earliest phase of four distinct flares observed by Solar Orbiter/STIX and determine the ...
A. Battaglia +11 more
semanticscholar +1 more source
Solar X-ray flare hazards on the surface of Mars [PDF]
Planetary and Space Science, 2007 Putative organisms on the Martian surface would be exposed to potentially high doses of ionizing radiation during strong solar X-ray flares. We extrapolate the observed flare frequency-energy release scaling relation to releases much larger than seen so far for the sun, an assumption supported by observations of flares on other solar- and subsolar-mass
Smith, David S., Scalo, John M.
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The Periodic and Temporal Behaviors of Solar X-Ray Flares in Solar Cycles 23 and 24
Astrophysical Journal, 2019 The recent solar cycles 23 and 24 are thought to be unusually quiet with more prolonged periods. Both sunspot groups and solar soft X-ray (SXR) flares show a decline in numbers comparable to cycles 21 and 22.
Jacob Oloketuyi, Yu Liu, Mingyu Zhao
semanticscholar +1 more source
X-Ray Polarization of Solar Flares Measured with Rhessi [PDF]
Solar Physics, 2006 The degree of linear polarization in solar flares has not yet been precisely determined despite multiple attempts to measure it with different missions. The high energy range in particular has very rarely been explored, due to its greater instrumental difficulties.
Suarez-Garcia, E. +6 more
openaire +3 more sources
The First AGILE Solar Flare Catalog
The Astrophysical Journal Supplement Series, 2023 We report the Astro-rivelatore Gamma a Immagini LEggero (AGILE) observations of solar flares, detected by the onboard anticoincidence system in the 80–200 keV energy range, from 2007 May 1 to 2022 August 31. In more than 15 yr, AGILE detected 5003 X-ray,
A. Ursi +11 more
doaj +1 more source
Remote Sensing, 2022 This work proposes a new indirect method to detect the impact of solar flares on ionospheric sounding measurements, i.e., on the signal-to-noise ratio of ionospheric reflected radio signals. The method allows us to detect and characterize the ionospheric
Victor de Paula +4 more
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Space Weather, 2018 Increased electron density in the ionosphere due to photoionization by radiation emitted during a solar X‐ray flare impacts high‐frequency (HF) radio wave propagation.
R. Fiori +6 more
semanticscholar +1 more source
Strong influence of solar X-ray flares on low-frequency electromagnetic signals in middle latitudes
Annals of Geophysics, 2019 . In this paper we analysed sudden phase anomalies (SPAs) of VLF–LF signals recorded at Graz (Austria), Birr (Ireland) and Moscow (Russia) stations during two strong solar flares in September 2017.
A. Rozhnoi +7 more
semanticscholar +1 more source