Results 21 to 30 of about 91,143 (269)
COSMO-97, 1998 The current cosmological constraints on a dark matter axion are reviewed. We describe the basic mechanisms by which axions are created in the early universe, both in the standard thermal scenario in which axion strings form and in inflationary models. In the thermal scenario, the dominant process for axion production is through the radiative decay of ...
Shellard, E. P. S., Battye, R. A.
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Das Questões, 2021 This poem takes the form of an ode to a speck of cosmic dust, tracking its journey across deep time and orbital space to its encounter with a living Earth.
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Scholarpedia, 2015 This article, written for Scolarpedia, provides a brief introduction into the subject of cosmic strings, together with a review of their main properties, cosmological evolution and observational signatures.
Tanmay Vachaspati +2 more
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A review on natural background radiation
Advanced Biomedical Research, 2013 The world is naturally radioactive and approximately 82% of human-absorbed radiation doses, which are out of control, arise from natural sources such as cosmic, terrestrial, and exposure from inhalation or intake radiation sources.
Daryoush Shahbazi-Gahrouei +2 more
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Ionospheric correction of GPS radio occultation data in the troposphere [PDF]
Atmospheric Measurement Techniques, 2016 For inversions of the GPS radio occultation (RO) data in the neutral atmosphere, this study investigates an optimal transition height for replacing the standard ionospheric correction using the linear combination of the L1 and L2 bending angles with the ...
Z. Zeng +5 more
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Cosmic Influence on the Sun-Earth Environment
Sensors, 2008 SOHO satellite data reveals geophysical changes before sudden changes in the Earth's Sun-Earth environment. The influence of extragalactic changes on the Sun as well as the Sun-Earth environment seems to be both periodic and episodic.
Saumitra Mukherjee
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Atmospheric GNSS RO 1D-Var in Use at UCAR: Description and Validation
Remote Sensing, 2022 This paper describes, along with some validation results, the one-dimensional variational method (1D-Var) that is in use at the University Corporation for Atmospheric Research (UCAR) to retrieve atmospheric profiles of temperature, pressure, and humidity
Tae-Kwon Wee +4 more
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Monthly Notices of the Royal Astronomical Society, 2007 The cosmological principle, promoting the view that the universe is homogeneous and isotropic, is embodied within the mathematical structure of the Robertson-Walker (RW) metric. The equations derived from an application of this metric to the Einstein Field Equations describe the expansion of the universe in terms of comoving coordinates, from which ...
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Remote Sensing, 2019 With the accumulation of the ionospheric radio occultation (IRO) data observed by Global Navigation Satellite System (GNSS) occultation sounder (GNOS) onboard FengYun-3C (FY3C) satellite, it is possible to use GNOS IRO data for ionospheric climatology ...
Weihua Bai +18 more
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Space Weather, 2023 FORMOSAT‐7/COSMIC‐2 is the largest equatorial multi‐satellite constellation of six full‐size satellites to study the equatorial ionosphere. Each satellite is equipped by an ion velocity meter (IVM) instrument to provide high rate in situ plasma density ...
Irina Zakharenkova +3 more
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