Results 11 to 20 of about 2,078,180 (298)

Spectra of Acoustic-Gravity Waves in the Atmosphere with a Quasi-Isothermal Upper Layer

open access: yesAtmosphere, 2021
In this paper, we study, in theoretical terms, the structure of the spectrum of acoustic-gravity waves (AGWs) in the nonisothermal atmosphere having asymptotically constant temperature at high altitudes.
Sergey P. Kshevetskii   +2 more
doaj   +2 more sources

Sublimation of ice particles from rocket exhausts in the upper atmosphere [PDF]

open access: yes, 2003
The process of sublimation of ice particles from a rocket exhaust in the upper atmosphere is examined. Heating by solar radiation and losses of energy by means thermal radiation and sublimation are taken into account in the thermal balance of the ice ...
Kosch, Mike J., Platov, Y. V.
core   +4 more sources

Flood monitoring and damage assessment using water indices: A case study of Pakistan flood-2012

open access: yesEgyptian Journal of Remote Sensing and Space Sciences, 2015
This paper uses Normalized Difference Water Index (NDWI) of McFeeters (1996), Water Index (WI) introduced by Rogers and Kearney (2004), referred to as Red and Short Wave Infra-Red (RSWIR) and WI suggested as the best by Ji et al.
Akhtar Ali Memon   +3 more
doaj   +1 more source

A newly-developed system for countinuous measurements of atmospheric CO2 concentration at Syowa Station, Antarctica

open access: yesAntarctic Record, 1984
A new apparatus for in situ continuous measurements of atmospheric CO_2 concentration at Syowa Station, Antarctica was developed using a non-dispersive infrared CO_2 analyzer with a precision better than ±0.01ppm. Standard gases employed were CO_2 in air
Masayuki Tanaka   +5 more
doaj   +1 more source

Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model [PDF]

open access: yesAnnales Geophysicae, 1996
A few of the difficulties in accurately modelling high-latitude electron densities with a large-scale numerical model of the thermosphere and ionosphere are addressed by comparing electron densities calculated with the Coupled Thermosphere-Ionosphere ...
J. Schoendorf   +2 more
doaj   +1 more source

Sensitivity of the 4–10-Day Planetary Wave Structures in the Middle Atmosphere to the Solar Activity Effects in the Thermosphere

open access: yes, 2022
Numerical simulation of the general atmospheric circulation was performed to estimate changes in amplitudes of the westward-travelling planetary waves (PWs) at altitudes from the Earth’s surface up to 300 km under different solar activity (SA ...
Elena N. Savenkova   +4 more
core   +1 more source

Landuse and Community-Based Assessment of 2014 Flood Damages in Tehsil Phalia, Punjab

open access: yesInternational Journal of Economic and Environment Geology, 2020
In this study the response and feedback from the flood-hit community of Phalia (Mandi Bahauddin) obtained through local interviews and filling of questionnaires have been analyzed.
Sikandar Hussain, Anum Liaqut, Saima Siddiqui, Isma Younes, Muhammad Shafiq
doaj   +1 more source

Using Multi-Mission Satellite Elevation Data for Delineation of Gilgit Watershed in Pakistan in Geographical Information Technology Environment

open access: yesInternational Journal of Economic and Environment Geology, 2020
The hydro-climatological variations in Gilgit watershed of Upper Indus basin is less scientifically understood due to diverse geography, remoteness of the region and larger variations in climatic conditions. Extraction of catchments at multiple scales is
Muhammad Shafiq, Muhammad Irfan, Mehrab Khan
doaj   +1 more source

Segmentation of PMSE Data Using Random Forests

open access: yesRemote Sensing, 2022
EISCAT VHF radar data are used for observing, monitoring, and understanding Earth’s upper atmosphere. This paper presents an approach to segment Polar Mesospheric Summer Echoes (PMSE) from datasets obtained from EISCAT VHF radar data. The data consist of
Dorota Jozwicki   +3 more
doaj   +1 more source

Resonant Scattering by Excited Gaseous Components as an Indicator of Ionization Processes in the Atmosphere

open access: yes, 2023
The results of lidar sensing of the atmosphere at altitudes in the range of 25–600 km from the Kamchatka Lidar Station (53° N, 158° E) obtained in 2008–2022 are presented.
Vasily Bychkov
core   +1 more source

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