Results 71 to 80 of about 11,370 (181)

Spectral Observation of Solar Photosynthetically Active Radiation on Clear Days in Qinghai-Xizang Plateau

Gaoyuan qixiang
Photosynthetically Active Radiation （PAR） spectrum， in visible light， is the wavelength range sensitive to plants and can be absorbed by them for photosynthesis.The characteristics of ground PAR spectrum directly affect the growth， development ...
Min SHENG, Tsoja WANGMO, Mengmeng WANG, Yi ZHOU, Dopwang PU, Tunzhup LAGBA, Gelsor NORSANG   +6 more
doaj   +1 more source

The Impacts of Zonal and Meridional Winds on the Observed Occurrence Rate of Equatorial Plasma Bubbles

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Post‐sunset equatorial plasma bubble (EPB) formation is believe to be influenced by factors including thermospheric neutral winds. This study characterizes pre‐sunset neutral winds observed by ICON on EPB occurrences observed by GOLD over the east Atlantic.
V. J. Adkins, S. L. England, A. W. Stephan   +2 more
wiley   +1 more source

Observation of equatorial plasma bubbles by the airglow imager on ISS-IMAP

Progress in Earth and Planetary Science, 2018
Using 630 nm airglow data observed by an airglow imager on the International Space Station (ISS), the occurrence of equatorial plasma bubbles (EPBs) is studied.
Hiroyuki Nakata, Akira Takahashi, Toshiaki Takano, Akinori Saito, Takeshi Sakanoi   +4 more
doaj   +1 more source

Post‐Sunset Merging of Equatorial Ionization Anomaly Crests Into a Single Peak Over ∼35° Longitude During the 19 January 2026 Geomagnetic Superstorm

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract We investigate the nighttime equatorial ionosphere during the 19 January 2026 geomagnetic storm using Global‐scale Observations of the Limb and Disk OI 135.6 nm observations and ground‐based GPS Total Electron Content. The observations reveal a pronounced longitudinal asymmetry in the post‐sunset equatorial ionization anomaly (EIA).
Deepak K. Karan, Richard W. Eastes, Kuldeep Pandey, Wenbin Wang, Carlos R. Martinis, Robert E. Daniell, Quan Gan   +6 more
wiley   +1 more source

A GEO‐LEO Imager Data Set for Characterizing Rapid Changes of Global Aerosol Properties

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 15, 16 August 2026.
Abstract Aerosols, the ubiquitous small particulates in our atmosphere, have climate, air quality, and/or other impacts far from their original sources. The Dark Target Algorithm (DTA), originally developed for retrieving aerosol properties from satellite imagers in Low‐Earth Orbit (LEO), has been ported to imagers in Geostationary (GEO) orbit. Using a
R. C. Levy, P. Gupta, Y. R. Shi, L. A. Remer, M. Kim, M. M. Oo, J. Wei, V. R. Sawyer, V. P. Kiliyanpilakkil, R. E. Holz, B. Ramachandran, R. B. Pierce, S. Mattoo   +12 more
wiley   +1 more source

New discoveries on astronomical orientation of Inca site in Ollantaytambo, Peru

Geoinformatics FCE CTU, 2015
This paper deals with astronomical orientation of Incas objects in Ollantaytambo, which is located about 35 km southeast from Machu Picchu, about 40 km northwest from Cusco, and lies in the Urubamba valley.
Karolína Hanzalová, Jaroslav Klokočník, Jan Kostelecký   +2 more
doaj   +1 more source

Structure, Propagation and Variability of the 5‐Day Rossby‐Haurwitz Wave

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 15, 16 August 2026.
Abstract The 5‐day wave is the gravest free Rossby mode predicted by the Laplace shallow water equations, with a latitudinally symmetric, zonal wavenumber one theoretical structure in geopotential extending from pole to pole. It propagates westward along the equator at about 98 m s−1 ${\mathrm{s}}^{-1}$ and was first observed in surface pressure data ...
G. N. Kiladis, R. A. Madden
wiley   +1 more source

Comparison of Magnesium II core-to-wing ratio observations during solar minimum 23/24

Journal of Space Weather and Space Climate, 2014
The MgII index is an important proxy for solar activity; in particular it correlates well with the EUV which is important for understanding the upper atmosphere. We compare the measurements from all of the instruments making daily measurements during the
Snow Martin, Weber Mark, Machol Janet, Viereck Rodney, Richard Erik   +4 more
doaj   +1 more source

Study of paraboloidal optical concentrator by ray-tracing method: Results

Moldavian Journal of the Physical Sciences, 2008
This paper presents results obtained by using a software tool (Ray-Tracer), which we developed in order to simulate small size paraboloidal concentrator. The simulations were carried out for the days corresponding to equinox and solstice moments.
Zaharie, I., Luminosu, I, Ignea, D.
doaj  

The dependence of the [FUV-MUV] colour on solar cycle

Journal of Space Weather and Space Climate, 2017
Solar UV variability is extremely relevant for the stratospheric ozone. It has an impact on Earth’s atmospheric structure and dynamics through radiative heating and ozone photochemistry.
Lovric Mija, Tosone Federico, Pietropaolo Ermanno, Del Moro Dario, Giovannelli Luca, Cagnazzo Chiara, Berrilli Francesco   +6 more
doaj   +1 more source