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ANALYSIS OF SPHERICAL ASTRONOMY ALGORITHMS FOR PREDICTING THE SOLAR ECLIPSE BY W.M. SMART

open access: yesAl-Hilal, 2022
A solar eclipse is an unusual natural occurrence. Muslims used the phenomenon of a solar eclipse as the season for prayer, which was only carried out during a solar eclipse from early in the phenomenon until the end.
Fiki Nuafi Qurrota Aini   +1 more
doaj   +1 more source

Solar System Astronomy Ancillary Resources

open access: yes, 2022
These PowerPoint slides and project resources for use in Solar System Astronomy courses were developed under a Round 18 Transformation ...
Beznosko, Dmitriy   +2 more
core   +1 more source

Spatio-Temporal Analysis of Dust Storm Activity in Chryse Planitia Using MGS-MOC Observations from Mars Years 24–28

open access: yesUniverse, 2021
Dust storms, observed in all seasons, are among the most momentous of Mars’ atmospheric activities. The Entry–Descent–Landing (EDL) activity of a Martian landing mission is influenced by local atmospheric conditions, especially the probability of dust ...
Bo Li   +6 more
doaj   +1 more source

Electron-scale nested quadrupole Hall field in Cluster observations of magnetic reconnection [PDF]

open access: yesAnnales Geophysicae, 2015
This paper presents the first evidence of a new and unique feature of spontaneous reconnection at multiple sites in electron current sheet, viz. a "nested quadrupole" structure of the Hall field at electron scales, in Cluster observations.
N. Jain, A. S. Sharma
doaj   +1 more source

Over seven decades of solar microwave data obtained with Toyokawa and Nobeyama Radio Polarimeters

open access: yesGeoscience Data Journal, 2023
Monitoring observations of solar microwave fluxes and their polarization began in Japan during the 1950s at Toyokawa and Mitaka. At present (April 2022), monitoring observations continues with the Nobeyama Radio Polarimeters (NoRP) at the Nobeyama campus
Masumi Shimojo, Kazumasa Iwai
doaj   +1 more source

Density Fluctuations in the Lower Thermosphere of Mars Retrieved From the ExoMars Trace Gas Orbiter (TGO) Aerobraking

open access: yesAtmosphere, 2019
The upper atmosphere of Mars is constantly perturbed by small-scale gravity waves propagating from below. As gravity waves strongly affect the large-scale dynamics and thermal state, constraining their statistical characteristics is of great importance ...
David Jesch   +4 more
doaj   +1 more source

Deciphering the Slow-rise Precursor of a Major Coronal Mass Ejection

open access: yesThe Astrophysical Journal Letters, 2023
Coronal mass ejections are explosive plasma phenomena prevalently occurring on the Sun and probably on other magnetically active stars. However, how their pre-eruptive configuration evolves toward the main explosion remains elusive.
X. Cheng   +5 more
doaj   +1 more source

The 1948 solar eclipse and the genesis of radio astronomy in Victoria [PDF]

open access: yes, 2004
In the early years of radio astronomy, solar eclipses played a critical role in establishing the sources of solar radio emission. During the half decade from 1945, Australia emerged as a leading nation in radio astronomy, with most of the observations ...
Orchiston, Wayne
core   +1 more source

Thermodynamic and magnetic evolution of an eruptive C-class solar flare observed with SST/TRIPPEL-SP

open access: yesAstronomy & Astrophysics
Solar flares are complex phenomena driven by the release of magnetic energy, but a large energy reservoir is not sufficient to determine their eruptive potential; the magnetic topology and plasma dynamics play a key role.
Díaz Baso C. J.   +6 more
doaj   +1 more source

Cyclic sunspot activity during the first millennium CE as reconstructed from radiocarbon

open access: yesAstronomy & Astrophysics
Context. Solar activity, dominated by 11-year cyclic evolution, has been observed directly since 1610 CE. Indirect cosmogenic proxy data have been used to reconstruct solar activity for millennia prior to 1610.
Usoskin I.   +3 more
doaj   +1 more source

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