Results 111 to 120 of about 54,423 (197)

H-alpha synoptic charts of solar activity during the first year of solar cycle 20, October 1964 - August 1965 [PDF]

Solar activity during the period October 28, 1964 through August 27, 1965 is presented in the form of charts for each solar rotation constructed from observations made with the chromospheric H-alpha spectra line.
Mcintosh, P. S.
core   +1 more source

Short‐Term Effect of Mars‐Like Radiation on Carbon and Oxygen Isotope Compositions of Carbonates

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract The stable isotope composition of carbonates records the environmental formation conditions and can indicate potential biosignatures if formed biologically. Martian meteorite carbonates display unusually high δ13C values, not explained using known terrestrial processes.
Nicolas Randazzo, Sang‐Tae Kim, Fabien Stalport, Maikel C. Rheinstäder, Hervé Cottin, Patrice Coll   +5 more
wiley   +1 more source

Craters and Lunar Lua (Pits/Skylights) in Mare Tranquillitatis and Marius Hills Reveal Variations in Protolith Properties

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract We investigated the regolith parent rock (“protolith”) properties of Mare Tranquillitatis and Marius Hills on the Moon, utilizing lunar pit craters (“lua”) to contextualize observations of rock abundance and crater degradation. We discovered a significant difference in underlying materials: the region around the Tranquillitatis lua is ...
E. S. Costello, C. L. Acohido, M. A. Chertok, C. M. Ferrari‐Wong, C. L. Slagle, A. Ito   +5 more
wiley   +1 more source

Re-evaluation of cosmic ray cutoff terminology [PDF]

The study of cosmic ray access to locations inside the geomagnetic field has evolved in a manner that has led to some misunderstanding and misapplication of the terminology originally developed to describe particle access.
Byrnak, B., Cooke, D. J., Goret, P., Humble, J. E., Lund, N., Petrou, N., Rasmussen, I. L., Shea, M. A., Smart, D. F.   +8 more
core   +1 more source

TranQuiL: Long Range Detection and Localization of Interference in Radio Quiet Zones

Radio Science, Volume 61, Issue 1, January 2026.
Abstract Radio Quiet Zones (RQZs) have been established to prevent radio sources from causing harmful interference to sensitive radio telescopes, which study extremely faint cosmic radio waves. Even with strict regulations, such interference is growing due to the widespread use of consumer electronics, emitting in many different frequency bands ...
Atul Bansal, Mohamed Ibrahim, Kuang Yuan, Yiwen Song, Bob Iannucci, Swarun Kumar   +5 more
wiley   +1 more source

Solar variability, weather, and climate [PDF]

Advances in the understanding of possible effects of solar variations on weather and climate are most likely to emerge by addressing the subject in terms of fundamental physical principles of atmospheric sciences and solar-terrestrial physis.

core   +1 more source

Topside Ionization and Effect on Altitudinal Evolution of Nocturnal Ionospheric Irregularities

Space Weather, Volume 24, Issue 1, January 2026.
Abstract Topside ionospheric electron density (Ne) and its control on the variabilities in nocturnal ionospheric irregularities is examined globally using electron density measurements from COSMIC‐2 and Swarm satellite, along with the Swarm satellite‐based Ionospheric Plasma Irregularity (IPIR) index for low and high solar activity (LSA and HSA ...
T. V. Sruthi, G. Manju
wiley   +1 more source

The Chinese Radio Telescope Array for Interplanetary Scintillation Monitoring

Space Weather, Volume 24, Issue 1, January 2026.
Abstract Solar flares, coronal mass ejections (CMEs) and enegertic particles, etc., are the driving sources that may cause catastrophic space weathers. It is desirable to obtain information of solar eruptions like flares and CMEs, etc., propagating from the Sun to the near‐Earth space.
Yihua Yan, Wei Wang, Jin Fan, Ming Xiong, Zhijun Chen, Linjie Chen, Cang Su, Sha Li, Jun Cheng, Jing Du, Xueshang Feng   +10 more
wiley   +1 more source

Global Ionospheric Slab Thickness Prediction Model Using XGBoost and Ensemble Learning

Space Weather, Volume 24, Issue 1, January 2026.
Abstract The ionospheric equivalent slab thickness is a key parameter for understanding the plasma distribution in the ionosphere, with direct relevance to satellite navigation, communication, and skywave over‐the‐horizon radar. However, traditional prediction methods often suffer from regional biases, limiting their global applicability.
C. Han, X. R. Chong, M. Ou, D. D. Wang, J. Feng, G. Chen, X. L. Min, D. W. Wang, Z. X. Gao   +8 more
wiley   +1 more source

The role of vibrationally excited oxygen and nitrogen in the D and E regions of the ionosphere

Annales Geophysicae
In this paper we present the results of a study of the effect of vibrationally excited oxygen, O^*₂, and nitrogen, N^*₂, on the electron density, <i>N</i ...
A. V. Pavlov
doaj