Results 71 to 80 of about 1,100 (241)

Are We Witnessing a Speciation Continuum? Evidence From Current and Past Gene Flow in the Genus Oritrophium s.s. (Asteraceae) From the Tropical High Andes

Molecular Ecology, EarlyView.
ABSTRACT Determining species boundaries is key for appropriately assessing biodiversity. However, the continuity of the speciation process makes delimiting species a difficult task, especially for recently diverged taxa. Furthermore, past introgression may leave traces that result in reticulate evolutionary patterns, challenging the estimation of ...
Juan Manuel Gorospe, Luciana Salomón, Jorge Armijos‐Barros, Adam Kantor, Filip Kolář, Itziar Arnelas, Petr Sklenář, Roswitha Schmickl   +7 more
wiley   +1 more source

Ecological Risk Assessment and Management of Forest Fires in Tamil Nadu, India: A MaxEnt Model‐Based Approach for Strategic Resource Allocation and Fire Mitigation

Risk Analysis, EarlyView.
ABSTRACT Forest fires are integral to forest ecosystems as they influence nutrient cycling, plant regeneration, tree density, and biodiversity. However, human‐induced climate change and activities have made forest fires more frequent, more intense, and more widespread, exacerbating their ecological and socioeconomic impact.
Gowhar Meraj, Shizuka Hashimoto, Rajarshi Dasgupta, Bijon Kumer Mitra   +3 more
wiley   +1 more source

An empirical model of the global distribution of plasmaspheric hiss based on Van Allen Probes EMFISIS measurements

Earth and Planetary Physics, 2020
Using wave measurements from the EMFISIS instrument onboard Van Allen Probes, we investigate statistically the spatial distributions of the intensity of plasmaspheric hiss waves.
JingZhi Wang, Qi Zhu, XuDong Gu, Song Fu, JianGuang Guo, XiaoXin Zhang, Juan Yi, YingJie Guo, BinBin Ni, Zheng Xiang   +9 more
doaj   +1 more source

Imprints of impulse‐excited hydromagnetic waves on electrons in the Van Allen radiation belts [PDF]

Geophysical Research Letters, 2015
AbstractUltralow frequency electromagnetic oscillations, interpreted as standing hydromagnetic waves in the magnetosphere, are a major energy source that accelerates electrons to relativistic energies in the Van Allen radiation belt. Electrons can rapidly gain energy from the waves when they resonate via a process called drift resonance, which is ...
Seth G. Claudepierre, Margaret G. Kivelson, Yixin Hao, Zuyin Pu, Z. Wang, Xu-Zhi Zhou, Xu-Zhi Zhou, Yongfu Wang, Vassilis Angelopoulos, Qiugang Zong, Ian R. Mann   +10 more
openaire   +2 more sources

Comparative Analysis of Sub GTO, GTO and Super GTO in Orbit Raising for All Electric Satellites

Sakarya University Journal of Computer and Information Sciences, 2018
Electric propulsion system has been used on many geostationary communication satellites for station keeping maneuver because of having high specific impulse values.
İbrahim Öz
doaj  

Turning Noise Into Data: Characterization of the Van Allen Radiation Belt Using SDO Spikes Data [PDF]

, 2023
Spiridon Kasapis, B. J. Thompson, J. V. Rodriguez, Raphaël Attié, Gonzalo Cucho‐Padin, D. E. da Silva, Meng Jin, W. D. Pesnell   +7 more
openalex   +1 more source

A Small Pathbreaking Spacecraft: Giants of Space Research (Bernard Blake, Dieter Hovestadt, and Edward Stone)

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract The Solar, Anomalous, and Magnetospheric Explorer (SAMPEX) mission launched in July 1992 was the first NASA “Small Explorer” project. It had the goal to show how space missions could be developed much more rapidly than had become the situation in the 1980s and 1990s.
D. N. Baker, G. M. Mason
wiley   +1 more source

Characteristics of High‐Energy Protons in the Equatorial Plane of Inner Radiation Belt Observed by Van Allen Probes [PDF]

, 2023
Zhaohai He, Jiyao Xu, Lei Dai, Chi Wang, Tao Chen, Suping Duan, I. Roth   +6 more
openalex   +1 more source

Generation of extremely low frequency chorus in Van Allen radiation belts

Journal of Geophysical Research: Space Physics, 2017
AbstractRecent studies have shown that chorus can efficiently accelerate the outer radiation belt electrons to relativistic energies. Chorus, previously often observed above 0.1 equatorial electron gyrofrequency fce, was generated by energetic electrons originating from Earth's plasma sheet.
Fuliang Xiao, Si Liu, Xin Tao, Zhenpeng Su, Qinghua Zhou, Chang Yang, Zhaoguo He, Yihua He, Zhonglei Gao, D. N. Baker, H. E. Spence, G. D. Reeves, H. O. Funsten, J. B. Blake   +13 more
openaire   +3 more sources

Assessing Yield Gaps and Risks in Cropping Systems of Southern Brazil

Journal of Agronomy and Crop Science, Volume 211, Issue 6, November 2025.
ABSTRACT While studies often focus on increasing yields of individual crops, optimising cropping systems through adjustments in crop type, frequency and timing can also enhance annual production. Extending the soybean sowing period, motivated by the search for higher yield potential and greater cropping system efficiency, complicates the ability of ...
Eduardo Lago Tagliapietra, Nereu Augusto Streck, Enrico Fleck Tura, Alexandre Ferigolo Alves, Michel Rocha da Silva, Mauricio Fornalski Soares, José Eduardo Minussi Winck, Felipe Schmidt Dalla Porta, María Sol Zelaya Arce, Gilnei Forgiarini Uliana, Jeniffer Seitenfus Zanuz, Alencar Junior Zanon, Giovana Ghisleni Ribas   +12 more
wiley   +1 more source