Results 101 to 110 of about 2,627,055 (211)
, 2010 We seek the best size estimates of the asteroid (21) Lutetia, the direction of its spin axis, and its bulk density, assuming its shape is well described by a smooth featureless triaxial ellipsoid, and to evaluate the deviations from this assumption ...
A. Conrad +52 more
core +2 more sources
Variations in Hawaiian Plume Flux Controlled by Ancient Mantle Depletion
AGU Advances, Volume 6, Issue 2, April 2025.Abstract Mantle plumes—upwellings of buoyant rock in Earth's mantle—feed hotspot volcanoes such as Hawai‘i. The size of volcanoes along the Hawai‘i–Emperor chain, and thus the magma flux of the Hawaiian plume, has varied over the past 85 million years. Fifteen and two million years ago, rapid bursts in magmatic production led to the emergence of large ...
Paul Béguelin +5 more
wiley +1 more source
On the Transition from AGB Stars to Planetaries: The Spherical Case [PDF]
arXiv, 1999 We discuss the basic physical model and the relevant processes responsible for creating and shaping planetary nebulae out of a cool AGB wind envelope. We show that a hydrodynamical treatment along the upper AGB leads quite naturally to more realistic starting configurations for planetaries with density slopes steeper than r^{-2}.
arxiv
The Need for Better Monitoring of Climate Change in the Middle and Upper Atmosphere
AGU Advances, Volume 6, Issue 2, April 2025.Abstract Anthropogenic greenhouse gas emissions significantly impact the middle and upper atmosphere. They cause cooling and thermal shrinking and affect the atmospheric structure. Atmospheric contraction results in changes in key atmospheric features, such as the stratopause height or the peak ionospheric electron density, and also results in reduced ...
Juan A. Añel +13 more
wiley +1 more source
Habitable Exoplanet Imager: Optical Telescope Structural Design and Performance Prediction [PDF]
Habitable Exoplanet Imaging Mission (HabEx) is a concept for a mission to directly image and characterize planetary systems around Sun-like stars. In addition to the search for life on Earth-like exoplanets, HabExwill enable a broad range of general ...
Stahl, H. Philip
core +1 more source
Properties of Proto--Planetary Nebulae [PDF]
arXiv, 2000 This review describes some general properites of proto-planetary nebulae with particular emphasis on the recent work of morpholgical studies. The weight of observational evidence shows that proto-planetary nebulae (PPNe) are most certainly axisymmetric like planetary nebulae.
arxiv
Megapluvials in Southwestern North America
AGU Advances, Volume 6, Issue 2, April 2025.Abstract Droughts over the last century in Southwestern North America (SWNA) have had severe consequences for people and ecosystems across the region, most recently during the early 21st‐century megadrought (2000–2022). The 20th century, however, was bracketed by two extended pluvials that also had significant impacts in the region.
Benjamin I. Cook +4 more
wiley +1 more source
Six Hot Topics in Planetary Astronomy [PDF]
arXiv, 2008 Six hot topics in modern planetary astronomy are described: 1) lightcurves and densities of small bodies 2) colors of Kuiper belt objects and the distribution of the ultrared matter 3) spectroscopy and the crystallinity of ice in the outer Solar system 4) irregular satellites of the giant planets 5) the Main Belt Comets and 6) comets and meteor stream ...
arxiv
High‐Speed Electron Flows in the Earth Magnetotail
AGU Advances, Volume 6, Issue 2, April 2025.Abstract High‐speed electron flows (HSEFs) play a crucial role in the energy dissipation and conversion processes within the terrestrial magnetosphere and can drive various types of plasma waves and instabilities, affecting the electron‐scale dynamics.
Huijie Liu +20 more
wiley +1 more source
Earth and Space Science, Volume 12, Issue 4, April 2025.Abstract Space‐based in situ magnetic field measurements are often limited by spacecraft‐generated interference, known as stray magnetic fields. These fields, generated by currents from spacecraft subsystems, are frequently several times stronger than the ambient magnetic field signals of interest.
Alex P. Hoffmann, Mark B. Moldwin
wiley +1 more source