Results 81 to 90 of about 15,850 (231)

A Novel Clustering-Based Methodology for Mapping Lunar Surface Minerals Using Moon Mineralogy Mapper (M³) Hyperspectral Data

Remote Sensing
In this study, we introduce a novel clustering-based methodology for mapping lunar surface mineralogy using hyperspectral data from the Moon Mineralogy Mapper (M3).
George Messinios, Konstantinos Koutroumbas, Olga Sykioti   +2 more
doaj   +1 more source

A Two-Step K-Ar Experiment on Mars: Dating the Diagenetic Formation of Jarosite from Amazonian Groundwaters [PDF]

, 2017
Following K-Ar dating of a mudstone and a sandstone, a third sample has been dated by the Curiosity rover exploring Gale Crater. The Mojave 2 mudstone, which contains relatively abundant jarosite, yielded a young K-Ar bulk age of 2.57 ± 0.39 Ga (1σ ...
Amirkhanoff, Anderson, Bibring, Bischoff, Bish, Blake, Bogard, Bridges, Bristow, Brophy, Cannon, Cassata, Cassata, Changela, Deer, Dehouck, Dekov, Dutrizac, Dutrizac, Ehlmann, Ehlmann, Evernden, Farley, Fassett, Freissinet, Glavin, Gombosi, Grant, Grotzinger, Grotzinger, Halliday, Hamilton, Hartmann, Hartmann, Hartmann, Hassanipak, Hicks, Humayun, Kula, Lee, Leitner, Lofgren, Madden, Mahaffy, Martín-Torres, McEwen, McEwen, McEwen, McSween, Mees, Ming, Minitti, Morris, Morrison, Nachon, Nachon, Nimmo, Nyquist, Ojha, Ojha, Papike, Rampe, Renne, Renne, Robbins, Schwenzer, Siebach, Singer, Smits, Stack, Sutter, Swindle, Thomson, Treiman, Treiman, Treiman, Vaniman, Vasconcelos, Vasconcelos, Wolff-Boenisch   +79 more
core   +2 more sources

Do Eclipse‐Induced Thermospheric TADs Originate From Above or Below?

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract Solar eclipses generate significant wave activity in the Earth's upper atmosphere. The source region of eclipse‐induced Traveling Atmospheric Disturbances (TADs) in the upper thermosphere—particularly the relative contributions of gravity waves from the thermosphere itself versus the lower atmosphere—remains unknown. Using the Whole Atmosphere
Yu Jiao, Jing Liu, Shuhan Li, Joseph M. McInerney, Jianyong Li, Yuyan Yang   +5 more
wiley   +1 more source

Impact-induced mixing generated the stratified soils of the Lunar South Pole Aitken Basin

Communications Earth & Environment
The Mg-pyroxene annulus in the South Pole–Aitken (SPA) basin holds crucial information about the lunar crustal evolution, yet its mineralogy and origin remain debate. Here we analyzed the mineralogy, exogenic ejecta, and soil evolution of the 2.8-billion-
Haijun Cao, Jian Chen, Xuejin Lu, Jiaqi Kong, Le Qiao, Chengxiang Yin, Changqing Liu, Hongkun Qu, Xiaohui Fu, Yanqing Xin, Zongcheng Ling   +10 more
doaj   +1 more source

Analysis of regolith electromagnetic scattering as constrained by high resolution Earth-based measurements of the lunar microwave emission [PDF]

When high resolution measurements of the phase variation of the lunar disk center brightness temperature revealed that in situ regolith electrical losses were larger than those measured on returned samples by a factor of 1.5 to 2.0 at centimeter ...
Keihm, S. J.
core   +1 more source

Amazonian Hydrothermal Alteration Comparing Nakhlite Secondary Mineralogy to Water Rock Reaction Experiments [PDF]

, 2018
We report on results from experiments with Mars analog materials under diagenetic conditions. The mineralogical results of our experiments suggest that an important type of fluid alteration in the Amazonian may be short duration (e.g.
Bridges, J. C., Bullock, M. A., Chavez, C., Craig, P., Filiberto, J., Hicks, L. J., Kelley, S. P., McIntosh, R. A., Miller, M. A., Moore, J. M., Ott, U., Schwenzer, S. P., Smith, H., Swindle, T. D., Treiman, A. H.   +14 more
core  

Evidence for silicate dissolution on Mars from the Nakhla meteorite [PDF]

, 2013
Veins containing carbonates, hydrous silicates and sulphates that occur within and between grains of augite and olivine in the Nakhla meteorite are good evidence for the former presence of liquid water in the Martian crust.
Ashworth, Ashworth, Awad, Banfield, Borg, Boudier, Brantley, Bridges, Bridges, Bridges, Cassata, Changela, Chizmadia, Eugster, Friedman-Lentz, Fritz, Gooding, Hallis, Harvey, Kirby, Korochantseva, Langenhorst, Langenhorst, Lee, Lee, Lentz, Mikouchi, Noguchi, Plümper, Rao, Sawyer, Stopar, Treiman, Treiman, Treiman, Velbel, Velbel, Velbel, Wegner, Welch   +39 more
core   +1 more source

Meridional Currents of the Equatorial Electrojet

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract The equatorial electrojet (EEJ) is a prominent eastward geomagnetic current flowing at the dayside magnetic dip equator, peaking just before noon. Associated meridional currents also flow perpendicular to the main current, predicted through modeling and observed in rocket measurements.
X. G. V. M. Topacio, A. Yoshikawa
wiley   +1 more source

Remote Compositional Analyses of Space-weathered Lunar Maria

The Planetary Science Journal
Visible-to-shortwave infrared (VSWIR) reflectance spectroscopy has revolutionized our understanding of planetary surface compositions. However, space-weathering processes on airless bodies complicate quantitative compositional analyses.
Ji-In Jung, Mathieu G. A. Lapôtre, Ralph E. Milliken, Sarah E. Minson   +3 more
doaj   +1 more source

Quasi‐Trapped Zebra Stripes: Radial Transport Driven by Dual‐Pulse Electric Fields

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract Energetic electron spectra in Earth's inner radiation belt often exhibit regular stripe‐like features, known as “zebra stripes,” which are typically attributed to the drift motion of stably‐trapped electrons disturbed by electric field perturbations.
Ziyang Wang, Ying Liu, Qiugang Zong, Yixin Sun, Hong Zou, Yuguang Ye   +5 more
wiley   +1 more source