Results 71 to 80 of about 33,721 (170)

Expanding the Tephrochronological Record in the Alps: Discovery of the Laacher See Tephra in Lake Plansee (Austria)

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract We present the first documented occurrence of the Laacher See tephra (LST) in the Eastern Alps, identified in lake Plansee, Austria. The LST is a key chronostratigraphic marker for correlating and dating Late Glacial sedimentary archives. This discovery was made by progressively narrowing down observational limits from rough estimates of ...
V. Meier, D. Vondrák, M. Racek, M. Ortler, A. Ramisch, J. Moernaut, S. Wagner, P. Tropper, M. Strasser   +8 more
wiley   +1 more source

Elemental Mapping Reveals Selective Dolomitization in Tonian Stromatolites: Implications for Early Diagenesis and Paleoenvironmental Proxies

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract Stromatolites archive critical information on Precambrian marine environments, but their geochemical signals are often obscured using complex diagenetic processes. Tonian stromatolites from the Weiji Formation, North China, show selective dolomitization in dark stromatolitic laminae, forming zoned dolomites.
Ziheng Liang, Meng Ning, Chenqing Li, Xia Wang, Chaochao Xing   +4 more
wiley   +1 more source

Particle astrophysics [PDF]

The following scientific areas are reviewed: (1) cosmology and particle physics (particle physics and the early universe, dark matter, and other relics); (2) stellar physics and particles (solar neutrinos, supernovae, and unconventional particle physics);
Aprile, Elena, Barish, Barry C., Beier, Eugene W., Brandenberger, Robert, Cabrera, Blas, Caldwell, David, Cassiday, George, Cline, David B., Cronin, James, Sadoulet, Bernard   +9 more
core   +1 more source

An Open‐Source Python Version of Power Spectral Density Periodicity Detection and Background Estimation Using the Adaptive Multitaper Method

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract The adaptive Multitaper Method (aMTM) is a Fourier analysis‐based technique that produces a power spectral density (PSD) with a user‐defined frequency resolution, reduces variance associated with standard digital Fourier Transform (FT) algorithms, and minimizes spectral power leakage.
Hector A. Salinas, Simone Di Matteo, Nicholeen M. Viall, Larry Kepko, Victoria D. Wilder   +4 more
wiley   +1 more source

Viscosity‐Driven Dynamics of the Midnight Temperature Maximum in the Low‐Latitude Thermosphere

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract This paper investigates the impact of viscosity on the dynamics of the Midnight Temperature Maximum (MTM) in the low‐latitude thermosphere. Our study utilizes simulations to examine how varying levels of viscosity influence neutral temperature patterns and horizontal wind behaviors, which, in turn, drive the MTM characterized by peak neutral ...
Onyinye G. Nwankwo, Aaron J. Ridley
wiley   +1 more source

Climatology of Pi2 Pulsations Deduced From the Wp Index

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract We examine the statistical properties of the Pi2 occurrence rate, especially the seasonal and universal‐time (UT) variations by analyzing the Wp index. The Wp index represents the wave power of Pi2 pulsations, and Pi2 events can be identified from the Wp index. We then examine the seasonal and UT variations of the Pi2 occurrence frequency. The
Shin'ya Nakano, Ryuho Kataoka, Masahito Nosé   +2 more
wiley   +1 more source

Dynamic Test Particle Simulations of X‐Ray Emissions at Dayside Magnetopause Under Time‐Varying Solar Wind Conditions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract The Latmos Test Particle (LaTeP) model is a steady‐state test particle code to investigate the solar wind charge exchange soft X‐ray emissions of the steady‐state Earth magnetosphere. In this study, we present the development of a new dynamic version (D‐LaTeP) extending the LaTeP model to adapt to time‐varying solar wind conditions.
Qiuyu Xu, Dimitra Koutroumpa, Ronan Modolo, Binbin Tang   +3 more
wiley   +1 more source

Stormtime Magnetospheric Processes Associated With the Dawnside Current Wedge

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract The intensification of the westward auroral electrojet (AEJ) in the dawn sector is a characteristic feature of the storm main phase. It is considered an ionospheric segment of a wedge‐type current system, the dawnside current wedge (DCW), formed by the disruption (short‐circuiting through the ionosphere) of a magnetospheric equatorial current.
S. Ohtani, S. Raptis, A. P. Devanandan, T. Motoba, Y. Zou, J. W. Gjerloev, V. G. Merkin   +6 more
wiley   +1 more source

Are Cusp‐Aligned Arcs the Equivalent of Auroral Streamers in a Closed Magnetosphere?

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract We present the first observations of a 3‐hour quasi‐periodic intensification of the polar auroras during a prolonged interval of strongly‐northward interplanetary magnetic field (IMF). This takes the form of a localized spot of auroral emission that appears near the pole which subsequently spreads sunward and antisunward to produce a sun ...
S. E. Milan, M. K. Mooney, G. E. Bower, G. Kennedy, X.‐Y. Wang, B. Hubert, M. R. Hairston, L. J. Paxton   +7 more
wiley   +1 more source

Spontaneous Hot Flow Anomalies in Earth's Foreshock

Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.
Abstract In recent years, we have learned that foreshock transients play an influential role in solar wind coupling with Earth's magnetosphere. These transients include spontaneous hot flow anomalies (SHFAs), which are characterized by dips in magnetic field magnitude and ion density, enhanced temperature, decelerated and deflected solar wind flow, and
D. Rojas‐Castillo, X. Blanco‐Cano, P. Kajdič   +2 more
wiley   +1 more source