Results 111 to 120 of about 2,624,667 (213)

Different Faces of the Martian Magnetosphere

Journal of Geophysical Research: Space Physics, Volume 130, Issue 4, April 2025.
Abstract The Martian magnetosphere contains components of the induced and intrinsic magnetospheres. Since we can not get a global snapshot of the magnetosphere we use a statistical picture based on a large number of measurements. Depending on the choice of coordinate system and the data selection we can observe different faces of the Martian ...
E. Dubinin, M. Fraenz, R. Modolo, M. Pätzold, S. Tellmann, G. DiBraccio   +5 more
wiley   +1 more source

Evolution of the stellar metallicities of galaxies in the EAGLE simulations [PDF]

arXiv, 2018
We study the correlation between stellar mass and stellar metallicity in the Evolution and Assembly of GaLaxies and their Environments (EAGLE) suite of cosmological hydrodynamical simulations. At a given stellar mass, simulated galaxies with lower stellar metallicities show, on average, higher gas fractions, higher specific star formation rates and ...
arxiv  

Nowcasting Solar Energetic Particle Events for Mars Missions

Space Weather, Volume 23, Issue 4, April 2025.
Abstract In addition to the omnipresent Galactic Cosmic Rays, sudden Solar Energetic Particle (SEP) events present considerable health hazards for manned space missions. These events not only contribute to an increased long‐term cancer risk, but can, in extreme cases, cause acute radiation syndromes.
Jan Leo Löwe, Salman Khaksarighiri, Robert F. Wimmer‐Schweingruber, Donald M. Hassler, Bent Ehresmann, Jingnan Guo, Günther Reitz, Thomas Berger, Daniel Matthiä, Cary Zeitlin, Sven Löffler   +10 more
wiley   +1 more source

The rotation and Galactic kinematics of mid M dwarfs in the Solar Neighborhood

, 2015
Rotation is a directly-observable stellar property, and drives magnetic field generation and activity through a magnetic dynamo. Main sequence stars with masses below approximately 0.35Msun (mid-to-late M dwarfs) are fully-convective, and are expected to
Berta-Thompson, Zachory K., Charbonneau, David, Dittmann, Jason A., Irwin, Jonathan, Newton, Elisabeth R., West, Andrew A.   +5 more
core   +1 more source

Energetic Compact Strokes as the Major Source of Downward Terrestrial Gamma‐Ray Flashes in Winter Thunderstorms

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract Terrestrial gamma‐ray flashes (TGFs) are short bursts of intense gamma radiation associated with lightning discharges. Although thousands of TGFs have been observed from space, TGFs detected at ground level, known as downward TGFs, are still very limited, and their relationship with lightning discharge processes remains elusive. Here we report
Ting Wu, David M. Smith, Yuuki Wada, Kazuhiro Nakazawa, Manari Oguchi, Masashi Kamogawa, Tomoyuki Suzuki, Qingliu Yang, Daohong Wang   +8 more
wiley   +1 more source

Cosmic Rays and the Askaryan Effect Reveal Subsurface Structure and Buried Ice on the Moon

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract We present the first full‐wavelength numerical simulations of the electric field generated by cosmic ray impacts into the Moon. Billions of cosmic rays fall onto the Moon every year. Ultra‐high energy cosmic ray impacts produce secondary particle cascades within the regolith and subsequent coherent, wide‐bandwidth, linearly‐polarized radio ...
E. S. Costello, R. R. Ghent, A. Romero‐Wolf, P. W. Gorham, P. G. Lucey, C. J. Tai Udovicic, P. Linton, A. Ludwig, K. McBride, C. Miki, E. Oberla, J. Rolla, A. Jung   +12 more
wiley   +1 more source

Early Evolution of Stellar Clusters [PDF]

arXiv, 1999
Observations have revealed that most stars are born in clusters. These systems, containing from tens to thousands of stars and typically significant mass in gas in the youngest systems, evolve due to a combination of stellar and star-gas interactions. Simulations of pure stellar systems are used to investigate possible initial configurations including ...
arxiv  

Generation of Quasi‐Periodic Dayside Medium Scale Traveling Ionospheric Disturbances (MSTIDs) by Intermittent Lobe Reconnection

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract The medium‐scale traveling ionospheric disturbances (MSTIDs) can be excited by many sources. Among those magnetic reconnection has been proposed as a potential driver for dayside MSTIDs, but direct evidence has been limited. Using ground‐based radar data from the Super Dual Auroral Radar Network on 14 December 2012, we observed quasi‐periodic ...
Yating Xiong, Huixin Liu, Run Shi, Zanyang Xing, Sheng Lu, Qiang Zhang, Zhiwei Wang, Desheng Han   +7 more
wiley   +1 more source

New Insights on the High Reconnection Rate and the Diminishment of Ion Outflow

Geophysical Research Letters, Volume 52, Issue 6, 28 March 2025.
Abstract The recently discovered electron‐only reconnection has abnormal features like lack of ion outflows and high reconnection rates. Using particle‐in‐cell simulations, we investigate their physical mechanisms. The reconnection rate, when normalized by ion parameters (Ri ${R}_{i}$), may appear anomalously high, whereas that normalized by electron ...
Cheng‐Yu Fan, Shan Wang, Xu‐Zhi Zhou, San Lu, Quanming Lu, Prayash Sharma Pyakurel, Qiugang Zong, Zhi‐Yang Liu   +7 more
wiley   +1 more source

ProGeny I: a new simple stellar population generator and impact of isochrones / stellar atmospheres / initial mass functions [PDF]

arXiv
In this work we introduce ProGeny, a new stellar population library (SPL) software package written in R. This release encapsulates the core software to generate simple/single stellar populations (SSPs); the various data inputs required (in particular isochrones and stellar atmospheres); example scripts to generate the SSPs; and a number of pre ...
arxiv