Results 41 to 50 of about 728 (195)

Approximation of Daily AMS‐02 Spectra With Machine Learning Methods

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 4, December 2025.
Abstract Almost three thousand daily AMS‐02 proton spectra from 2011 to 2019 offer the most precise and extensive data set of cosmic ray spectra covering a wide energy range. As such, they offer a unique opportunity to test machine learning algorithms for approximating cosmic ray proton spectra based on the inputs usually available to solar modulation ...
Martin Nguyen, Pavol Bobík, Ján Genči
wiley   +1 more source

Spectral Properties of Globally Distributed ENA Fluxes across Diverse Regions of the Heliosphere

The Astrophysical Journal
This study analyzes energetic neutral atom (ENA) spectral properties across distinct regions of globally distributed flux (GDF) sky maps, using Interstellar Boundary Explorer data from a full solar cycle, corrected for time dispersion.
Thomas K. Kim, Daniel B. Reisenfeld, Eric J. Zirnstein, Paul H. Janzen, Asher S. Merrill, Sung Jun Noh, Nehpreet K. Walia, Yue Chen, Fan Guo, Dave Osthus, Lauren J. Beesley, Dae-Kyu Shin, Justyna M. Sokół, Maciej Bzowski, Marzena A. Kubiak, Czeslaw Porowski, Herbert O. Funsten   +16 more
doaj   +1 more source

A Three-dimensional Model for the Evolution of Magnetohydrodynamic Turbulence in the Outer Heliosphere

The Astrophysical Journal, 2023
We present a time-dependent, three-dimensional single-fluid model for the transport of magnetohydrodynamic (MHD) turbulence that is self-consistently evolving with a dynamic large-scale solar wind in the outer heliosphere.
Jens Kleimann, Sean Oughton, Horst Fichtner, Klaus Scherer   +3 more
doaj   +1 more source

Alfvénic Contribution From the Solar Wind to Magnetospheric Dynamics

Space Weather, Volume 23, Issue 10, October 2025.
Abstract This paper proposes for the first time a theoretical expression for the injection of energy from the solar wind into the ring current due to Alfvénic fluctuations. Using interplanetary and geomagnetic measurements, we select four case studies, validate our approach, and compute the parameters involved in the proposed expression.
E. Saiz, C. Cid
wiley   +1 more source

Breathing of heliospheric structures triggered by the solar-cycle activity [PDF]

Annales Geophysicae, 2003
Solar wind ram pressure variations occuring within the solar activity cycle are communicated to the outer heliosphere as complicated time-variabilities, but repeating its typical form with the activity period of about 11 years.
K. Scherer, H. J. Fahr
doaj   +1 more source

Proton Cyclotron Waves and Pickup Ion Ring Distribution Instabilities Upstream of Mars

Geophysical Research Letters, Volume 51, Issue 21, 16 November 2024.
Abstract Proton cyclotron waves (PCWs) upstream of Mars are thought to be associated with the instabilities of pickup ions. The instabilities of pickup ions of ring distributions have larger maximum growth rates compared with beam distributions.
Kun Cheng, Kaijun Liu, Ameneh Mousavi, Misa Cowee, Xianming Zheng, Jingyi Zhou, Yan Wang, Yuqi Liu, Xinye Wang   +8 more
wiley   +1 more source

Consequences of Hot Electrons for the Structure of the Outer Heliosphere

The Astrophysical Journal
The temperature of electrons is largely unknown in the outer heliosphere because there is a gap in Voyager measurements from ∼3 eV to 22 keV. Most models assume that the electrons have the same temperature as the bulk cold thermal solar wind (10 ^4 K ...
Ethan Schuyler Bair, Merav Opher, Marc Zachary Kornbleuth, Bertalan Zieger, Gabor Toth, Bart van der Holst   +5 more
doaj   +1 more source

The charge-exchange induced coupling between plasma-gas counterflows in the heliosheath [PDF]

Annales Geophysicae, 2003
Many hydrodynamic models have been presented which give similar views of the interaction of the solar wind plasma bubble with the counterstreaming partially ionized interstellar medium.
H. J. Fahr
doaj   +1 more source

On the Anisotropic Velocity Distribution of Newborn Pickup Ions in the Heliosheath

The Astrophysical Journal Letters
The evolution of the velocity distribution of pickup ions is crucial for understanding the energetic neutral atom (ENA) fluxes observed by Interstellar Boundary Explorer.
Senbei Du, Merav Opher, Marc Kornbleuth
doaj   +1 more source

Imaging the heliosheath using HSTOF energetic neutral atoms and Voyager 1 ion data

, 2008
Context. Voyager 1 and 2 LECP instruments measure the distributions of the heliosheath ions of energies ≥40 keV. This threshold energy is an order of magnitude higher than the maximum energy (6 keV) of the energetic neutral atoms (ENA) to be measured
Grzedzielski, S., Kota, J., Hsieh, K., S. Grzedzielski, J. Kóta, Czechowski, A., M. Hilchenbach, Hilchenbach, M., Hsieh, K. C., K. C. Hsieh, A. Czechowski   +10 more
core   +1 more source