Results 71 to 80 of about 1,105,860 (262)

Solar Wind Heavy Ions and Alpha Particles Within Earth's Magnetosphere and Their Variability With Upstream Conditions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 8, August 2025.
Abstract Working toward the goal of understanding solar wind (SW) entry to the Earth's magnetosphere, this study examines solar‐origin ion composition in the magnetotail. During its trajectory, Wind spent a significant amount of time in the Earth's magnetotail, where its SupraThermal Ion Composition Spectrometer (STICS) measured the mass and mass per ...
S. Colón‐Rodríguez, M. W. Liemohn, J. M. Raines, S. T. Lepri   +3 more
wiley   +1 more source

Slender Ca ii H Fibrils Mapping Magnetic Fields in the Low Solar Chromosphere [PDF]

, 2016
A dense forest of slender bright fibrils near a small solar active region is seen in high-quality narrowband Ca ii H images from the SuFI instrument onboard the Sunrise balloon-borne solar observatory.
S. Jafarzadeh, R. Rutten, S. Solanki, S. Solanki, T. Wiegelmann, T. Riethmüller, M. Noort, M. Szydlarski, J. B. Rodríguez, P. Barthol, J. C. D. T. Iniesta, A. Gandorfer, L. Gizon, L. Gizon, J. Hirzberger, M. Knölker, V. Pillet, D. Súarez, W. Schmidt   +18 more
semanticscholar   +1 more source

SIMULATIONS OF ALFVÉN AND KINK WAVE DRIVING OF THE SOLAR CHROMOSPHERE: EFFICIENT HEATING AND SPICULE LAUNCHING [PDF]

, 2016
Two of the central problems in our understanding of the solar chromosphere are how the upper chromosphere is heated and what drives spicules. Estimates of the required chromospheric heating, based on radiative and conductive losses, suggest a rate of ∼0 ...
C. Brady, T. Arber
semanticscholar   +1 more source

Slow Solar Wind: Origin in an Independent Small‐Scale Solar Dynamo

Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.
Abstract Separation of the solar wind (SW) into three flow types (coronal mass ejections (CMEs), high speed streams (HSSs), and slow solar wind (SSW)) reveals an inverse relationship between the percentage of time Earth spends in SSW during a year and its annually averaged magnetic field strength (B).
E. W. Cliver, I. G. Richardson, S. F. Martin   +2 more
wiley   +1 more source

Effect of Magnetic Diffusion in the Chromosphere on the Solar Wind

The Astrophysical Journal
We investigate nonideal magnetohydrodynamical (MHD) effects in the chromosphere on the solar wind by performing MHD simulations for Alfvén-wave-driven winds, explicitly including ohmic and ambipolar diffusion.
Masato Matsuoka, Takeru K. Suzuki, Takato Tokuno, Kensuke Kakiuchi   +3 more
doaj   +1 more source

Observing the Solar Chromosphere

, 2007
This review is split into two parts: one on chromospheric line formation in answer to the frequent question "where is my line formed", and one presenting state-of-the-art imagery of the chromosphere. In the first part I specifically treat the formation of the Na D lines, Ca II H & K, and Halpha.
openaire   +4 more sources

Magnetic Fields and the Supply of Low-frequency Acoustic Wave Energy to the Solar Chromosphere

Astrophysical Journal, 2019
The problem of solar chromospheric heating remains a challenging one with wider implications for stellar physics. Several studies in the recent past have shown that small-scale inclined magnetic field elements channel copious energetic low-frequency ...
S. P. Rajaguru, C. Sangeetha, D. Tripathi   +2 more
semanticscholar   +1 more source

NOAA's National Centers for Environmental Information Space Weather Data Inventory Status

Space Weather, Volume 23, Issue 7, July 2025.
Abstract We present here an updated overview of the Space Weather data curated and/or generated, improved, archived, and disseminated by the Solar Terrestrial Physics (STP) Section of the National Centers for Environmental Information (NCEI) in the National Oceanic and Atmospheric Administration (NOAA).
Alessandra Abe Pacini, Laurel Rachmeler, Kimberly Baugh   +2 more
wiley   +1 more source

Calcium Bright Knots and the Formation of Chromospheric Anemone Jets on the Sun

The Astrophysical Journal Letters
Space-based observations show that the solar atmosphere from the solar chromosphere to the solar corona is filled with small-scale jets and is linked with small-scale explosions.
Kunwar Alkendra Pratap Singh, Keisuke Nishida, Kazunari Shibata   +2 more
doaj   +1 more source

Solar mean magnetic field of the chromosphere

Journal of Astrophysics and Astronomy, 2023
The Solar Mean Magnetic Field (SMMF) is the mean value of the line of sight (LOS) component of the solar vector magnetic field averaged over the visible hemisphere of the Sun. So far, the studies on SMMF have mostly been confined to the magnetic field measurements at the photosphere. In this study, we calculate and analyse the SMMF using magnetic field
M. Vishnu, K. Nagaraju, Harsh Mathur
openaire   +2 more sources