Results 91 to 100 of about 14,496 (257)
High frequency and high wavenumber solar oscillations
, 1999 We determine the frequencies of solar oscillations covering a wide range of degree (100< l
Ando H. +7 more
core +1 more source
Height dependence of the penumbral fine-scale structure in the inner solar atmosphere [PDF]
, 2018 We studied the physical parameters of the penumbra in a large and fully-developed sunspot, one of the largest over the last two solar cycles, by using full-Stokes measurements taken at the photospheric Fe I 617.3 nm and chromospheric Ca II 854.2 nm lines
Ermolli, I. +8 more
core +2 more sources
Astronomy & AstrophysicsContext. These studies were carried out in the context of solar-chromosphere heating and solar-wind generation. Aims. We aim to explore granulation-generated, two-fluid waves and flows in the solar atmosphere permeated by a solar magnetic carpet. Methods.
Niedziela R. +2 more
doaj +1 more source
The solar flare environment [PDF]
Solar flare environment - solar atmosphere, photosphere, chromosphere, corona, and solar flare types, model, occurence, prediction, and ...
Roberts, W. T.
core +1 more source
On the Weakening of Chromospheric Magnetic Field in Active Regions
, 2008 Simultaneous measurement of line-of-sight (LOS) magnetic and velocity fields at the photosphere and chromosphere are presented. Fe I line at $\lambda6569$ and $H_{\alpha}$ at $\lambda6563$ are used respectively for deriving the physical parameters at ...
Casini R. +6 more
core +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 +2 more
wiley +1 more source
On the solar chromosphere observed at the limb with Hinode
, 2010 Broad-band images in the Ca II H line, from the BFI instrument on the Hinode spacecraft, show emission from spicules emerging from and visible right down to the observed limb.
Carlsson, Mats, Judge, Philip G.
core +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 +2 more
wiley +1 more source
, 2017 We investigate the magnetic field of a sunspot in the upper chromosphere and compare it to the field's photospheric properties. We observed the main leading sunspot of the active region NOAA 11124 on two days with the Tenrife Infrared Polarimeter-2 (TIP ...
Hirzberger, Johann +3 more
core +1 more source
Robust Statistical Techniques for Operational Maintenance of the 10.7 cm Solar Radio Flux
Space Weather, Volume 23, Issue 5, May 2025.Abstract The F10.7 solar radio flux is a critical quantity for operational space weather nowcasting and forecasting, where it is routinely used as a driver for coupled atmospheric models to estimate a variety of important quantities such as the neutral atmospheric density.
Daniel A. Brandt +2 more
wiley +1 more source