Results 51 to 60 of about 16,482 (212)
Measurements of the Perpendicular Correlation Length of Coronal Alfvénic Waves with DKIST
The Astrophysical JournalWe have measured the perpendicular correlation length L _⊥ of Alfvénic waves in the corona using data from the Daniel K. Inouye Solar Telescope (DKIST) Cryogenic Near Infrared Spectropolarimeter (Cryo-NIRSP) instrument.
Michael Hahn +3 more
doaj +1 more source
Can the International Reference Ionosphere Model Predict Long‐Term Trends in the Ionosphere?
Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract The International Reference Ionosphere (IRI) model can partially reproduce ionospheric long‐term trends (LTTs), although not intentionally, provided that an appropriate effective ionospheric index is used. We evaluate how model predictions driven by a solar activity proxy (R12) and by an effective ionospheric proxy (IG12) can reproduce the ...
A. Pignalberi +3 more
wiley +1 more source
MHD waves in the solar north polar coronal hole
Astronomische Nachrichten, 2010 AbstractThe effects, hitherto not treated, of the temperature and the number density gradients, both in the parallel and the perpendicular direction to the magnetic field, of O VI ions, on the MHD wave propagation characteristics in the solar North Polar Coronal Hole are investigated.
Devlen, E., Pekunlu, E. R.
openaire +3 more sources
A new method for estimating global coronal wave properties based on their interaction with solar coronal holes [PDF]
Astronomy & Astrophysics, 2020 Among the effects of interactions between global coronal waves (CWs) and coronal holes (CHs) is the formation of reflected and transmitted waves. Observations of such events provide us with measurements of different CW parameters, such as phase speed and intensity amplitudes.
Piantschitsch, I. +2 more
openaire +2 more sources
On the Origin of a Broad Quasiperiodic Fast-propagating Wave Train: Unwinding Jet as the Driver
The Astrophysical Journal LettersLarge-scale extreme-ultraviolet waves commonly exhibit as single wave front and are believed to be caused by coronal mass ejections. Utilizing high spatiotemporal resolution imaging observations from the Solar Dynamics Observatory, we present two ...
Xinping Zhou +7 more
doaj +1 more source
Advanced Energy and Sustainability Research, Volume 7, Issue 4, April 2026.Ammonia oxidation reaction is a promising candidate for renewable energy conversion. The recent considerable progress in its mechanism understanding and catalyst development are summarized here along with the remaining challenges and perspectives regarding future development strategies.
Yeyu Deng +6 more
wiley +1 more source
Frequency-dependent Evolution of Propagating Intensity Disturbances in Polar Plumes
The Astrophysical JournalQuasiperiodic disturbances in EUV emission intensity, propagating along polar plumes in the solar corona, are frequently observed. Analysis of these propagating disturbances in the 171 Å bandpass of the Solar Dynamics Observatory/Atmospheric Imaging ...
Kyung-Suk Cho +3 more
doaj +1 more source
MHD Waves and Coronal Seismology: an overview of recent results
, 2012 Recent observations have revealed that MHD waves and oscillations are ubiquitous in the solar atmosphere, with a wide range of periods. We give a brief review of some aspects of MHD waves and coronal seismology which have recently been the focus of ...
Uchida Y., Wang T., Zajtsev V. V.
core +2 more sources
Dataset of Quiet Space Weather Periods for Ionospheric Studies
Earth and Space Science, Volume 13, Issue 4, April 2026.Abstract The ionosphere is a dynamic environment regularly affected from above and from below. This study identifies periods within the years 2000–2023 when the impact from above, driven by space weather, was minimal. The quiet space weather periods have wide usage for two types of ionospheric studies. At first, studies of isolated space weather events
Šimon Mackovjak +12 more
wiley +1 more source