Results 51 to 60 of about 72,728 (314)

Heating and dynamics of the Solar atmosphere

CoRR, 2023
The solar atmosphere shows anomalous variation in temperature, starting from the 5500 K photosphere to the million-degree Kelvin corona. The corona itself expands into the interstellar medium as the free streaming solar wind, which modulates and impacts the near-Earth space weather.
openaire   +2 more sources

Nonzero Phase Shifts of Acoustic Waves in the Lower Solar Atmosphere Measured from Realistic Simulations and Their Role in Local Helioseismology

The Astrophysical Journal, 2023
Previous studies analyzing the evanescent nature of acoustic waves in the lower solar atmosphere, up to 300 km above the photosphere, have shown an unexpected phase shift of an order of 1 s between different heights.
M. Waidele, Junwei Zhao, I. N. Kitiashvili   +2 more
doaj   +1 more source

Rapid variations of Si IV spectra in a flare observed by interface region imaging spectrograph at a sub-second cadence

Frontiers in Astronomy and Space Sciences, 2022
We report on observations of highly-varying Si IV 1402.77 Å line profiles observed with the Interface Region Imaging Spectrograph (IRIS) during the M-class flare from 18 January 2022 at an unprecedented 0.8 s cadence.
Juraj Lörinčík, Juraj Lörinčík, Vanessa Polito, Vanessa Polito, Vanessa Polito, Bart De Pontieu, Bart De Pontieu, Bart De Pontieu, Sijie Yu, Nabil Freij, Nabil Freij   +10 more
doaj   +1 more source

Encyclopedia of 2D β′‐In2Se3 Growth Using Chemical Vapor Deposition: The Effects of Synthesis Parameters Onto Material Quality

Advanced Engineering Materials, EarlyView.
A distinct semi‐confined inner‐tube chemical vapor deposition geometry enables reproducible, large‐area growth of phase‐pure 2D β′‐In2Se3 from InI + Se precursors. Engineering local vapor transport and optimizing precursor delivery and temperature–time conditions yield uniform continuous films.
Dasun P. W. Guruge, P. Sanju S. Panawala, Joseph F. S. Fernando, Zhenhuan Chen, Chao Zhang, Dong‐Chen Qi, Liangzhi Kou, Konstantin L. Firestein, Dmitri V. Golberg   +8 more
wiley   +1 more source

Upper-mesospheric temperatures measured during intense substorms in the declining phase of the January 2005 solar proton events [PDF]

, 2008
Temperature measurements from the ALOMAR Weber Na lidar together with cosmic radio noise absorption measurements from IRIS and particle measurements from NOAA 15, 16 and 17 are used to study effects of geomagnetic activity on the polar winter upper ...
J. Stadsnes, H. Nesse Tyssøy, Honary, F., D. Heinrich, Nesse Tyssøy, H.N., Williams, B.P., Heinrich, D., B. P. Williams, D. S. Evans, F. Honary, Stadsnes, J., Hoppe, U.P., U.-P. Hoppe, Sorbo, M., Evans, D.S., M. Sørbø   +15 more
core   +1 more source

Cosmic sources of the Earth's atmosphere ionization (review)

Геофизический журнал, 2017
 Characteristics of the Earth's upper atmosphere vary constantly under the action of electromagnetic emission of the sun, solar wind, streams of galactic and solar cosmic rays as well as of precipitation of captured magnetosphere electrons.
L.V. Raychenko, G.V. Melnik
doaj   +1 more source

Multi-wavelength observations and modeling of a microflare: constraining non-thermal particle acceleration

Frontiers in Astronomy and Space Sciences, 2023
In this work we analyze a small B-class flare that occurred on 29 April 2021 and was observed simultaneously by the Interface Region Imaging Spectrograph (IRIS) and the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray instrument.
Vanessa Polito, Vanessa Polito, Marianne Peterson, Lindsay Glesener, Paola Testa, Sijie Yu, Katharine K. Reeves, Xudong Sun, Jessie Duncan   +8 more
doaj   +1 more source

Diagnosis of the solar atmosphere using solar oscillations [PDF]

Symposium - International Astronomical Union, 1988
I present a review of the art of using acoustic and gravity waves as a tool to probe the structure of the solar atmosphere. The principle ideas behind the technique are discussed and a small bouquet of results is presented. The current discrepancies are pointed out, and in the last section a few thoughts are let loose about the inversion of data to ...
openaire   +1 more source

Biomass Native Structure Into Functional Carbon‐Based Catalysts for Fenton‐Like Reactions

Advanced Functional Materials, EarlyView.
This study indicates that eight biomasses with 2D flaky and 1D acicular structures influence surface O types, morphology, defects, N doping, sp2 C, and Co nanoparticles loading in three series of carbon, N‐doped carbon, and cobalt/graphitic carbon. This work identifies how these structural factors impact catalytic pathways, enhancing selective electron
Wenjie Tian, Jingkai Lin, Zhihao Tian, Selusiwe Ncube, Huayang Zhang, Emiliano Cortés, Hongqi Sun, Shaobin Wang   +7 more
wiley   +1 more source

Investigating Alfvénic wave propagation in coronal open-field regions

, 2015
The physical mechanisms behind accelerating solar and stellar winds are a long-standing astrophysical mystery, although recent breakthroughs have come from models invoking the turbulent dissipation of Alfvén waves.
Morton, Richard, Tomczyk, Steve, Pinto, Rui   +2 more
core   +1 more source