Results 91 to 100 of about 10,701,163 (203)

Corona Australis 151: An extremely young protostar

Astronomy & Astrophysics
Context. Prestellar cores are the birthplace of stars and planetary systems, but they are short-lived objects since the initial stages of dense core evolution, collapse, and the formation of a protostellar seed are fast. In an effort to build a catalogue
Redaelli E., Spezzano S., Caselli P., Harju J., Arzoumanian D., Sipilä O., Belloche A., Wyrowski F., Pineda J. E., Jensen S., Misugi Y., Majerczyk G.   +11 more
doaj   +1 more source

Spatially Coherent and Intermittent Alfvénic Fluctuations in Solar Polar Spicules

The Astrophysical Journal
Alfvénic fluctuations are a possible mechanism for transporting energy from the lower solar atmosphere into the corona, with spicules acting as dynamic conduits for this transfer.
Edris Tajfirouze, Christopher H. K. Chen, Richard J. Morton, Peter R. Young   +3 more
doaj   +1 more source

SPECTROSCOPIC INVESTIGATIONS OF GALACTIC CLUSTERS WITH ASSOCIATED CEPHEID VARIABLES. III. COLLINDER 394 AND BB SGR

Odessa Astronomical Publications, 2019
We present the results of a spectro- scopic and photometric investigation of 20 objects from the open cluster Collinder 394, which contains the Cepheid BB Sgr.
I. A. Usenko, A. Yu. Kniazev, I. Yu. Katkov, V. V. Kovtyukh, T. V. Mishenina, A. S. Miroshnichenko, D. G. Turner   +6 more
doaj   +1 more source

Solar wind Acceleration from the Upper Chromosphere to the Corona in Coronal Hole Regions [PDF]

, 1998
The dynamic behavior of the plasma in the chromosphere/transition region /inner corona is vital for the acceleration of the solar wind. With new theoretical descriptions of the solar atmosphere and corona, and the increased observational possibilities ...
Esser, Ruth
core  

Radiation Synthesis Tools: Arbitrary Perspective Multiwavelength Radiation Synthesis for Solar Magnetohydrodynamic Simulations

The Astrophysical Journal
Solar magnetohydrodynamic (MHD) simulation is an indispensable method for studying solar activities. Modern MHD simulations are increasingly realistic and need to be synthesized with multiwavelength radiation to validate observations.
Wentai Fu, Yiwei Ni, Yuheng Zhang, Guoyin Chen, Bitao Wang, Jinhan Guo, Chen Xing, Yang Guo, Mingde Ding   +8 more
doaj   +1 more source

Determining the 3D Dynamics of Solar Flare Magnetic Reconnection

The Astrophysical Journal
Solar flares are major space weather events that result from the explosive conversion of stored magnetic energy into bulk motion, plasma heating, and particle acceleration.
Joel T. Dahlin, Spiro K. Antiochos, Peter F. Wyper, Jiong Qiu, C. Richard DeVore   +4 more
doaj   +1 more source

Chromospheric Flashes in a Solar Pore: Insights from Multiline Spectropolarimetric Diagnostics

The Astrophysical Journal
Solar pores are strongly magnetized regions without a photospheric penumbra, with predominantly vertical magnetic fields. We present a multiline investigation of flashes in a pore using high-resolution Swedish Solar Telescope observations in Fe I 6302 ...
Sandeep Dubey, Christian Beck, Rahul Yadav, Tobias Felipe, Shibu K. Mathew   +4 more
doaj   +1 more source

Observations of the 1963 July 20 Solar Eclipse: I. Spectroscopic Separation of the F and K Components of the Solar Corona at Large Distances from the Sun [PDF]

Monthly Notices of the Royal Astronomical Society, 1966
D. E. Blackwell, A. D. Petford
openaire   +1 more source

Observations of Temporal Variations in the 5303 Å Emission Line During a Coronal Mass Ejection Without Any Associated Solar Flare

The Astrophysical Journal
Reports using total solar eclipse data indicate that the 5303 Å emission line is a promising tool for observing the thermodynamic changes due to coronal mass ejections (CMEs) close to the Sun.
V. Muthu Priyal, R. Ramesh, Jagdev Singh, K. Sasikumar Raja   +3 more
doaj   +1 more source

Knot Probability of Random Magnetic Field Lines

Universe
In this paper, we apply several latest results from statistical physics on the probability and energy of knotting to study the knotted field lines in solar corona.
Anda Xiong, Shangbin Yang, Xin Liu
doaj   +1 more source