Results 111 to 120 of about 10,729 (219)
The Astrophysical JournalThe origin of the slow solar wind is not well understood, unlike the fast solar wind that originates from coronal holes. In situ elemental abundances of the slow solar wind suggest that it originates from initially closed field lines that become open ...
Alexandros Koukras +2 more
doaj +1 more source
Multi-Thermal Segmentation of Solar Coronal Holes
, 2016 Here we present a poster describing a new multi-thermal segmentation method, to extract coronal boundaries from that of the quiet Sun.Our method uses 3 wavebands (171A, 193A and 211A) to exctract coronal holes and their ...
Garton, Tadhg, Gallagher, Peter
openaire +1 more source
White Light Coronograph (WLC) and Ultra-Violet Coronal Spectrometer (UVCS) [PDF]
The white light coronagraph (WLC) and ultraviolet coronal spectrometer (UVCS) together reveal the corona and the roots of the solar wind from 1.5 to 6 solar radii from Sun center.
Moore, R. L.
core +1 more source
The Astrophysical JournalDuring solar cycle minimum, polar coronal holes show a prominent radio brightening cap. The analysis of polar microwave enhanced radiation in polar coronal holes is helpful for understanding the magnetic field characteristics and the origin of the solar ...
Jing Huang +6 more
doaj +1 more source
Coronal magnetic structure and the latitude and longitude distribution of energetic particles, 1-5 AU [PDF]
The relation of the coronal magnetic field structure to the distribution of approximately 1 MeV protons in interplanetary space between 1 and 5 AU is discussed.
Mitchell, D. G., Roelof, E. C.
core +1 more source
Responses of a Coronal Hole to a Fast Flare-driven Coronal Wave
The Astrophysical Journal LettersCoronal waves, significant solar phenomena, act as diagnostic tools for scientists studying solar atmosphere properties. Here, we present a novel observation detailing how a coronal wave event, associated with an X5.0 class flare, influenced the ...
Xiaofan Zhang +14 more
doaj +1 more source
Ion Charge States in the Fast Solar Wind: New Data Analysis and Theoretical Refinements
, 2007 We present a further investigation into the increased ionization observed in element charge states in the fast solar wind compared to its coronal hole source regions.
Hasegawa A. +2 more
core +1 more source
Coronal Pseudo-Streamer and Bipolar Streamer Observed by SOHO/UVCS in March 2008
, 2015 The last solar minimum is characterized by several peculiar aspects and by the presence of a complex magnetic topology with two different kinds of coronal streamers: pseudo-streamers and bipolar streamers.
Abbo, Lucia +3 more
core +1 more source
Hydrogen Lyman-alpha and Lyman-beta radiances and profiles in polar coronal holes
, 2009 The hydrogen Lyman-alpha plays a dominant role in the radiative energy transport in the lower transition region, and is important for the stud- ies of transition-region structure as well as solar wind origin. We investigate the Ly-alpha profiles obtained
Dammasch +12 more
core +1 more source
Source Materials and Heating of Alfvénic Slow and Hot Solar Wind Revealed by Heavy Ions
The Astrophysical JournalThis work quantitatively studies the differences of heavy ions among non-Alfvénic slow wind (N-ASSW), classical fast wind (FSW), and Alfvénic slow and hot wind (ASSW and AHSW) by effect size and Kolmogorov–Smirnov statistic.
Shuyi Meng, Shuo Yao
doaj +1 more source