Results 111 to 120 of about 1,261,581 (220)

The Geometric Spreading of Coronal Plumes and Coronal Holes [PDF]

, 1998
The geometric spreading in plumes and in the interplume region in coronal holes is calculated, using analytic and numerical theoretical models, between 1.0 and 5.0 solar radius. We apply a two-scale approximation that permits the rapid local spreading at
Wu, S. T., Cuseri, I., Poletto, G., Suess, S. T., Wang, A.-H.   +4 more
core  

Topological structure of the magnetic solar corona [PDF]

, 2007
The solar corona is a highly complex and active plasma environment, containing many exotic phenomena such as solar flares, coronal mass ejections, prominences, coronal loops, and bright points.
Maclean, Rhona Claire
core   +1 more source

MHD Modeling of Differential Rotation in Coronal Holes

, 2004
The photosphere and the magnetic flux therein undergo differential rotation. Coronal holes appear to rotate almost rigidly. Magnetic reconnection has been invoked to reconcile these phenomena.
Mikic, Zoran, Riley, Pete, Linker, Jon A., Lionello, Roberto   +3 more
core  

Are subsurface flows and coronal holes related?

, 2012
International audienceWe study synoptic maps of solar subsurface flows covering six Carrington rotations (2050 to 2055). The subsurface flows are determined with a ring-diagram analysis of GONG high-resolution Doppler data.
Harra, Louise K., González Hernández, J. I., van Driel-Gesztelyi, Lidia, Howe, R., Baker, Deborah, Komm, Rudolf W.   +5 more
core   +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

Source Materials and Heating of Alfvénic Slow and Hot Solar Wind Revealed by Heavy Ions

The Astrophysical Journal
This 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

Signatures of Nonlinear Waves in Coronal Plumes and Holes

, 1999
In recent Ultraviolet Coronagraph Spectrometer/Solar and Heliospheric Observatory (UVCS/SOHO) White Light Channel (WLC) observations we found quasi-periodic variations in the polarized brightness (pB) in the polar coronal holes at heliocentric distances ...
Ofman, Leon
core  

Simulation of Thermal Nonequilibrium Cycles in the Solar Wind

The Astrophysical Journal
Thermal nonequilibrium (TNE) is a condition of the plasma in the solar corona in which the local rate of energy loss due to radiation increases to the point that it cannot be sustained by the various heating terms acting on the plasma, precluding the ...
Roger B. Scott, Jeffrey W. Reep, Mark G. Linton, Stephen J. Bradshaw   +3 more
doaj   +1 more source

Investigating the Behavior and Spatiotemporal Variations of Green-line Emission in the Solar Corona

The Astrophysical Journal Supplement Series
Understanding coronal structure and dynamics can be facilitated by analyzing green-line emission, which enables the investigation of diverse coronal structures such as coronal loops, streamers, coronal holes, and various eruptions in the solar atmosphere.
Jacob Oloketuyi, Yu Liu, Linhua Deng, Abouazza Elmhamdi, Fengrong Zhu, Ayodeji Ibitoye, Opeyemi Omole, Feiyang Sha, Qiang Liu   +8 more
doaj   +1 more source

Predicting the Solar Wind Speed and Interplanetary Sector Structure during Solar Cycles 21–25

The Astrophysical Journal
We use potential-field source-surface (PFSS) extrapolations of photospheric field data to predict the solar wind speed and interplanetary sector structure at Earth during solar cycles 21–25, and compare the results with in situ measurements.
Y.-M. Wang, N. R. Sheeley Jr.
doaj   +1 more source