Results 71 to 80 of about 427 (166)

Connecting the Low to High Corona: Propagating Disturbances as Tracers of the Near-Sun Solar Wind

The Astrophysical Journal
We revisit a quiet 14 day period of solar minimum during 2008 January and track substreamer propagating disturbances (PDs) from low heights in STEREO/EUVI to the extended corona through STEREO/COR1 and into STEREO/COR2 along nonradial paths that trace ...
Nathalia Alzate, Simone Di Matteo, Huw Morgan, Nicholeen Viall, Angelos Vourlidas   +4 more
doaj   +1 more source

Turbulent Suppression of Alfvénic Wave Resonances in Coronal Loops

The Astrophysical Journal
Alfvénic wave turbulence is a leading mechanism for explaining the heating of the solar corona and the acceleration of the solar wind. Alfvénic waves are observed to be prevalent throughout the inner corona.
Edris Tajfirouze, Richard Morton, Mahboubeh Asgari-Targhi   +2 more
doaj   +1 more source

Velocity and Density Fluctuations in the Quiet Sun Corona

The Astrophysical Journal
We investigate the properties and relationship between Doppler velocity fluctuations and intensity fluctuations in the off-limb quiet Sun corona. These are expected to reflect the properties of Alfvénic and compressive waves, respectively.
Michael Hahn, Xiangrong Fu, Stefan J. Hofmeister, Yifan Huang, Alexandros Koukras, Daniel Wolf Savin   +5 more
doaj   +1 more source

Correlated Quasiperiodic Pulsations in Type III Radio Bursts and Solar EUV Emission, Jetlets and Magnetic Fields: Comparisons of Intervals with and without Type III Storms

The Astrophysical Journal
Solar p -modes are ∼5 minute acoustic waves, which can be used as helioseismological diagnostics of the Sun’s subsurface. Recent studies relate them to quasiperiodic pulsations (QPPs) identified in X-rays, radio waves, and extreme ultraviolet (EUV ...
C. Cattell, L. Glesener, E. L. M. Hanson, Y. Kim, T. Mahaffey, R. B. Masek, M. Phillips, J. C. Buitrago-Casas, J. Martínez Oliveros, M. Pulupa, T. Ervin, S. Badman   +11 more
doaj   +1 more source

Picoflares in the Quiet Solar Corona: Solar Orbiter Observations Halfway to the Sun

13 pages, 7 figures, submitted to Astronomy & Astrophysics (A&A)
Podladchikova, O., Warmuth, A., Harra, L., Dolla, L., Verbeeck, C., Mierla, M., Rodriguez, L., Parenti, S., Georgoulis, M. K., Hofmeister, S. J., Engler, N., West, M. J., Veronig, A. M., Antolin, P., Purkhart, S., Long, D. M., Buchlin, É., Haberreiter, M., Zhukov, A. N., Safari, H., Battaglia, A. F., Soubrié, E., Büchel, V., Gissot, S., De Groof, A., Gyo, M., Halain, J. P., Inhester, B., Kraaikamp, E., Müller, D., Pfiffner, D., Rochus, P., Schuller, F., Smith, P. J., Schmutz, W., Stegen, K.   +35 more
openaire   +2 more sources

Metric and Decimetric Observations of the Quiet Solar Corona

, 1999
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and ...
Marque, C., Lantos, P., Delouis, J. M., Alissandrakis, C.   +3 more
openaire   +1 more source

Chromospheric evaporation as the driver of helium enrichment in active region solar wind: A case study

Astronomy & Astrophysics
Context. The physical mechanisms of helium abundance (AHe) depletion in the corona and solar wind are closely linked to coronal heating, solar wind origin, and acceleration processes. The relationships between the AHe in the solar wind and the properties
Ma Chi, Fu Hui, Madjarska Maria S., Shi Xinzheng, Huang Zhenghua, Xia Lidong   +5 more
doaj   +1 more source

Full-disk spectroscopy of the solar corona across a solar cycle with Hinode/EIS

Frontiers in Astronomy and Space Sciences
The structure and dynamics of the solar corona evolve with the Sun’s magnetic cycle, yet how this variability manifests in the disk-integrated, Sun-as-a-star observables used in stellar activity studies remains poorly constrained. We compile 18 full-disk
James McKevitt, James McKevitt, Ignacio Ugarte-Urra, Peter R. Young, Peter R. Young   +4 more
doaj   +1 more source

Unravelling the nonthermal emissions from the quiet solar corona with the SKA

Investigation of the nonthermal emissions from the quiet solar corona has been rather limited. This primarily stems from the fact that the emission is expected to be quite weak and very high dynamic range images are required to detect such emissions. Although, the few detections of the nonthermal emissions have all come from the radio band, the past ...
Mondal, Surajit, Oberoi, Divya, Sharma, Rohit, Zhang, Peijin, Kansabanik, Devojyoti, Chen, Xingyao, Kontar, Eduard   +6 more
openaire   +2 more sources

Source Region of the Solar Wind: Statistics of the Doppler Velocities at the Chromosphere

The Astrophysical Journal Letters
The solar wind has been extensively studied recently with in situ observations, and the understanding of its counterpart near the solar surface has also progressed significantly.
Fu Yu, Shihao Rao, Jie Zhao, Chuan Li, Yang Su, Jinsong Zhao, Ye Qiu, Mingde Ding, Cheng Fang, Hui Li, Weiqun Gan   +10 more
doaj   +1 more source