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Upflows in the Upper Solar Atmosphere
Spectroscopic observations at extreme- and far-ultraviolet wavelengths have revealed systematic upflows in the solar transition region and corona. These upflows are best seen in the network structures of the quiet Sun and coronal holes, boundaries of active regions, and dimming regions associated with coronal mass ejections. They have been intensively studied in the past two decades because they are likely to be closely related to the formation of the solar wind and heating of the upper solar atmosphere. We present an overvi ...
Tian, Hui; Harra, Louise; Baker, Deborah; Brooks, David; Xia, Lidong;
Published by: Solar Physics Published on: 03/2021
YEAR: 2021   DOI: 10.1007/s11207-021-01792-7
Active regions; velocity field; Coronal holes; coronal mass ejections; low coronal signatures; Heating; coronal; Spectral line; broadening; Astrophysics - Solar and Stellar Astrophysics
Sensitivity of solar wind mass flux to coronal temperature
Solar wind models predict that the mass flux carried away from the Sun in the solar wind should be extremely sensitive to the temperature in the corona, where the solar wind is accelerated. We perform a direct test of this prediction in coronal holes and active regions using a combination of in situ and remote sensing observations. For coronal holes, a 50\% increase in temperature from 0.8 to 1.2 MK is associated with a tripling of the coronal mass flux. This trend is maintained within active regions at temperatures over 2 M ...
Stansby, D.; Bercic, L.; Matteini, L.; Owen, C.; French, R.; Baker, D.; Badman, S.;
Published by: Astronomy and Astrophysics Published on: jun
YEAR: 2020   DOI: "10.1051/0004-6361/202039789"