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of 125
pro vyhledávání: '"HATHAWAY, DAVID H."'
Observations the Sun's photospheric magnetic field are often confined to the Sun-Earth line. Surface flux transport (SFT) models, such as the Advective Flux Transport (AFT) model, simulate the evolution of the photospheric magnetic field to produce m
Externí odkaz:
http://arxiv.org/abs/2404.04280
Autor:
Upton, Lisa A., Hathaway, David H.
Sunspot Cycle 25 over 3 years past the cycle minimum of December 2019. At this point, curve-fitting becomes reliable and consistently indicates a maximum sunspot number of 135+/-10 - slightly larger than Cycle 24's maximum of 116.4, but well below th
Externí odkaz:
http://arxiv.org/abs/2305.06516
We measure differential rotation and meridional flow in the Sun's surface shear layer by tracking the motions of the magnetic network seen in magnetograms from SOHO/MDI and SDO/HMI over solar cycles 23, 24, and the start of 25 (1996-2022). We examine
Externí odkaz:
http://arxiv.org/abs/2212.10619
The Sun's axisymmetric flows, differential rotation and meridional flow, govern the dynamics of the solar magnetic cycle and variety of methods are used to measure these flows, each with its own strengths and weaknesses. Flow measurements based on cr
Externí odkaz:
http://arxiv.org/abs/2107.07731
Autor:
Svalgaard, Leif, Hathaway, David H.
The Waldmeier Effect is the observation that the rise time of a sunspot cycle varies inversely with the cycle amplitude: strong cycles rise to their maximum faster than weak cycles. The shape of the cycle and thus the rise time does not depend on the
Externí odkaz:
http://arxiv.org/abs/2011.01330
Autor:
Hathaway, David H., Upton, Lisa A.
Publikováno v:
The Astrophysical Journal, 908, 160, 2021
Measurements of the large cellular flows on the Sun were made by local correlation tracking of supergranules seen in full-disk Doppler images obtained by the HMI instrument on the NASA SDO satellite. The hourly measurements were averaged over 34 days
Externí odkaz:
http://arxiv.org/abs/2006.06084
Akademický článek
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Autor:
Upton, Lisa A., Hathaway, David H.
Over the last decade there has been mounting evidence that the strength of the Sun's polar magnetic fields during a solar cycle minimum is the best predictor of the amplitude of the next solar cycle. Surface flux transport models can be used to exten
Externí odkaz:
http://arxiv.org/abs/1808.04868
Autor:
Hathaway, David H., Upton, Lisa A.
Evidence strongly indicates that the strength of the Sun's polar fields near the time of a sunspot cycle minimum determines the strength of the following solar activity cycle. We use our Advective Flux Transport (AFT) code, with flows well constraine
Externí odkaz:
http://arxiv.org/abs/1611.05106
With multiple vantage points around the Sun, STEREO and SDO imaging observations provide a unique opportunity to view the solar surface continuously. We use He II 304 A data from these observatories to isolate and track ten active regions and study t
Externí odkaz:
http://arxiv.org/abs/1511.04030