Zobrazeno 1 - 10
of 82
pro vyhledávání: '"David H. Hathaway"'
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 2, p 114 (2024)
Observations of 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 pr
Externí odkaz:
https://doaj.org/article/638bcebd6f3342b982f3f81473eca2ef
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 9 (2022)
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 exa
Externí odkaz:
https://doaj.org/article/b52e3d22f6b74a248921f0e7574b22fd
Autor:
David H. Hathaway
Publikováno v:
Living Reviews in Solar Physics, Vol 12, p 4 (2015)
The solar cycle is reviewed. The 11-year cycle of solar activity is characterized by the rise and fall in the numbers and surface area of sunspots. A number of other solar activity indicators also vary in association with the sunspots including; the
Externí odkaz:
https://doaj.org/article/84c62c6c341d4d1a9b76deebaf3b52b1
Autor:
David H. Hathaway
Publikováno v:
Living Reviews in Solar Physics, Vol 7, p 1 (2010)
The Solar Cycle is reviewed. The 11-year cycle of solar activity is characterized by the rise and fall in the numbers and surface area of sunspots. We examine a number of other solar activity indicators including the 10.7 cm radio flux, the total sol
Externí odkaz:
https://doaj.org/article/971d1438c8144e72b33cebe8bf78271e
Autor:
David H. Hathaway, Lisa Upton
Publikováno v:
Geophysical Research Letters. 45:8091-8095
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5072af90225621074ba8468bc9a56ce1
https://doi.org/10.1029/2018gl078387
https://doi.org/10.1029/2018gl078387
Publikováno v:
The Astrophysical Journal. 917:100
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5a680a57852a374045bffc6891ba587
https://doi.org/10.3847/1538-4357/ac0a80
https://doi.org/10.3847/1538-4357/ac0a80
Autor:
Lisa Upton, David H. Hathaway
Publikováno v:
The Astrophysical Journal. 908:160
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdb6510f7e3b4797ff36d77ad54ed42d
https://doi.org/10.3847/1538-4357/abcbfa
https://doi.org/10.3847/1538-4357/abcbfa
Autor:
David H. Hathaway
Publikováno v:
Solar Physics. 286:347-356
Daily records of sunspot group areas compiled by the Royal Observatory, Greenwich, from May of 1874 through 1976 indicate a curious history for the penumbral areas of the smaller sunspot groups. On average, the ratio of penumbral area to umbral area
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03b149b674453b118f3f86d07a5ab394
https://doi.org/10.1007/s11207-013-0291-y
https://doi.org/10.1007/s11207-013-0291-y
Autor:
David H. Hathaway, Lisa Upton
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9e0253de32d55920d1b0e98f06433ff
http://arxiv.org/abs/1611.05106
http://arxiv.org/abs/1611.05106
Autor:
David H. Hathaway
Publikováno v:
Space Science Reviews. 144:401-412
Predicting the behavior of a solar cycle after it is well underway (2–3 years after minimum) can be done with a fair degree of skill using auto-regression and curve fitting techniques that don’t require any knowledge of the physics involved. Pred
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a1012e54e595d55a7a7e25d5d12ad7b
https://doi.org/10.1007/s11214-008-9430-4
https://doi.org/10.1007/s11214-008-9430-4