The floor in the solar wind: status report

Cliver, E. W.

doi:10.1017/s1743921312004814

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…This substantiated an earlier prediction based on direct polar field measurements for three solar cycles [39]. The notion of a floor in the solar wind, which has implications for the origin of the slow solar wind and the long-term variation of the galactic cosmic intensity, found support in the identification of a minimal magnetic state on the Sun during the extended solar minimum between cycles 23 and 24 [40,41].…”

Section: Long-term Solar Wind Reconstructionsupporting

confidence: 85%

Space Weather Prediction

Henney¹,

Radick²,

Norquist³

et al. 2014

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Section: Long-term Solar Wind Reconstructionsupporting

confidence: 85%

Space Weather Prediction

Henney¹,

Radick²,

Norquist³

et al. 2014

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“…To generate aurora at middle and low latitudes requires a dawn-dusk electric field, which in turn, requires a roughly radially directed solar wind carrying a B z magnetic field. Additionally, the energy to accelerate ions and electrons toward Earth and generate aurora by bombarding oxygen and nitrogen atoms is supplied from the kinetic energy density of the solar wind flow (Cowley 1991). We conclude then, that Parker's suggestion that there might not be any solar wind at all, is not consistent with these observations.…”

Section: Aurora Observationsmentioning

confidence: 74%

Inferring the Structure of the Solar Corona and Inner Heliosphere During the Maunder Minimum Using Global Thermodynamic Magnetohydrodynamic Simulations

Riley

Lionello

Linker

et al. 2015

ApJ

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Observations of the Sun's corona during the space era have led to a picture of relatively constant, but cyclically varying solar output and structure. Longer-term, more indirect measurements, such as from 10 Be, coupled by other albeit less reliable contemporaneous reports, however, suggest periods of significant departure from this standard. The Maunder Minimum was one such epoch where:(1) sunspots effectively disappeared for long intervals during a 70 yr period; (2) eclipse observations suggested the distinct lack of a visible K-corona but possible appearance of the F-corona; (3) reports of aurora were notably reduced; and (4) cosmic ray intensities at Earth were inferred to be substantially higher. Using a global thermodynamic MHD model, we have constructed a range of possible coronal configurations for the Maunder Minimum period and compared their predictions with these limited observational constraints. We conclude that the most likely state of the corona during-at least-the later portion of the Maunder Minimum was not merely that of the 2008/2009 solar minimum, as has been suggested recently, but rather a state devoid of any large-scale structure, driven by a photospheric field composed of only ephemeral regions, and likely substantially reduced in strength. Moreover, we suggest that the Sun evolved from a 2008/2009-like configuration at the start of the Maunder Minimum toward an ephemeral-only configuration by the end of it, supporting a prediction that we may be on the cusp of a new grand solar minimum.

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“…Cliver, Boriakoff, and Bounar (1998) extrapolated observed solar wind variations to the MM conditions and suggested that average velocities have an upper limit of 340 ± 50 km s −1 , and that of the interplanetary magnetic field, 0.3 ± 0.1 nT. Idea of the lowest conceivable solar wind magnetic field (the floor) was developed by Svalgaard and Cliver (2007) and Cliver (2012).…”

Section: Introductionmentioning

confidence: 98%

Indirect Solar Wind Measurements Using Archival Cometary Tail Observations

et al. 2018

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The paper addressed to the problem of the solar wind behaviour during the Maunder Minimum. Records on plasma tails of comets would allow to shed light on the physical parameters of the solar wind in the past. We analyse descriptions and drawings of comets to the eighteenth century. To differentiate dust and plasma tails, we address to their color, shape and orientation. Basing on the calculations made by F.A. Bredikhin, we found that deviation of cometary tails from the antisolar direction on average exceeded 10 • , that is typical for dust tails. Catalogues of Hevelius and Lubieniecki are also examined. The first indication of plasma tail was revealed only for Great comet C/1769 P1.

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The floor in the solar wind: status report

Cited by 6 publications

References 22 publications

Space Weather Prediction

Space Weather Prediction

Inferring the Structure of the Solar Corona and Inner Heliosphere During the Maunder Minimum Using Global Thermodynamic Magnetohydrodynamic Simulations

Indirect Solar Wind Measurements Using Archival Cometary Tail Observations

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