A Numerical Study of the Solar Cycle

Nakagawa, Y.

doi:10.1017/s0074180900023184

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…The systematic equatorward drift of the region of occurrence of sunspots (the 'butterfly diagram') may find an explanation in a study by Nakagawa (1971). In his model largescale deep-seated whirling circulation patterns, oriented along the meridians, occur on either Akasofu (2015) hemisphere.…”

Section: Unipolar Magnetic Regions; Their Significance For Solar Varimentioning

confidence: 97%

A Remarkable Recent Transition in the Solar Dynamo

et al. 2016

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We summarize the major aspects of the remarkable, fairly long lasting period (∼ 2005 to ∼ 2010) of low solar activity, that we will call the Transition. It is the transitional stage between the Grand Maximum of the 20th century and a forthcoming (most probably Regular) episode of solar activity. The various kinds of activity in the functioning of the equatorial components of the solar dynamo before and during the Transition are summarized. While the behavior of unipolar magnetic regions and their rest-latitudes already gave very early indications -mid 20th century -of the forthcoming Transition, more such indications became available around 1995 and the main part of it occurred between 2005 and 2010. Some of the inferences are discussed. We submit the hypothesis that the solar tachocline undergoes pulsations and we present some helioseismic evidences. In that scenario we find that its equatorial part has moved downward over a fairly small semi-amplitude (∼ 0.03 solar radii) during the time of the Transition. There are several indications, apart from this 'pulsation', that the tachocline may even be pulsating with still smaller amplitudes in more modes. We speculate about the physical mechanism(s).

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Section: Unipolar Magnetic Regions; Their Significance For Solar Varimentioning

confidence: 97%

A Remarkable Recent Transition in the Solar Dynamo

et al. 2016

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“…The primary and secondary mirrors (external) will be actively cooled at a temperature of ∼6 Kelvin, while the intermediate components will be cooled to ∼5K and the detector-box elements to sub-Kelvin temperatures (Nakagawa, 2008 …”

Section: Optical Componentsmentioning

confidence: 99%

Development of the SAFARI Instrument Simulator

Sadeghi

Naylor

Hayton

2009

SPICA Joint European/Japanese Workshop

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Three instruments have been proposed for the JAXA-ESA Space Infrared Telescope for Cosmology and Astrophysics (SPICA) Mission: a mid-infrared coronagraph, a mid-infrared camera and spectrometer, and a far-infrared imaging spectrometer (SAFARI). An overview of the SA-FARI instrument simulator currently being developed is presented.The simulator will not only find use during the design phase of the instrument, but also during the evaluation of the performance of the flight model during the ground test campaigns. Through validation of the simulator by using ground test data, it will be possible to predict reliably the in-orbit performance of SAFARI. Specifically, the simulator will be used to investigate the scientific capabilities of the instrument at three resolving powers (λ/Δλ = 3, 100, 2000) over the wavelength range 30-210 μm, nominally separated into three sub-bands (Swinyard & Nakagawa, 2008).

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U.S. National Report, 1967–1971: Fifteenth General Assembly, IUGG: Solar Activity as Relevant to Solar Planetary Relationships

Newkirk

1971

EoS Transactions

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A review of those aspects of solar activity relevant to solar planetary relationships is nearly impossible to construct. On the one hand there is the temptation to argue that all solar physics is ultimately related to understanding such relationships. A brief but comprehensive review of progress in solar physics in the last 4 years is clearly beyond the capability of a single author. On the other hand there is the danger that a single author's conception of what is relevant is most certainly distorted. Thus areas of important progress may be slighted or totally ignored. The present review is generally restrictive rather than inclusive. It is organized to discuss the most outstanding developments in the areas of the general activity cycle, active regions, the role of magnetic fields, transient events, and solar‐geomagnetic relations.

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A Numerical Study of the Solar Cycle

Cited by 3 publications

References 25 publications

A Remarkable Recent Transition in the Solar Dynamo

A Remarkable Recent Transition in the Solar Dynamo

Development of the SAFARI Instrument Simulator

U.S. National Report, 1967–1971: Fifteenth General Assembly, IUGG: Solar Activity as Relevant to Solar Planetary Relationships

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