Civilizational Imperatives

Charbonneau, Oliver

doi:10.1515/9781501750731

Cited by 5 publications

(3 citation statements)

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“…A functional relation can therefore be expected between the polar (poloidal) field of minimum activity epochs and the strengths of the following activity cycles (Schatten et al 1978). A tight correlation of this type is confirmed observationally (Muñoz-Jaramillo et al 2013;Hathaway & Upton 2016) and reproduced by dynamo models (Charbonneau 2020;Kumar et al 2021). The polar field strength is recognised as a robust precursor for solar cycles' strength (Petrovay 2020;Nandy 2021).…”

Section: Large Asymmetry In Grand Minimamentioning

confidence: 85%

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Dynamo Model for Nort-South Asymmetry of Solar Activity

Kitchatinov¹,

Observatory²,

Nepomnyashchikh³

2019

Proceedings of the 23rd All-Russia Conference on Solar and Solar-Terrestrial Physics

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Observations reveal a relatively small but statistically significant North-South (NS) asymmetry in sunspot activity varying on a time scale of several solar cycles. This paper proposes a dynamo model for the phenomenon of long-term NS asymmetry. The model separates dynamo equations for magnetic fields of dipolar and quadrupolar equatorial parity. The NS asymmetry results from the superposition of dipolar and quadrupolar fields. Model computations confirm the formerly proposed excitation of the quadrupolar dynamo mode by a dominant dipolar mode mediated by the equator-symmetric fluctuations in the α-effect as a mechanism for the long-term NS asymmetry. An analytically solvable example of oscillations excited by short-term random forcing is given to justify the numerical result of NS asymmetry coherent on a time scale of several (about 6 in the present model) solar cycles resulting from random variations in the α-effect on a time scale of one solar rotation. The model computations show the phase locking phenomenon of dipolar and quadrupolar fields oscillating predominantly in phase (northern type asymmetry) or in antiphase (southern type asymmetry) with relatively short irregular transitions between these two states. Large asymmetry in the simulated Grand minima is found and explained by weak magnetic quenching of the α-effect during the minima. The possibility of polar field asymmetry in activity minima as a precursor of sunspot asymmetry in the following activity cycles is discussed based on the dynamo model and observations.

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Section: Large Asymmetry In Grand Minimamentioning

confidence: 85%

“…Dynamo models with fluctuating parameters are known to show transient epochs of strongly reduced field strength modeling the Grand minima of solar activity (Charbonneau 2020). The epochs of weak magnetic fields usually -though not always -show up-normal NS asymmetry.…”

Section: Large Asymmetry In Grand Minimamentioning

confidence: 99%

Dynamo Model for Nort-South Asymmetry of Solar Activity

Kitchatinov¹,

Observatory²,

Nepomnyashchikh³

2019

Proceedings of the 23rd All-Russia Conference on Solar and Solar-Terrestrial Physics

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“…U.S. colonial rule, with its far-reaching transformational agendas, challenged Moro and Lumad societies, most of whom were accustomed to either limited Spanish interference or, in certain parts of the Mindanaoan interior, complete self-governance. 84 Natives responded to the rationalization and remapping of their lands with suspicion, and at times outright hostility. Moros and Lumad became figures of fear for Americans, who portrayed them as violent and unbeholden to the colonial order of things.…”

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“A New West in Mindanao”: Settler Fantasies on the U.S. Imperial Fringe

Charbonneau

2019

J. gilded age prog. era

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This essay analyzes white settler formations in the Southern Philippines during the early decades of the twentieth century. Occupied by the United States in the wake of the Spanish-American War, the Muslim-majority regions of Mindanao and the Sulu Archipelago became sites of colonial experimentation and reconfiguration. This led to a brief-but-concerted push by Euro-American fortune seekers to settle the “Muslim South.” Supported by U.S. policy makers and colonial officials, white colonists were drawn to Mindanao-Sulu by visions of permanent settlement and limitless economic opportunity. This analysis contends that settler attempts to build a “white man's country” in the Southern Philippines were shaped by vernaculars and modes of conquest developed on the continental frontier. It interrogates the creation of transoceanic frontier spaces in Mindanao-Sulu and the practical attempts to exploit them, which drew inspiration from diverse sources in the American West and across the colonized globe. In its study of settler fortunes and failures, the essay blurs distinctions between national and imperial peripheries, and contributes to a growing scholarly interest in reassessing the importance of U.S. extraterritorial possessions in the late nineteenth and early twentieth centuries.

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2021

Int Rev of Soc His

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Civilizational Imperatives

Cited by 5 publications

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Dynamo Model for Nort-South Asymmetry of Solar Activity

Dynamo Model for Nort-South Asymmetry of Solar Activity

“A New West in Mindanao”: Settler Fantasies on the U.S. Imperial Fringe

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