Low-frequency wave excitation by weak nonlinear interaction of two high-frequency pump waves: part II-experiments
This paper presents an experimental study of the characteristics of the LF wave excited in a hot magnetized plasma column by weak nonlinear interaction of two HF pump waves. These experimental features are systematically compared with theoretical ones which have been established in a previous theoretical paper.
Nonlinear scattering from a warm plasma column
When a plane electromagnetic wave impinges normally on a plasma column, with its magnetic field vector parallel to the axis of the column, a series of (Tonks‐Dattner) resonances are excited which have been described previously in the linear regime, by a warm plasma analysis using a scalar electron pressure and an inhomogeneous radial electron density profile. In this paper, the theory is extended to the weakly nonlinear regime, assuming a parabolic electron density profile. The nonlinear scattered power is obtained. The excitation of dipole resonances at two different frequencies produces a predominantly quadrupolar radiation pattern with minima in the direction of the incident wave vectors and approximately at right angles to it. In general, there is no nonlinear power radiated in the forward and backward directions. Numerical results for the nonlinear scattering coefficients are obtained in the special case of second‐harmonic generation at dipole resonance.
Mutiny Echoes: India, Britons, and Charles Dickens's A Tale of Two Cities
This essay asks what, if any, import the Indian ““Mutiny”” of 1857 had on A Tale of Two Cities (1859), Charles Dickens�s fictionalized account of the French Revolution. Begun shortly after the Indian uprising started, Dickens�s historical novel appears studiously to avoid any mention of events on the Indian subcontinent, even though these events preoccupied and enraged the author. Few scholars have attended to the question of A Tale of Two Cities and the ““Mutiny,”” but when they have, scholars have looked for analogies between India and Dickens�s account of the French Revolution. In this essay, by contrast, I examine A Tale of Two Cities in a larger context——of Britons9 response to the Uprising, of Dickens9s short stories and essays in Household Words in the years before the ““Mutiny”” and immediately after, of Dickens9s disenchantment with aspects of British culture, and of his need to articulate a national identity grounded in action. I argue that the events in India were the match that ignited Dickens9s already established midcentury interests in national identity, nobility, and masculine heroism. I do not wish to suggest that A Tale of Two Cities is an Indian ““Mutiny”” novel, but rather that it is a novel about the ““Making of Britons,”” an important endeavor for an author who was intensely dissatisfied with the Britain that he saw around him.