Magnetic fluctuation and cosmic ray diurnal variations

A unified theory of cosmic ray diurnal variations has been proposed in which the first 3 harmonics of the cosmic ray daily variation all results from a single anisotropy produced by the combined effects of adiabatic focusing and anisotropic pitch angle scattering. The theoretical description of steady state cosmic ray anisotropies are simplified and improved. Preliminary results of a study of correlations between cosmic ray diurnal variations and the fluctuation characteristics of the interplanetary magnetic field are presented and discussed in light of the theory

Love and Ethics in the Works of J. M. E. McTaggart

This dissertation attempts to make contributions to normative ethics and to the history of philosophy. First, it contributes to the defense of consequentialist ethics against objections grounded upon the value of loving relationships. Secondly, it provides the first systematic account of John M. E. McTaggart’s (1866-1925) ethical theory and its relation to his philosophy of love. According to (maximizing) consequentialist ethics, it is always morally wrong to knowingly do what will make the world worse-off than it could have been (i.e., had one chosen one of the other courses of action available to one at the time). Many consequentialists also recognize that love is one of the most important goods worth pursing for its own sake and so this implies a strong duty to promote love. Recently, however, philosophers (such as Stocker, Cocking, Oakley, and Badhwar) have outlined what I call the “love-based objection.” It argues that consequentialism ought to be rejected on its own terms because a commitment to maximizing aggregate overall goodness precludes forming the kinds of commitments necessary for highly valuable loving relationships. Other philosophers (such as Railton and Mason), however, have argued that a particular kind of consequentialist theory (i.e., “sophisticated consequentialism”) that recognizes the intrinsic value of love and that restricts evaluations based on maximizing goodness to only the most fundamental realms of moral evaluation and guidance overcomes the love-based objection. While philosophers have indicated how to overcome the objection through sophisticated consequentialism, the task of constructing a plausible version of such a system is currently ongoing. This dissertation argues that, more than fifty years before this contemporary debate started, McTaggart outlined a version of consequentialism called “Ideal Utilitarianism” that can (with some supplementation) overcome recent love-based objections in the way suggested by Railton and Mason. McTaggart’s work in moral philosophy, therefore, has a previously unrecognized relevance to contemporary issues in normative ethics and so his contributions ought to be considered alongside other, currently more prominent, ethicists of his day such as Hastings Rashdall and G. E. Moore

Exponential anisotropy of solar cosmic rays

On 16 February 1984 a flare on the Sun's invisible disk produced a large, highly anisotropic solar particle event. A technique, in which interplanetary scattering parameters are determined purely from the form of the particle anisotropy, is applied to energetic particle data from neutron monitors and the ICE spacecraft

Transport of cross helicity and radial evolution of alfvenicity in the solar wind

A transport theory including cross helicity, magnetohydrodynamic(MHD) turbulence, and driving by shear and pickup ions, is applied to the radial evolution of the solar wind. The radial decrease of cross helicity observed in the solar wind can be accounted for when sufficient driving is included to overcome the inherent tendency for MHD turbulence to produce Alfvenic states

Gd(III)-Gd(III) Relaxation-Induced Dipolar Modulation Enhancement for In-Cell Electron Paramagnetic Resonance Distance Determination

In-cell distance determination by electron paramagnetic resonance (EPR) spectroscopy reveals essential structural information about biomacromolecules under native conditions. We demonstrate that the pulsed EPR technique RIDME (relaxation induced dipolar modulation enhancement) can be utilized for such distance determination. The performance of in-cell RIDME has been assessed at Q-band using stiff molecular rulers labeled with Gd(III)-PyMTA and microinjected into Xenopus laevis oocytes. The overtone coefficients are determined to be the same for protonated aqueous solutions and inside cells. As compared to in-cell DEER (double electron-electron resonance, also abbreviated as PELDOR), in-cell RIDME features approximately 5 times larger modulation depth and does not show artificial broadening in the distance distributions due to the effect of pseudosecular terms

Magnetic helicity in magnetohydrodynamic turbulence with a mean magnetic field

A computational investigation of magnetic helicity of the fluctuatingmagnetic fieldHm in ideal and freely decaying three‐dimensional (3‐D) magnetohydrodynamics (MHD) in the presence of a uniform mean magnetic field is performed. It is shown that for ideal 3‐D MHDHm, which is a rugged invariant in the absence of a mean magnetic field [Frisch et al., J. Fluid Mech. 77, 796 (1975)], decays from its initial value and proceeds to oscillate about zero. The decay of Hm is shown to result from the presence of a new ‘‘generalized’’ helicity invariant, which includes contributions from the uniform magnetic field. The loss of invariance of Hm will diminish the effects of inverse transfer of Hm on freely decaying turbulence. This is demonstrated in a discussion of the selective decay relaxation process

Radial evolution of cross helicity at low and high latitudes in the solar wind

We employ a turbulence transport theory to the radial evolution of the solar wind at both low and high latitudes. The theory includes cross helicity, magnetohydrodynamic (MHD) turbulence, and driving by shear and pickup ions. The radial decrease of cross helicity, observed in both low and high latitudes, can be accounted for by including sufficient shear driving to overcome the tendency of MHD turbulence to produce Alfvénic states. The shear driving is weaker at high latitudes leading to a slower evolution. Model results are compared with observations from Ulysses and Voyager

Radial evolution of cross helicity in high-latitude solar wind

We employ a turbulence transport theory to explain the high-latitude radial evolution of cross helicity, or Alfvénicity, observed by the Ulysses spacecraft. Evolution is slower than at low latitudes due to weakened shear driving