Interplanetary stream magnetism: Kinematic effects

The particle density, and the magnetic field intensity and direction are calculated in corotating streams of the solar wind, assuming that the solar wind velocity is constant and radial and that its azimuthal variations are not two rapid. The effects of the radial velocity profile in corotating streams on the magnetic fields were examined using kinematic approximation and a variety of field configurations on the inner boundary. Kinematic and dynamic effects are discussed

Interplanetary magnetic fields, their fluctuations, and cosmic ray variations

The cause of Forbush decreases is examined using neutron monitor data and measurements of the interplanetary magnetic field. It is found that for the period examined (Dec. 15, 1965 to April 23, 1966) large enhancements of the interplanetary magnetic field correlate well with decreases in cosmic ray intensity, while various parameters connected with the fluctuations in the field do not display such good correlation. The inference is drawn that Forbush decreases are not related to the turbulence or random motions in the field but to the large scale features of the field

Causes of forbush decreases and other cosmic ray variations

The relationship between neutron monitor variations and the intensity variations of the interplanetary magnetic field is studied, using Deep River data and IMP-series satellite data. In over 80% of the cases studied, identifiable depressions of the cosmic ray intensity are associated with magnetic field enhancements of several hours duration and intensity above 10 gamma. Conversely, each magnetic field enhancement has an identifiable effect (though not necessarily a marked depression) on the cosmic ray intensity. Long lasting Forbush decreases are found to be the consequence of the successive action of several such features. An explanation is presented and discussed

Quantum Groups, Correlation Functions and Infrared Divergences

We show in two simple examples that for one-dimensional quantum chains with quantum group symmetries, the correlation functions of local operators are, in general, infrared divergent. If one considers, however, correlation functions invariant under the quantum group, the divergences cancel out.Comment: 7 pages, BONN-HE-93-0

A Policy Discourse Analysis of Academic Probation

In this policy discourse analysis study, I explored the discourse of academic-probation policies for undergraduate students in Dominican higher education institutions. Policies from twelve universities described strategies of power throughout. Academic-probation policies were characterized by their brevity and focus on disciplinary actions for students who did not meet the established academic standards. Key implications are related to issues of student marginalization in higher education institutions. Future policy revisions should address the punitive measures and the implications of being classified below “normal” and should refocus on institutional retention as a policy.   Keywords: Academic Probation, Higher Education, Policy   Dans cette étude portant sur l’analyse du discours en matière de politiques, je me penche sur le discours des politiques portant sur la probation académique des étudiants du premier cycle dans certains établissements d’études supérieures en République dominicaine. On retrouve, tout au long du texte des politiques des douze universités étudiées, des descriptions de stratégies de pouvoir. Les politiques portant sur la probation académique se caractérisaient par leur brièveté et leur accent sur les actions disciplinaires visant les étudiants qui n’atteignaient pas les normes académiques établies. Les implications principales touchent la marginalisation des étudiants inscrits dans des établissements d’études supérieures. À l’avenir, les révisions des politiques devraient aborder les mesures punitives et les implications d’être classés sous la norme pour se recentrer sur la rétention institutionnelle.   Mots clés : probation académique; études supérieures; politiqu