Revisiting two-step Forbush decreases

Interplanetary coronal mass ejections (ICMEs) and their shocks can sweep out galactic cosmic rays (GCRs), thus creating Forbush decreases (FDs). The traditional model of FDs predicts that an ICME and its shock decrease the GCR intensity in a two-step profile. This model, however, has been the focus of little testing. Thus, our goal is to discover whether a passing ICME and its shock inevitably lead to a two-step FD, as predicted by the model. We use cosmic ray data from 14 neutron monitors and, when possible, high time resolution GCR data from the spacecraft International Gamma Ray Astrophysical Laboratory (INTEGRAL). We analyze 233 ICMEs that should have created two-step FDs. Of these, only 80 created FDs, and only 13 created two-step FDs. FDs are thus less common than predicted by the model. The majority of events indicates that profiles of FDs are more complicated, particularly within the ICME sheath, than predicted by the model. We conclude that the traditional model of FDs as having one or two steps should be discarded. We also conclude that generally ignored small-scale interplanetary magnetic field structure can contribute to the observed variety of FD profiles

The Medical Malpractice Reform Act of 1975: The Unanswered Issues of \u3cem\u3eCarter v. Sparkman\u3c/em\u3e

In the wake of rising criticism of Florida\u27s Medical Malpractice Reform Act of 1975, the authors examine several constitutional issues which were not addressed by the supreme court in its validation of the Act in Carter v. Sparkman. The Act is criticized as constitutionally deficient on equal protection and substantive and procedural due process grounds. In their appeal for reform, the authors present several salient insights into the burdens placed on medical malpractice claimants under the present Act

The Medical Malpractice Reform Act of 1975: The Unanswered Issues of \u3cem\u3eCarter v. Sparkman\u3c/em\u3e

In the wake of rising criticism of Florida\u27s Medical Malpractice Reform Act of 1975, the authors examine several constitutional issues which were not addressed by the supreme court in its validation of the Act in Carter v. Sparkman. The Act is criticized as constitutionally deficient on equal protection and substantive and procedural due process grounds. In their appeal for reform, the authors present several salient insights into the burdens placed on medical malpractice claimants under the present Act

The discovery of trapped energetic electrons in the outer cusp

We report on the POLAR/CEPPAD discovery of a trapped, 60°\u3cθ\u3c120° pitch angle electron population in the outer cusp (7−9+ Re), whose energetic electron component extends from below 30 keV to ∼2 MeV. Because the time variability in the outer cusp precludes mapping with POLAR, we have carried out test particle simulations using the Tsyganenko 1996 model (T96) to demonstrate the trapping of these energy electrons in the outer cusp region and the resonant frequencies of its trapped motion. We discuss the boundaries and regions of the cusp trap and show that it is analogous to the dipole trap. We show that the phase space densities observed there are equal or greater than the phase space densities observed in the radiation belts at constant magnetic moment, thus allowing the possibility of diffusive filling of the radiation belts from the cus

Performing research: four contributions to HCI

This paper identifies a body of HCI research wherein the researchers take part in digitally mediated creative experiences alongside participants. We present our definition and rationale for "self-situated performance research" based on theories in both the HCI and performance literatures. We then analyse four case studies of this type of work, ranging from overtly "performative" staged events to locative audio and public making. We argue that by interrogating experience from within the context of self-situated performance, the 'performer/researcher' extends traditional practices in HCI in the following four ways: developing an intimate relationship between researchers and participants, providing new means of making sense of interactions, shaping participants' relationship to the research, and enabling researchers to refine their work as it is being conducted

First energetic neutral atom images from Polar

Energetic neutral atoms are created when energetic magnetospheric ions undergo charge exchange with cold neutral atoms in the Earth\u27s tenuous extended atmosphere (the geocorona). Since they are unaffected by the Earth\u27s magnetic field, these energetic neutrals travel away in straight line trajectories from the points of charge exchange. The remote detection of these particles provides a powerful means through which the global distribution and properties of the geocorona and ring current can be inferred. Due to its 2 × 9 RE polar orbit, the Polar spacecraft provides an excellent platform from which to observe ENAs because it spends much of its time in the polar caps which are usually free from the contaminating energetic charged particles that make observations of ENAs more difficult. In this brief report, we present the first ENA imaging results from Polar. Storm-time ENA images are presented for a northern polar cap apogee pass on August 29, 1996 and for a southern polar cap perigee pass on October 23, 1996. As well, we show with a third event (July 31, 1996) that ENA emissions can also be detected in association with individual substorm