Search Results - "SMART, D. F"

GLE and Sub-GLE Redefinition in the Light of High-Altitude Polar Neutron Monitors by Poluianov, S. V., Usoskin, I. G., Mishev, A. L., Shea, M. A., Smart, D. F.

“…The conventional definition of ground-level enhancement (GLE) events requires a detection of solar energetic particles (SEP) by at least two differently…”
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Space Weather and the Ground-Level Solar Proton Events of the 23rd Solar Cycle by Shea, M. A., Smart, D. F.

“…Solar proton events can adversely affect space and ground-based systems. Ground-level events are a subset of solar proton events that have a harder spectrum…”
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Solar Cycle in the Heliosphere and Cosmic Rays by Bazilevskaya, Galina A., Cliver, Edward W., Kovaltsov, Gennady A., Ling, Alan G., Shea, M. A., Smart, D. F., Usoskin, Ilya G.

“…Manifestations of the 11-year solar cycle and longer time-scale variability in the heliosphere and cosmic rays are considered. We briefly review the cyclic…”
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Solar cosmic ray events for the period 1561-1994: 1. Identification in polar ice, 1561-1950 by McCracken, K. G., Dreschhoff, G. A. M., Zeller, E. J., Smart, D. F., Shea, M. A.

“…The geophysical significance of the thin nitrate‐rich layers that have been found in both Arctic and Antarctic firn and ice cores, dating from the period…”
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Characteristics of Late-phase >100 MeV Gamma-Ray Emission in Solar Eruptive Events by Share, G. H., Murphy, R. J., White, S. M., Tolbert, A. K., Dennis, B. R., Schwartz, R. A., Smart, D. F., Shea, M. A.

“…We characterize and catalog 30 solar eruptive events observed by the Fermi Large Area Telescope (LAT) having late-phase >100 MeV γ-ray emission (LPGRE),…”
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Characteristics of Late-phase >100MeV Gamma-Ray Emission in Solar Eruptive Events by Share, G H, Murphy, R J, White, S M, Tolbert, A K, Dennis, B R, Schwartz, R A, Smart, D F, Shea, M A

“…We characterize and catalog 30 solar eruptive events observed by the Fermi Large Area Telescope (LAT) having late-phase >100 MeV γ-ray emission (LPGRE),…”
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Interhemispheric observations of impulsive nitrate enhancements associated with the four large ground-level solar cosmic ray events (1940–1950) by Kepko, L., Spence, H., Smart, D.F., Shea, M.A.

“…We present a compelling similarity of impulsive nitrate enhancements observed in polar ice from the northern and southern hemispheres. This analysis…”
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Solar cosmic ray events for the period 1561-1994: 2. The Gleissberg periodicity by McCracken, K. G., Dreschhoff, G. A. M., Smart, D. F., Shea, M. A.

“…A total of 125 large fluence solar proton events identified from the nitrate deposition in ice core from Greenland for the period 1561–1950 are examined in an…”
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Magnetospheric Models and Trajectory Computations by Smart, D F, Shea, MA, Flueckiger, E O

“…The calculation of particle trajectories in the Earth's magnetic field has been a subject of interest since the time of Störmer. The fundamental problem is…”
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Scaling time-integrated in situ cosmogenic nuclide production rates using a continuous geomagnetic model by Lifton, Nathaniel, Smart, D.F., Shea, M.A.

“…Spatial and temporal variations in Earth's magnetic field affect the corresponding time-integrated distribution of in situ cosmogenic nuclide (CN) production…”
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Fifty Years of Cosmic Radiation Data by Shea, MA, Smart, D F

“…Cosmic radiation has been measured by a variety of techniques since 1933. This paper presents the evolution of data acquisition, processing, and availability…”
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Low time resolution analysis of polar ice cores cannot detect impulsive nitrate events by Smart, D. F., Shea, M. A., Melott, A. L., Laird, C. M.

“…Ice cores are archives of climate change and possibly large solar proton events (SPEs). Wolff et al. (2012) used a single event, a nitrate peak in the GISP2‐H…”
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A Study of the Frequency of Occurrence of Large-Fluence Solar Proton Events and the Strength of the Interplanetary Magnetic Field by Mccracken, K G, Dreschhoff, GAM, Smart, D F, Shea, MA

“…Issue Title: Topical Issue: Space Climate: Direct and Indirect Observations of Long-term Solar Activity It has been shown previously that the number of…”
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Reply to comment by E. W. Wolff et al. on “Low time resolution analysis of polar ice cores cannot detect impulsive nitrate events” by Smart, D. F., Shea, M. A., Melott, A. L., Laird, C. M.

“…Wolff et al. (2016) comment on Smart et al. (2014) and in doing so concentrate on issues other than the main point. They do not dispute our central assertion,…”
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Fifty years of progress in geomagnetic cutoff rigidity determinations by Smart, D.F., Shea, M.A.

“…This paper is a review of the progress made in geomagnetic cutoff rigidity calculations over the past 50 years. Determinations of cosmic ray trajectories, and…”
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Cosmic ray Implications for Human Health by Shea, MA, Smart, D F

“…There appears to be concern among some people about the possible effects of cosmic radiation on everyday life. The amount of cosmic radiation that reaches the…”
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The October 22, 1989, solar cosmic ray enhancement: An analysis of the anisotropy and spectral characteristics by Cramp, J. L., Duldig, M. L., Flückiger, E. O., Humble, J. E., Shea, M. A., Smart, D. F.

“…A solar cosmic ray ground‐level enhancement was observed at Earth on October 22, 1989, with an extremely anisotropic onset. On the basis of neutron monitor…”
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Solar particle enhancements of single-event effect rates at aircraft altitudes by Dyer, C.S., Lei, F., Clucas, S.N., Smart, D.F., Shea, M.A.

“…Data from space-borne detectors and ground-level neutron monitors, together with radiation transport codes, are applied to calculate the single-event effects…”
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The Use of Geophysical Data in Studies of the Historical Solar-Terrestrial Environment by Shea, MA, Smart, D F

“…Issue Title: Topical Issue: Space Climate: Direct and Indirect Observations of Long-term Solar Activity Recent studies of the solar-terrestrial environment for…”
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The space-developed dynamic vertical cutoff rigidity model and its applicability to aircraft radiation dose by Smart, D.F., Shea, M.A.

“…We have developed a dynamic geomagnetic vertical cutoff rigidity model that predicts the energetic charged particle transmission through the magnetosphere…”
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