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Articles 1 - 10 of 10
Full-Text Articles in Physics
Revisiting Two-Step Forbush Decreases, Andrew P. Jordan, Harlan E. Spence, J. B. Blake, D. N. A. Shaul
Revisiting Two-Step Forbush Decreases, Andrew P. Jordan, Harlan E. Spence, J. B. Blake, D. N. A. Shaul
Physics & Astronomy
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). …
Cooper-Pair Insulator Phase In Superconducting Amorphous Bi Films Induced By Nanometer-Scale Thickness Variations, Shawna M. Hollen, H Q. Nguyen, E. Rudisaile, M D. Stewart Jr, J Shainline, J. M. Xu, J M. Valles
Cooper-Pair Insulator Phase In Superconducting Amorphous Bi Films Induced By Nanometer-Scale Thickness Variations, Shawna M. Hollen, H Q. Nguyen, E. Rudisaile, M D. Stewart Jr, J Shainline, J. M. Xu, J M. Valles
Physics & Astronomy
Ultrathin films near the quantum insulator-superconductor transition (IST) can exhibit Cooper-pair transport in their insulating state. This Cooper-pair insulator (CPI) state is achieved in amorphous Bi films evaporated onto substrates with a topography varying on lengths slightly greater than the superconducting coherence length. We present evidence that this topography induces film thickness and corresponding superconducting coupling constant variations that promote Cooper-pair island formation. Analyses of many thickness-tuned ISTs show that weak links between superconducting islands dominate the transport. In particular, the IST occurs when the link resistance approaches the resistance quantum for pairs. These results support conjectures that the CPI …
New Measurements Of Total Ionizing Dose In The Lunar Environment, J. E. Mazur, W. R. Crain, M. D. Looper, D. J. Mabry, J. B. Blake, A. W. Case, M. J. Golightly, J. C. Kasper, Harlan E. Spence
New Measurements Of Total Ionizing Dose In The Lunar Environment, J. E. Mazur, W. R. Crain, M. D. Looper, D. J. Mabry, J. B. Blake, A. W. Case, M. J. Golightly, J. C. Kasper, Harlan E. Spence
Physics & Astronomy
[1] We report new measurements of solar minimum ionizing radiation dose at the Moon onboard the Lunar Reconnaissance Orbiter (LRO) from June 2009 through May 2010. The Cosmic Ray Telescope for the Effects of Radiation (CRaTER) instrument on LRO houses a compact and highly precise microdosimeter whose design allows measurements of dose rates below 1 micro-Rad per second in silicon achieved with minimal resources (20 g, ∼250 milliwatts, and ∼3 bits/second). We envision the use of such a small yet accurate dosimeter in many future spaceflight applications where volume, mass, and power are highly constrained. As this was the first …
Neutral Atom Imaging Of The Magnetospheric Cusps, S. M. Petrinec, M. A. Dayeh, H. O. Funsten, S. A. Fuselier, David F. Heirtzler, P. Janzen, Harald A. Kucharek, D. J. Mccomas, Eberhard Moebius, T. E. Moore, D. B. Reisenfeld, Nathan A. Schwadron, K. J. Trattner, P. Wurz
Neutral Atom Imaging Of The Magnetospheric Cusps, S. M. Petrinec, M. A. Dayeh, H. O. Funsten, S. A. Fuselier, David F. Heirtzler, P. Janzen, Harald A. Kucharek, D. J. Mccomas, Eberhard Moebius, T. E. Moore, D. B. Reisenfeld, Nathan A. Schwadron, K. J. Trattner, P. Wurz
Physics & Astronomy
The magnetospheric cusps separate closed dayside magnetospheric field lines from open field lines of the magnetotail mantle and lobes. All magnetospheric field lines that map to the magnetopause also pass through the cusp regions. Thus whenever magnetic reconnection occurs at the magnetopause, magnetosheath plasma can enter one or both of the cusp regions and charge exchange with the geocorona. The resulting energetic neutral atoms (ENAs) resulting from this charge exchange process propagate away from the cusps and are observed remotely by the Interstellar Boundary Explorer (IBEX). The asymmetry of the ENA intensities between the northern and southern cusps are strongly …
Dr. Eberhard Möbius, Professor In The Department Of Physics, Jennifer Lee
Dr. Eberhard Möbius, Professor In The Department Of Physics, Jennifer Lee
Inquiry Journal 2011
No abstract provided.
Finding A Safe, Efficient Method Of Producing High Quality, Non-Corrosive Scanning Probe Tips For Scanning Tunneling Microscopes, Dan Foley
Inquiry Journal 2011
No abstract provided.
The Radial Evolution Of Solar Wind Speeds, S. L. Mcgregor, W. J. Hughes, C. N. Arge, D. Odstrcil, Nathan A. Schwadron
The Radial Evolution Of Solar Wind Speeds, S. L. Mcgregor, W. J. Hughes, C. N. Arge, D. Odstrcil, Nathan A. Schwadron
Physics & Astronomy
The WSA-ENLIL model predicts significant evolution of the solar wind speed. Along a flux tube the solar wind speed at 1.0 AU and beyond is found to be significantly altered from the solar wind speed in the outer corona at 0.1 AU, with most of the change occurring within a few tenths of an AU from the Sun. The evolution of the solar wind speed is most pronounced during solar minimum for solar wind with observed speeds at 1.0 AU between 400 and 500 km/s, while the fastest and slowest solar wind experiences little acceleration or deceleration. Solar wind ionic …
Cooper Pair Localization In A-Bi Thin Films Near The Superconductor-Insulator Transition, Shawna M. Hollen, H Q. Nguyen, E. Rudisaile, J Shainline, G. E. Fernandes, J M. Xu, J M. Valles Jr.
Cooper Pair Localization In A-Bi Thin Films Near The Superconductor-Insulator Transition, Shawna M. Hollen, H Q. Nguyen, E. Rudisaile, J Shainline, G. E. Fernandes, J M. Xu, J M. Valles Jr.
Physics & Astronomy
No abstract provided.
First Ibex Observations Of The Terrestrial Plasma Sheet And A Possible Disconnection Event, D. J. Mccomas, M. A. Dayeh, H. O. Funsten, S. A. Fuselier, J. Goldstein, J. M. Jahn, P. Janzen, D. G. Mitchell, S. M. Petrinec, D. B. Reisenfeld, Nathan A. Schwadron
First Ibex Observations Of The Terrestrial Plasma Sheet And A Possible Disconnection Event, D. J. Mccomas, M. A. Dayeh, H. O. Funsten, S. A. Fuselier, J. Goldstein, J. M. Jahn, P. Janzen, D. G. Mitchell, S. M. Petrinec, D. B. Reisenfeld, Nathan A. Schwadron
Physics & Astronomy
The Interstellar Boundary Explorer (IBEX) mission has recently provided the first all-sky maps of energetic neutral atoms (ENAs) emitted from the edge of the heliosphere as well as the first observations of ENAs from the Moon and from the magnetosheath stagnation region at the nose of the magnetosphere. This study provides the first IBEX images of the ENA emissions from the nightside magnetosphere and plasma sheet. We show images from two IBEX orbits: one that displays typical plasma sheet emissions, which correlate reasonably well with a model magnetic field, and a second that shows a significant intensification that may indicate …
Remote Observations Of Ion Temperatures In The Quiet Time Magnetosphere, A. M. Keesee, N. Buzulukova, J. Goldstein, D. J. Mccomas, E. E. Scime, Harlan E. Spence, M. C. Fok, K. Tallaksen
Remote Observations Of Ion Temperatures In The Quiet Time Magnetosphere, A. M. Keesee, N. Buzulukova, J. Goldstein, D. J. Mccomas, E. E. Scime, Harlan E. Spence, M. C. Fok, K. Tallaksen
Physics & Astronomy
[1] Ion temperature analysis of the first energetic neutral atom images of the quiet-time, extended magnetosphere provides evidence of multiple regions of ion heating. This study confirms the existence of a dawn-dusk asymmetry in ion temperature predicted for quiescent magnetospheric conditions by Spence and Kivelson (1993) and demonstrates that it is an inherent magnetospheric feature.