Results 51 to 60 of about 6,025 (156)

Characterizing the Signals and Backgrounds in a Low Earth Orbiting Cherenkov Detector, and Background Mitigation Strategies

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Cherenkov detectors have been used in space for decades to measure Galactic Cosmic Rays (GCRs), Solar Energetic Particles (SEPs) and trapped particles. We present proof‐of‐concept GRAS/Geant4 simulations to both show that a cubic fused silica Cherenkov detector with SiPM in LEO has a good sensitivity to SEP and GCR protons as a function of cut‐
C. S. W. Davis, F. Lei, K. Ryden, C. Dyer, G. Santin, P. Jiggens, M. Heil   +6 more
wiley   +1 more source

Investigation of Interstellar Scintillation of the Millisecond Pulsar B1937+21 with the FAST

The Astrophysical Journal
Pulsar scintillation serves as a valuable tool for investigating interstellar scattering screens and their properties. In this paper, we report on multiepoch interstellar scintillation from the millisecond pulsar B1937+21 (J1939+2134) using Five-hundred ...
Zhigang Wen, Hui Wang, Zhen Wang, Jianping Yuan, Na Wang, Wenming yan, Wei Han, Xuefeng Duan, Honguang Wang, Pengcheng He, Jianling Chen, Chengbing Lyu   +11 more
doaj   +1 more source

Plasma Turbulence in the Local Bubble

, 2008
Turbulence in the Local Bubble could play an important role in the thermodynamics of the gas that is there. The best astronomical technique for measuring turbulence in astrophysical plasmas is radio scintillation.
A. Barnes, A.H. Minter, B.D.G. Chandran, B.J. Rickett, B.J. Rickett, D.P. Cox, F.S. Trang, J.A. Phillips, J.H. Taylor, J.L. Linsky, J.M. Cordes, J.M. Cordes, M. Opher, M.A. Walker, N.D.R. Bhat, P.C. Frisch, R. Lallement, R.N. Manchester, S. Redfield, S.R. Spangler, S.R. Spangler, S.R. Spangler, S.R. Spangler, Steven R. Spangler, W.F. Brisken, W.F. Brisken   +25 more
core   +1 more source

Improving Pulsar Distances by Modelling Interstellar Scattering [PDF]

, 1998
We present here a method to study the distribution of electron density fluctuations in pulsar directions as well as to estimate pulsar distances. The method, based on a simple two-component model of the scattering medium discussed by Gwinn et al. (1993),
Deshpande, A. A., Ramachandran, R.
core   +4 more sources

The Constraint of Crewed Mars Missions Based on Current Radiation Dose Measurements

Space Weather, Volume 24, Issue 3, March 2026.
Abstract Crewed missions to Mars will be a milestone of future space exploration programs. However, the absence of Earth's magnetic field leaves astronauts directly exposed to unattenuated energetic particles in deep space, primarily galactic cosmic rays (GCRs), resulting in significantly higher radiation levels and enhanced health risks. Understanding
Chao Zhang, Weihao Liu, Jingnan Guo, Mikhail Dobynde, Robert F. Wimmer‐Schweingruber   +4 more
wiley   +1 more source

Relevance of Murchison Widefield Array Interplanetary Scintillation Observations to Heliospheric Transient Catalogs

Space Weather, Volume 23, Issue 12, December 2025.
Abstract We have conducted a comprehensive comparison of interplanetary scintillation (IPS) observations taken by the Murchison Widefield Array (MWA) with several heliospheric transient event catalogs, over a time period of 7 months during solar minimum.
A. Waszewski, J. S. Morgan, M. C. M. Cheung, R. Ekers, E. Samara, S. Majumdar, R. Chhetri, N. D. R. Bhat, M. Johnston‐Hollitt   +8 more
wiley   +1 more source

Pulsar Scintillation and Interstellar Lenses

, 2023
The radio emission of pulsars is scattered within the interstellar medium due to variations of the electron column density. Pulsars are very compact sources of pulsed radiation and, thus, emit spatially coherent radiation leading to observable interference of scattered paths. The corresponding amplitude variations are called scintillation.
openaire   +3 more sources

Theory of Parabolic Arcs in Interstellar Scintillation Spectra

, 2004
Our theory relates the secondary spectrum, the 2D power spectrum of the radio dynamic spectrum, to the scattered pulsar image in a thin scattering screen geometry.
Barney J. Rickett, Chashei I. V., Codona J. L., Coles Wm. A., Daniel R. Stinebring, Goodman J., Hewish A., James M. Cordes, Narayan R., Rickett B. J., Roberts J. A., Wilkinson P. N., William A. Coles   +12 more
core   +1 more source

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

A Cyclic Spectroscopy Scintillation Study of PSR B1937+21. I. Demonstration of Improved Scintillometry

The Astrophysical Journal
We use cyclic spectroscopy to perform high-frequency resolution analyses of multihour baseband Arecibo observations of the millisecond pulsar PSR B1937+21.
Jacob E. Turner, Timothy Dolch, James M. Cordes, Stella K. Ocker, Daniel R. Stinebring, Shami Chatterjee, Maura A. McLaughlin, Victoria E. Catlett, Cody Jessup, Nathaniel Jones, Christopher Scheithauer   +10 more
doaj   +1 more source