Results 41 to 50 of about 41,615 (50)

First Detections of Ionospheric Plasma Density Irregularities from GOES Geostationary GPS Observations during Geomagnetic Storms

Atmosphere
In this study, we present the first results of detecting ionospheric irregularities using non-typical GPS observations recorded onboard the Geostationary Operational Environmental Satellites (GOES) mission operating at ~35,800 km altitude.
Iurii Cherniak, Irina Zakharenkova, Scott Gleason, Douglas Hunt   +3 more
doaj   +1 more source

Publisher Correction: Measuring the ionisation fraction in a jet from a massive protostar

Nature Communications, 2019
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
R. Fedriani, A. Caratti o Garatti, S. J. D. Purser, A. Sanna, J. C. Tan, R. Garcia-Lopez, T. P. Ray, D. Coffey, B. Stecklum, M. Hoare   +9 more
doaj   +1 more source

Measuring the ionisation fraction in a jet from a massive protostar

Nature Communications, 2019
The ionisation fraction of protostellar jets is key to establish their true energetics. Here, the authors determine it in a jet from a high-mass young stellar object, using multi-wavelengths observations, confirming that the ionising mechanism giving ...
R. Fedriani, A. Caratti o Garatti, S. J. D. Purser, A. Sanna, J. C. Tan, R. Garcia-Lopez, T. P. Ray, D. Coffey, B. Stecklum, M. Hoare   +9 more
doaj   +1 more source

When Plasma Streams Tie up Equatorial Plasma Irregularities with Auroral Ones

Space Weather, 2020
We present a new pattern of storm‐induced ionospheric irregularities behavior at midlatitudes—poleward‐streaming plasma density depletions. Under disturbed conditions, they appear at North America low latitudes as a part of extended postsunset equatorial
Irina Zakharenkova, Iurii Cherniak
doaj   +1 more source

Quantitative Constraint on the Contribution of Resolved Gamma-Ray Sources to the Sub-PeV Galactic Diffuse Gamma-Ray Flux Measured by the Tibet ASγ Experiment

The Astrophysical Journal Letters
Motivated by the difference between the fluxes of sub-PeV Galactic diffuse gamma-ray emission (GDE) measured by the Tibet AS γ experiment and the LHAASO collaboration, our study constrains the contribution to the GDE flux measured by Tibet AS γ from the ...
S. Kato, M. Anzorena, D. Chen, K. Fujita, R. Garcia, J. Huang, G. Imaizumi, T. Kawashima, K. Kawata, A. Mizuno, M. Ohnishi, T. Sako, T. K. Sako, F. Sugimoto, M. Takita, Y. Yokoe   +15 more
doaj   +1 more source

An Assessment of the GLE Alert++ Warning System

Atmosphere
Over the last years the Athens Cosmic Ray Group of the National & Kapodistrian University of Athens has implemented a warning tool called GLE Alert, which is a highly credible application that issues alerts when a ground level enhancement (GLE) starts ...
Helen Mavromichalaki, Pavlos Paschalis, Maria Gerontidou, Anastasia Tezari, Maria-Christina Papailiou, Dimitra Lingri, Maria Livada, Argyris Stassinakis, Norma Crosby, Mark Dierckxsens   +9 more
doaj   +1 more source

Tibetan and Indian lithospheres in the upper mantle beneath Tibet: Evidence from broadband surface‐wave dispersion

Geochemistry, Geophysics, Geosystems, 2013
Broadband seismic experiments over the last two decades have produced dense data coverage across Tibet. Yet, the mechanism of the India‐Asia lithospheric convergence beneath it remains a puzzle, with even its basic features debated and with very ...
Matthew R. Agius, Sergei Lebedev
doaj   +1 more source

Revisiting metastable cosmic string breaking

Journal of High Energy Physics
Metastable cosmic strings appear in models of new physics with a two-step symmetry breaking G → H → 1, where π 1(H) ≠ 0 and π 1(G) = 0. They decay via the monopole-antimonopole pair creation inside. Conventionally, the breaking rate has been estimated by
Akifumi Chitose, Masahiro Ibe, Yuhei Nakayama, Satoshi Shirai, Keiichi Watanabe   +4 more
doaj   +1 more source

Geomagnetic and Cosmic Ray Activity Effect on Heart Rate during the Solar Cycle 24

Atmosphere
The number of investigations relevant to the study of geomagnetic activity, solar events, and cosmic rays, i.e., space weather phenomena, and their impact on human health has increased dramatically over the past few years.
Maria-Christina Papailiou, Sofia Ioannidou, Anastasia Tezari, Helen Mavromichalaki   +3 more
doaj   +1 more source

On the Source Contribution to the Galactic Diffuse Gamma Rays above 398 TeV Detected by the Tibet ASγ Experiment

The Astrophysical Journal Letters
Potential contribution from gamma-ray sources to the Galactic diffuse gamma rays observed above 100 TeV (sub-PeV energy range) by the Tibet AS γ experiment is an important key to interpreting recent multimessenger observations.
S. Kato, D. Chen, J. Huang, T. Kawashima, K. Kawata, A. Mizuno, M. Ohnishi, T. Sako, T. K. Sako, M. Takita, Y. Yokoe   +10 more
doaj   +1 more source