Results 21 to 30 of about 4,001,813 (277)

Capabilities of ARIANNA: Neutrino Pointing Resolution and Implications for Future Ultra-high Energy Neutrino Astronomy

International Conference on Rebooting Computing, 2021
A radio-frequency polarization measurement by the ARIANNA surface station was performed using a residual hole from the South Pole Ice Core (SPICEcore) Project.
S. Barwick, A. Anker, P. Baldi, S. Barwick, J. Beise, Hans Bernhoff, D. Besson, N. Bingefors, M. Cataldo, Pisin Chen, D. Fernández, G. Gaswint, C. Glaser, A. Hallgren, S. Hallmann, J. Hanson, S. Klein, S. Kleinfelder, R. Lahmann, Jiayi Liu, M. Magnuson, S. McAleer, Z. Meyers, J. Nam, A. Nelles, A. Novikov, M. P. Paul, C. Persichilli, I. Plaisier, L. Pyras, R. Rice-Smith, J. Tatar, Shih-Hao Wang, C. Welling, Leshan Zhao, Arianna   +35 more
semanticscholar   +1 more source

New Measurement of the Vertical Atmospheric Density Profile From Occultations of the Crab Nebula With X‐Ray Astronomy Satellites Suzaku and Hitomi [PDF]

Journal of Geophysical Research: Space Physics, 2020
We present new measurements of the vertical density profile of the Earth's atmosphere at altitudes between 70 and 200 km, based on Earth occultations of the Crab Nebula observed with the X‐ray Imaging Spectrometer onboard Suzaku and the hard X‐ray Imager
S. Katsuda, H. Fujiwara, Y. Ishisaki, Maeda Yoshitomo, K. Mori, Y. Motizuki, Kosuke Sato, M. Tashiro, Y. Terada   +8 more
semanticscholar   +1 more source

Characteristics of Horizontal Winds in the Mesosphere and Lower Thermosphere Region over Korean Peninsula Observed from the Korea Astronomy and Space Science Institute Meteor Radar

Journal of Astronomy & Space Sciences, 2021
We present for the first time the characteristics of upper atmospheric horizontal winds over the Korean Peninsula. Winds and their variability are derived using four-year measurements by the Korea Astronomy and Space Science Institute (KASI) meteor ...
H. Kam, Y. Kwak, Taeyong Yang, Y. Kim, Jeongheon Kim, Jaewook Lee, Seonghwan Choi, J. Baek   +7 more
semanticscholar   +1 more source

Babylonian Shadow-Length Schemes: Between Mathematics and Astronomy

Claroscuro. Revista del Centro de Estudios sobre Diversidad Cultural, 2021
A simple mathematical scheme to represent the variation in the length of the shadow cast by a vertical gnomon at different times of day and in different months of the year is presented in the early astronomical compendium MUL.APIN.
J. Steele
semanticscholar   +1 more source

Inelastic O+H collisions and the O I 777 nm solar centre-to-limb variation [PDF]

Astronomy & Astrophysics, 2018
The O I 777 nm triplet is a key diagnostic of oxygen abundances in the atmospheres of FGK-type stars; however, it is sensitive to departures from local thermodynamic equilibrium (LTE). The accuracy of non-LTE line formation calculations has hitherto been
A. Amarsi, P. Barklem, M. Asplund, R. Collet, O. Zatsarinny   +4 more
semanticscholar   +1 more source

Height variation of the cutoff frequency in a sunspot umbra [PDF]

Astronomy & Astrophysics, 2018
Context. In the solar atmosphere, the acoustic cutoff frequency is a local quantity that depends on atmospheric height. It separates low-frequency evanescent waves from high-frequency propagating waves. Aims.
T. Felipe, C. Kuckein, I. Thaler
semanticscholar   +1 more source

Activity induced variation in spin-orbit angles as derived from Rossiter–McLaughlin measurements [PDF]

Astronomy & Astrophysics, 2018
One of the most powerful methods used to estimate sky-projected spin-orbit angles of exoplanetary systems is through a spectroscopic transit observation known as the RossiterMcLaughlin (RM) effect.
M. Oshagh, A. Triaud, A. Burdanov, P. Figueira, A. Reiners, Nuno C. Santos, J. Faria, G. Boué, R. Díaz, S. Dreizler, S. Boldt, L. Delrez, E. Ducrot, M. Gillon, A. G. Mesa, E. Jehin, S. Khalafinejad, S. Kohl, L. Serrano, S. Udry   +19 more
semanticscholar   +1 more source

Rotational variation of the linear polarization of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties★ [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2018
This work was supported via a grant (ST/M000834/1) from the UK Science and Technology Facilities Council. We gratefully acknowledge observing grant support from the Institute of Astronomy and Rozhen National Astronomical Observatory, Bulgarian Academy of
G. Borisov, M. Devogèle, A. Cellino, S. Bagnulo, A. Christou, P. Bendjoya, J. Rivet, L. Abe, D. Vernet, Z. Donchev, Y. Krugly, I. Belskaya, T. Bonev, D. Steeghs, D. Galloway, V. Dhillon, P. O’Brien, D. Pollacco, S. Poshyachinda, G. Ramsay, E. Thrane, K. Ackley, E. Rol, K. Ulaczyk, Ry Cutter, M. Dyer   +25 more
semanticscholar   +1 more source

Conceptual Design of the NISS onboard NEXTSat-1 [PDF]

Journal of Astronomy and Space Sciences, 2014
The NISS onboard NEXTSat-1 is being developed by Korea astronomy and space science institute (KASI). For the study of the cosmic star formation history, the NISS performs the imaging spectroscopic observation in the near-infrared range for nearby ...
Woong-Seob Jeong, Sung-Joon Park, Kwijong Park, Dae-Hee Lee, Jeonghyun Pyo, Bongkon Moon, Youngsik Park, Il-Joong Kim, Won-Kee Park, Duk-Hang Lee, Chan Park, Kyeongyeon Ko, Toshio Matsumoto, Norihide Takeyama, Akito Enokuchi, Goo-Whan Shin, Jangsoo Chae, Uk-Won Nam   +17 more
doaj   +1 more source

Total-variation methods for gravitational-wave denoising: Performance tests on Advanced LIGO data [PDF]

Physical Review D, 2018
We assess total-variation methods to denoise gravitational-wave signals in real noise conditions by injecting numerical-relativity waveforms from core-collapse supernovae and binary black hole mergers in data from the first observing run of Advanced LIGO.
A. Torres-Forn'e, E. Cuoco, A. Marquina, J. Font, J. Ib'anez   +4 more
semanticscholar   +1 more source