Results 61 to 70 of about 39,482 (251)

Elastic Properties of Returned Samples From Asteroid (162173) Ryugu

Journal of Geophysical Research: Planets, Volume 130, Issue 10, October 2025.
Abstract The successful sample return from asteroid (162173) Ryugu by Hayabusa2 has contributed to our understanding of the solar system evolution. Over the course of the initial sample analysis, various measurements were conducted, such as mineralogical observation, chemical analysis, and mechanical property measurement.
Keisuke Onodera, Yuta Ino, Satoshi Tanaka, Taichi Kawamura, Takuya Ishizaki, Rei Kanemaru, Ryota Fukai, Takeshi Tsuji, Tomoki Nakamura, Daisuke Nakashima, Masayuki Uesugi, Shogo Tachibana, Seiji Sugita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Masanao Abe, Tatsuaki Okada, Tomohiro Usui, Makoto Yoshikawa, Takanao Saiki, Fuyuto Terui, Satoru Nakazawa, Sei‐ichiro Watanabe, Yuichi Tsuda   +32 more
wiley   +1 more source

Investigation of Phase Shift and Travel Time of Acoustic Waves in the Lower Solar Atmosphere Using Multiheight Velocities

The Astrophysical Journal
We report and discuss the phase shift and phase travel time of low-frequency ( ν < 5.0 mHz) acoustic waves estimated within the photosphere and photosphere–chromosphere interface regions, utilizing multiheight velocities in the quiet Sun.
Hirdesh Kumar, Brajesh Kumar, Shibu K. Mathew, A. Raja Bayanna, S. P. Rajaguru   +4 more
doaj   +1 more source

Quantifying Poynting Flux in the Quiet Sun Photosphere

The Astrophysical Journal, 2023
Poynting flux is the flux of magnetic energy, which is responsible for chromospheric and coronal heating in the solar atmosphere. It is defined as a cross product of the electric and magnetic fields, and in ideal MHD conditions it can be expressed in ...
Dennis Tilipman, Maria Kazachenko, Benoit Tremblay, Ivan Milić, Valentin Martínez Pillet, Matthias Rempel   +5 more
doaj   +1 more source

THE SUN’S PHOTOSPHERIC CONVECTION SPECTRUM [PDF]

The Astrophysical Journal, 2015
Spectra of the cellular photospheric flows are determined from full-disk Doppler velocity observations acquired by the Helioseismic and Magnetic Imager (HMI) instrument on the Solar Dynamics Observatory (SDO) spacecraft. Three different analysis methods are used to separately determine spectral coefficients representing the poloidal flows, the toroidal
David H. Hathaway, Thibaud Teil, Aimee A. Norton, Irina Kitiashvili   +3 more
openaire   +2 more sources

Using Solar Wind Data Assimilation Results to Drive Dynamic Solar Wind Models

Space Weather, Volume 23, Issue 9, September 2025.
Abstract A coupled modeling framework is often used to forecast the near‐Earth solar wind conditions. This consists of a coronal model for close to the Sun and a heliospheric model for propagating the solar wind out to Earth. The coronal model is initialized using photospheric magnetic field observations and beyond this, there are no further ...
Harriet Turner, Mathew Owens, Luke Barnard, Matthew Lang, Edmund Henley, François‐Xavier Bocquet, Siegfried Gonzi, C. Nick Arge, Rhiannon Biddiscombe, Tinatin Baratashvili   +9 more
wiley   +1 more source

Numerical Experiments on the Two-step Emergence of Twisted Magnetic Flux Tubes in the Sun

, 2011
We present the new results of the two-dimensional numerical experiments on the cross-sectional evolution of a twisted magnetic flux tube rising from the deeper solar convection zone (-20,000 km) to the corona through the surface. The initial depth is ten
Abbett, Cheung, D'Silva, Dorch, Emonet, Fan, Fan, Galsgaard, Magara, Manchester, Matsumoto, Moreno-Insertis, Moreno-Insertis, Parker, S. Toriumi, Schüssler, Spruit, T. Yokoyama, Toriumi, Toriumi   +19 more
core   +1 more source

Photospheric Response to a Flare [PDF]

The Astrophysical Journal, 2018
Abstract Flares produce sudden and permanent changes in the horizontal photospheric magnetic field. In particular, flares generally produce increased magnetic shear in the photospheric field along the neutral line. Recent observations also show that flares can produce sudden photospheric motion.
Michael S. Wheatland, Donald B. Melrose, Alpha Mastrano   +2 more
openaire   +2 more sources

Deriving the Coronal Separatrix‐Web With the WSA Model

Journal of Geophysical Research: Space Physics, Volume 130, Issue 8, August 2025.
Abstract We demonstrate a new capability of the Wang‐Sheeley‐Arge (WSA) model to routinely derive the coronal separatrix web (S‐web) as a standard data product. We describe our methodology for deriving the squashing factor (Q $Q$) and we use Carrington rotation (CR) 2109 to illustrate the validation of our output with that derived from the POT3D model.
Samantha Wallace, Aleida K. Higginson, David G. Simpson, Nicholeen M. Viall, Peter Wyper, C. Nick Arge   +5 more
wiley   +1 more source

Model-dependent high-energy neutrino flux from Gamma-Ray Bursts

, 2013
The IceCube Collaboration recently reported a stringent upper limit on the high energy neutrino flux from GRBs, which provides a meaningful constraint on the standard internal shock model.
Kumar, Pawan, Zhang, Bing
core   +1 more source

A High-resolution, Inversion-based Synoptic Study of Solar Granulation

The Astrophysical Journal
The convectively driven, weakly magnetized regions of the solar photosphere dominate the Sun’s surface at any given time, but the temporal variations of these quiet regions of the photosphere throughout the solar cycle are still not well known.
James W. Crowley, Ivan Milić, Gianna Cauzzi, Kevin Reardon   +3 more
doaj   +1 more source