Results 81 to 90 of about 1,965,723 (227)

SEASONAL VARIATIONS OF THE IONOSPHERE SCINTILLATIONS PARAMETERS OBTAINED FROM THE LONG OBSERVATIONS OF THE POWER COSMIC RADIO SOURCES AT THE DECAMETER WAVE RANGE

Odessa Astronomical Publications, 2016
Observations of the four power cosmic radio sources were carried out on the radio telescope (RT) URAN-4 during 1987-1990 and 1998-2007 at the frequencies 20 and 25 MHz.
O. A. Lytvynenko, S. K. Panishko
doaj   +1 more source

The Evolution of Autonomous Systems for Planetary Cave Exploration: A Review

Journal of Field Robotics, Volume 43, Issue 6, Page 4094-4115, September 2026.
ABSTRACT The exploration of Subsurface Access Points (SAPs), such as lava tubes on the Moon and Mars, has gained significant interest due to their potential as stable environments shielded from surface radiation and temperature extremes. These sites are considered high‐value targets for detecting water and signs of ancient life, and assessing their ...
Sarah Swinton, Daniel Mitchell, Jamie Blanche, Euan McGookin, David Flynn   +4 more
wiley   +1 more source

Searching for ultralight dark matter conversion in solar corona using Low Frequency Array data

Nature Communications
Ultralight dark photons and axions are well-motivated hypothetical dark matter candidates. Both dark photon dark matter and axion dark matter can resonantly convert into electromagnetic waves in the solar corona when their mass is equal to the solar ...
Haipeng An, Xingyao Chen, Shuailiang Ge, Jia Liu, Yan Luo   +4 more
doaj   +1 more source

Cosmic Ray Anisotropy Generated by the June 22nd 2015 Interplanetary Events

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract On 22 June 2015, the near Earth interplanetary space was perturbed by a series of high‐speed streamers and interplanetary coronal mass ejections associated with an active region and two low‐latitude coronal holes. The interaction of these disturbances gave rise to the complex solar wind structure observed at 1 au.
A. Lara, K. P. Arunbabu, T. Niembro
wiley   +1 more source

A Dynamic Auroral Ionospheric Density Profile Reveals a Planetary‐Scale Cavity at Jupiter

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Low‐altitude measurements above Jupiter's main auroras have shown the presence of persistent auroral density depletions. This low density regime strongly favors auroral acceleration by inertial Alfvén waves to explain the predominance of energetic (100–1,000 keV) broadband electron beams.
N. S. Kruegler, A. H. Sulaiman, S. S. Elliott   +2 more
wiley   +1 more source

Inferring Io's Internal Properties by Combining Gravity Measurements and Volcanic Activity

Journal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract With its extreme geological activity, Io represents an archetype for tidally heated exoplanets/moons and provides insight into early stages of terrestrial planet evolution. Decades of ground‐based observations and multiple space missions have refined our understanding of Io, yet it remains debated where inside Io the tidal heating takes place.
A. Veenstra, M. Rovira‐Navarro, W. van der Wal   +2 more
wiley   +1 more source

DECAMETER TYPE IV BURSTS, FIBER-BURSTS AND TYPE III BURSTS ASSOCIATED WITH GROUP OF SOLAR ACTIVE REGIONS

Radio Physics and Radio Astronomy, 2014
Features of sporadic decameter solar radio emission associated with some active regions according to observations made with radio telescope UTR-2 on August 1, 2014 are considered.
A. V. Antonov, V. N. Melnik, A. A. Konovalenko, V. V. Dorovskyy, H. O. Rucker, T. Zaqarashvili, A. A. Stanislavsky, A. A. Koval   +7 more
doaj   +1 more source

Solar radiation visibility testing algorithm for precise shadow distribution for spatial steel structural thermal analysis under sunlight

Case Studies in Thermal Engineering
As a large-span spatial steel structure, the radio telescope, characterized by its extensive span and numerous structural components, is sensitive to temperature gradients and susceptible to localized deformations induced by non-uniform temperature filed
Kai Zhang, Liyang Yu, Deshen Chen, Hongliang Qian   +3 more
doaj   +1 more source

HORIZONTAL SHORT MONOPOLE ANTENNA FOR RADIOSOLARIZ SOLAR RADIO TELESCOPE

Aerospace Research in Bulgaria
This paper elaborates on the possible implementation of a horizontally shortened monopole antenna in broadband radio reception of radio emissions originating from the Sun. The spectrum of interest is in the low portion of the very high frequency (VHF) radio band.
Svetoslav Zabunov, Garo Mardirossian
openaire   +1 more source

Doppler imaging of young solar-type stars using the ANU 2.3 m Siding Spring Telescope [PDF]

, 2013
The study of surface activity on young solar-type stars provides an opportunity to improve understanding of stellar dynamos and indirectly gain insight into early solar evolution.
Burton, Donna Marie
core   +1 more source