Results 51 to 60 of about 614 (179)

Nightside Auroral Arcs Near the Electron Isotropy Boundary: TRACERS–THEMIS–MetOp Observations

Geophysical Research Letters, Volume 53, Issue 21, 16 November 2026.
Abstract Particle precipitation is the ultimate driver of aurorae. Monoenergetic (∼keV) electrons accelerated above the ionosphere produce discrete auroral forms and are associated with field‐aligned currents that govern magnetosphere–ionosphere (MI) coupling.
S. R. Kamaletdinov, A. V. Artemyev, X.‐J. Zhang, J. S. Halekas, S. Henderson, V. Angelopoulos   +5 more
wiley   +1 more source

Carbon Processing Domains: Seasonal and Spatial Controls on Dissolved Organic Carbon in a Montane River

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 11, November 2026.
Abstract Lotic biogeochemical structure and function have been studied extensively, but rivers lack a functional classification system for assessing spatiotemporal variability in solute behavior. Dissolved organic carbon (DOC) is a basal resource for aquatic communities, is chemically complex, and has aquatic and terrestrial sources and sinks. DOC is a
F. L. Young, M. D. DeGrandpre, H. M. Valett, J. D’Andrilli, M. Peipoch, R. Payn   +5 more
wiley   +1 more source

A.E. Nordenski and the auroral oval

Eos, Transactions American Geophysical Union, 1982
In 1857, Adold Erik Nordenskiöld (1832–1901), a Finnish geographer and mineralogist, was forced to withdraw from his position at the University of Helsinki because of a conflict with the czarist officials in Finland. He then moved to Sweden, where he became one of the most celebrated explorers of his time.
Tuomo Nygrén, Johan Silén
openaire   +1 more source

Van Allen Probes Observations of a Fundamental Poloidal Wave in the Plasmasphere

Journal of Geophysical Research: Space Physics, Volume 131, Issue 11, November 2026.
Abstract All past spacecraft observations of fundamental poloidal Alfvén (P1) waves attributed to ion drift resonance have been made outside the plasmasphere. In this study, we present the first spacecraft observations of a plasmaspheric P1 wave driven by that resonance.
Kazue Takahashi, Tomotsugu Yamakawa, Matina Gkioulidou, D. G. Mitchell, Jerry W. Manweiler   +4 more
wiley   +1 more source

Mesoscale Ionospheric Irregularity Oval at High Latitudes Observed by Global GNSS Networks (2010–2024)

Journal of Astronomy and Space Sciences
This study investigates high-latitude ionospheric mesoscale irregularities associated with energetic particle precipitation and magnetosphere-ionosphere-thermosphere coupling processes within the auroral oval using ground-based Global Navigation ...
Shun-Rong Zhang, Anthea J. Coster, Philip J. Erickson, Larisa P. Goncharenko, Jing Liu   +4 more
doaj   +1 more source

The Behaviors of Ionospheric Scintillations Around Different Types of Nightside Auroral Boundaries Seen at the Chinese Yellow River Station, Svalbard

Frontiers in Astronomy and Space Sciences, 2018
Dynamical nightside auroral structures are often observed by the all sky imagers (ASI) at the Chinese Yellow River Station (CYRS) at Ny-Ålesund, Svalbard, located in the polar cap near poleward edge of the nightside auroral oval.
Shishir Priyadarshi, Qing-He Zhang, Yuzhang Ma, Zanyang Xing, Ze-Jun Hu, Guozhu Li   +5 more
doaj   +1 more source

On the occurrence and characteristics of intense low-altitude electric fields observed by Freja [PDF]

Annales Geophysicae, 1995
High-resolution measurements by the double probe electric field instrument on the Freja satellite are presented. The observations show that extremely intense (up to 1 V m–1) and fine-structured (<1 km) electric fields exist at auroral latitudes ...
G. Marklund, L. Blomberg, C.-G. Fälthammar, P.-A. Lindqvist, L. Eliasson   +4 more
doaj   +1 more source

Impact of the 1 April 2026 Artemis II Rocket Launch on the Upper Atmosphere: TIMED/GUVI Observations

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract The NASA Artemis II rocket was successfully launched at 06:35 p.m. ET (22:35 UTC) on 1 April 2026 from the Kennedy Space Center (28°35′28″N 80°39′03″W). The rocket plume caused enhanced Lyman α emission (up to ∼3 kR) observed by TIMED/GUVI on 2–6 April (5 days). Its peak intensity decreased linearly from April 3 at a rate ∼740 R/day.
Yongliang Zhang, Sam Yee, Larry J. Paxton, William H. Swartz   +3 more
wiley   +1 more source

Auroral orientation curves and the auroral oval I

Tellus A: Dynamic Meteorology and Oceanography, 1969
A comparison has been made between the auroral orientation curves and the auroral oval determined from the occurrence of the aurora. It has been found that the auroral orientation curve crossing the midnight meridian at 67° corrected geomagnetic latitude is located within the auroral oval. The largest difference between the location of the auroral oval
openaire   +1 more source

Unusual Enhancement in He(23S) Airglow Brightness Associated With Interplanetary Magnetic Field Northward Turnings During the 2025 New Year's Day Storm

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract The upper thermosphere is important in the context of space weather, but continuous monitoring of the thermosphere at high latitudes remains limited despite its strong variations associated with geomagnetic activity. Orthohelium, He(23S), is found from the upper thermosphere to lower exosphere, and is a promising tracer of atmospheric dynamics.
Takanori Nishiyama, Masato Kagitani, Noora Partamies, Daniel Whiter, Takuo T. Tsuda, Yasunobu Ogawa, Fred Sigernes   +6 more
wiley   +1 more source