Results 31 to 40 of about 614 (179)

Unsolved problems: Mesoscale polar cap flow channels’ structure, propagation, and effects on space weather disturbances

Frontiers in Astronomy and Space Sciences, 2023
Dynamic mesoscale flow structures move across the open field line regions of the polar caps and then enter the nightside plasma sheet where they can cause important space weather disturbances, such as streamers, substorms, and omega bands.
Larry R. Lyons, Yukitoshi Nishimura, Jiang Liu, Jiang Liu, Ying Zou, William A. Bristow, Sneha Yadav, Eric Donovan, Nozomu Nishitani, Kazuo Shiokawa, Keisuke Hosokawa   +10 more
doaj   +1 more source

Polar substorm on 7 December 2015: preonset phenomena and features of auroral breakup [PDF]

Annales Geophysicae, 2020
Comprehensive analysis of a moderate 600 nT substorm was performed using simultaneous optical observations inside the auroral oval and in the polar cap, combined with data from satellites, radars, and ground magnetometers.
V. V. Safargaleev, A. E. Kozlovsky, V. M. Mitrofanov   +2 more
doaj   +1 more source

Fine structure of breakup development inferred from satellite and ground-based observations [PDF]

Annales Geophysicae, 2008
More than 60 breakups, including weak activations of the pseudo-breakup type, moderate breakups, and events of very strong auroral activity, were analyzed using ground-based TV data, together with satellite auroral images.
T. A. Kornilova, I. A. Kornilov, O. I. Kornilov   +2 more
doaj   +1 more source

Observations of an auroral streamer in a double oval configuration [PDF]

Annales Geophysicae, 2011
During the late evening and night of 14 September 2004, the nightside auroral oval shows a distinct double oval configuration for several hours after a substorm onset at ~18:45 UT.
O. Amm, R. Nakamura, T. Takada, K. Kauristie, H. U. Frey, C. J. Owen, A. Aikio, R. Kuula   +7 more
doaj   +1 more source

Evaluating Auroral Forecasts Against Satellite Observations

Space Weather, 2021
The aurora is a readily visible phenomenon of interest to many members of the public. However, the aurora and associated phenomena can also significantly impact communications, ground‐based infrastructure, and high‐altitude radiation exposure ...
M. K. Mooney, M. S. Marsh, C. Forsyth, M. Sharpe, T. Hughes, S. Bingham, D. R. Jackson, I. J. Rae, G. Chisham   +8 more
doaj   +1 more source

Space weather with an arc’s ∼2 h trip across the nightside polar cap

Frontiers in Astronomy and Space Sciences
Flow channels can extend across the polar cap from the dayside to the nightside auroral oval, where they lead to localized reconnection and auroral oval disturbances.
Larry R. Lyons, Yukitoshi Nishimura, Jiang Liu, Jiang Liu, Sneha Yadav, Ying Zou, William A. Bristow, Eric Donovan, Nozomu Nishitani   +8 more
doaj   +1 more source

OVATION: Oval variation, assessment, tracking, intensity, and online nowcasting [PDF]

Annales Geophysicae, 2002
The location of the auroral oval and the intensity of the auroral precipitation within it are basic elements in any adequate characterization of the state of the magnetosphere.
P. T. Newell, P. T. Newell, P. T. Newell, T. Sotirelis, J. M. Ruohoniemi, J. F. Carbary, K. Liou, J. P. Skura, C.-I. Meng, C. Deehr, D. Wilkinson, F. J. Rich   +11 more
doaj   +1 more source

Small scale purification and biophysical characterization of haptoglobin derived from human Cohn fraction IV

Biotechnology Progress, EarlyView.
Abstract Haptoglobin (Hp) is a polymorphic acute phase α‐2 glycoprotein found in plasma that plays a critical role in binding, neutralizing, and removing cell‐free hemoglobin (Hb) from the circulation. Under clinical conditions characterized by high levels of hemolysis, such as in patients with sickle cell disease (SCD), large quantities of cell‐free ...
Shuwei Lu, Mohd Asim Khan, Pedro Cabrales, David C. Irwin, Paul W. Buehler, Andre F. Palmer   +5 more
wiley   +1 more source

A Kp‐Driven Machine Learning Model Predicting the Ultraviolet Emission Auroral Oval

Journal of Geophysical Research: Machine Learning and Computation
Auroras can intuitively reflect the energy coupling between the Sun and the Earth and are an excellent indicator for monitoring and predicting space weather effects.
Huiting Feng, Dedong Wang, Yuri Y. Shprits, Artem Smirnov, Deyu Guo, Yoshizumi Miyoshi, Stefano Bianco, Shangchun Teng, Run Shi, Su Zhou, Yongliang Zhang   +10 more
doaj   +1 more source

A Model of Magnetic Pi 2 Pulsations Based on a ULF Obserbation from High- to Middle-Latitudes (d. ULF Waves in the Magnetosphere) (Proceedings of the Second Symposium on Coordinated Observations of the Ionosphere and Magnetosphere in the Polar Regions : Part I)

Antarctic Record, 1980
Spectral characteristics of magnetic Pi 2 pulsations are studied in detail by using data obtained simultaneously over a wide latitudinal range from the auroral region (L=8.9) through low-latitudes (L=1.8).
Masayuki KUWASHIMA
doaj   +1 more source