Results 41 to 50 of about 756,404 (200)

A comparison of velocity measurements from the CUTLASS Finland radar and the EISCAT UHF system [PDF]

Annales Geophysicae, 1999
The CUTLASS Finland radar, which comprises an integral part of the SuperDARN system of HF coherent radars, provides near continuous observations of high-latitude plasma irregularities within a field-of-view which extends over some four million square ...
J. A. Davies, M. Lester, S. E. Milan, T. K. Yeoman   +3 more
doaj   +1 more source

Superdarn radar HF propagation and absorption response to the substorm expansion phase [PDF]

, 2002
International audienceCoherent scatter HF ionospheric radar systems such as SuperDARN offer a powerful experimental technique for the investigation of the magnetospheric substorm.
J. A. Davies, Milan, S. E., Honary, F., T. K. Yeoman (7601525), J. A. Davies (4412452), J. K. Gauld (7674179), F. Honary (7604621), T. K. Yeoman, Davies, J. A., S. E. Milan, J. K. Gauld, F. Honary, Yeoman, T. K., S. E. Milan (7594526), Gauld, J. K.   +14 more
core   +2 more sources

Triangulating the height of cosmic noise absorption: A method for estimating the characteristic energy of precipitating electrons [PDF]

, 2010
Energetic electrons (tens to hundreds of keV) deposit significant energy into the D layer of the ionosphere. Riometers provide a means of monitoring this electron precipitation by measuring the associated cosmic noise absorption (CNA), but individually ...
P. Wild, A. Senior, Senior, A., Kavanagh, A.J., A. J. Kavanagh, Wild, P., F. Honary, Honary, F.   +7 more
core   +4 more sources

Toolkit for incoherent scatter radar experiment design and applications to EISCAT_3D [PDF]

Annales Geophysicae
Modern phased-array incoherent scatter radar (ISR) systems consist of several thousand phased-array antenna elements. Next-generation phased-array ISR systems are shifting towards multistatic setups consisting of three sites, such as EISCAT_3D with sites
S. M. Hatch, I. Virtanen, K. M. Laundal, H. W. Tesfaw, J. Vierinen, D. R. Huyghebaert, A. Spicher, J. C. Hessen   +7 more
doaj   +1 more source

Accelerating Mission Engineering: Evidence of a Stratified Landscape and a Path Toward Unified Practice

Systems Engineering, EarlyView.
ABSTRACT Mission Engineering is maturing as a Systems Engineering discipline, yet adoption of its common frameworks remains stratified. This study examines whether selective adoption is observable across ME scholarship and develops a framework to address identified barriers.
James Moreland, Nathaniel Ambler, Casey LaMar, Maegen Nix, Craig Sawyer   +4 more
wiley   +1 more source

Global Ionospheric Responses to Four X‐Class Solar Flares in November 2025

Space Weather, Volume 24, Issue 11, November 2026.
Abstract We investigate global ionospheric responses to four X‐class solar‐disk flares that occurred in November 2025 from the same solar active region, using multi‐instrument observations including GNSS, ionosonde, geomagnetic and GOES solar irradiance data. Pronounced dayside TEC enhancements are observed for three flares (#2 X1.2, #3 X5.1, and #4 X4.
Lei Liu, Shasha Zou
wiley   +1 more source

Incoherent Scatter Radar User Workshop

Eos, Transactions American Geophysical Union, 1984
The incoherent scatter radar technique has developed over the years into one of the most powerful tools for investigating physical processes in the upper atmosphere. The National Science Foundation (NSF) now supports a chain of four incoherent scatter facilities at Sondrestromfjord (Greenland), Millstone Hill (Massachusetts), Arecibo (Puerto Rico), and
openaire   +1 more source

A Predictable Component of the Internal Tide on a Narrow Continental Shelf

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Coastal internal tides are considered unpredictable: harmonic fits to depth‐varying baroclinic velocity explain little variance. We show the depth‐averaged coastal internal tide is predictable from astronomical forcing. On the inner shelf, coastal trapped wave (CTW) modes are approximately depth‐uniform, so depth‐averaging recovers their ...
K. Okun, A. J. Lucas, E. Masunaga, G. Pawlak   +3 more
wiley   +1 more source

Letter to the Editor: First complementary observations by ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar [PDF]

Annales Geophysicae, 1998
Experimental results are presented from ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar. Tomographic measurements on 10 October 1996, showing a narrow, field-aligned enhancement in electron density in the post-noon sector of
C. N. Mitchell, I. K. Walker, S. E. Pryse, I. Kersley, I. W. McCrea, T. B. Jones   +5 more
doaj   +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