Results 61 to 70 of about 756,404 (200)

Search for light ion outflow by incoherent scatter radar [PDF]

Radio Science, 2001
Regular observation of the polar wind was one of several measurements considered feasible when the European Incoherent Scatter (EISCAT) auroral zone incoherent scatter facility was first conceived. Whereas most of the other measurements proposed with EISCAT have been successful, direct observations of the polar wind using the standard incoherent ...
Løvhaug, U., Hagfors, T., van Eyken, A.
openaire   +2 more sources

Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data [PDF]

Annales Geophysicae, 1998
Incoherent scatter radars (ISR) are versatile instruments for continuous monitoring of ionisation processes in the Earth's atmosphere. EISCAT, The European Incoherent Scatter facility has proven effective also in meteor studies. The time resolution of
A. Pellinen-Wannberg, A. Westman, G. Wannberg, K. Kaila   +3 more
doaj   +1 more source

Coupled Thermosphere–Ionosphere Dynamics During the 17 January 2013 Storm: GITM–TIDAS Comparison With Millstone Hill ISR Measurements

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This article analyzes a weak geomagnetic storm on January 17–18, 2013, using a first‐principles model (Global Ionosphere Thermosphere Model (GITM) with an empirical assimilative ionospheric model (TIDAS), evaluated against observations in the form of Millstone Hill (MH) incoherent scatter radar (ISR) altitude profiles and global navigation ...
Onyinye Nwankwo‐Omoloja, Aaron J. Ridley, Shun‐Rong Zhang, Philip J. Erickson   +3 more
wiley   +1 more source

Influence of meteoric smoke particles on the incoherent scatter measured with EISCAT VHF [PDF]

Annales Geophysicae
Meteoric ablation in the Earth's atmosphere produces particles of nanometer size and larger. These particles can become charged and influence the charge balance in the D region (60–90 km) and the incoherent scatter observed with radar from there.
T. L. Gunnarsdottir, I. Mann, W. Feng, D. R. Huyghebaert, I. Haeggstroem, Y. Ogawa, N. Saito, S. Nozawa, T. D. Kawahara   +8 more
doaj   +1 more source

Electron‐Impact Excitation of N2 Is Insufficient to Produce the NO2 Continuum in STEVE

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract The most studied hypothesis for the continuum emission of Strong Thermal Emission Velocity Enhancement (STEVE) is the NO2 ${\text{NO}}_{2}$ continuum. The ion‐impact pathway for this emission was recently shown to be too slow by a few orders of magnitude. In this work, we evaluate the electron‐impact pathway.
Brian J. Harding, L. Claire Gasque
wiley   +1 more source

Estimation of Mesoscale Momentum Flux Frequency Spectra in the Mesosphere and Lower Thermosphere Using Multistatic Specular Meteor Radar Wind Fields

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract A spectrally resolved observational methodology is introduced to estimate mesoscale momentum flux frequency spectra in the mesosphere and lower thermosphere (MLT). The method is applied to four‐dimensional wind fields reconstructed with the physics‐informed neural network approach called the Hydrodynamic Point‐wise Environment Reconstructor ...
G. Mitra, J. L. Chau, J. F. Conte, J. M. Urco, T. Renkwitz, C. Jacobi   +5 more
wiley   +1 more source

Incoherent Scatter Radar Studies of Daytime Plasma Lines [PDF]

Earth, Moon, and Planets, 2018
First results from wideband (electron phase energies of 5–51 eV), high-resolution (0.1 eV) spectral measurements of photoelectron–enhanced plasma lines made with the 430 MHz radar at Arecibo Observatory are presented. In the F region, photoelectrons produced by solar EUV line emissions (He II and Mg IX) give rise to plasma line spectral peaks/valleys ...
Frank T. Djuth, Herbert C. Carlson, Liwei D. Zhang   +2 more
openaire   +1 more source

Characterization of High‐Frequency GNSS Total Electron Content Variations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract Global Navigation Satellite System (GNSS)–derived Total Electron Content (TEC) is widely used to investigate ionospheric variability, but has primarily been applied to low‐frequency fluctuations. Here we present a long‐term statistical characterization of high‐frequency (30–500 mHz) TEC variations using multi‐constellation GNSS data from 11 ...
J. Pérez‐Coll Jiménez, N. Ivchenko, N. Partamies, M. Håkansson   +3 more
wiley   +1 more source

OI 630 nm Airglow Observed From Space as a Diagnostic of Nighttime Low‐Latitude Ionospheric Dynamics

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract This study investigates the nighttime morphology of the bottomside F region (∼250 km) at low latitudes using 630 nm airglow measurements from the Visible and Infrared Spectral Imager (VISI) aboard the Ionosphere, Mesosphere, Upper Atmosphere, and Plasmasphere (IMAP) mission on the International Space Station. For this purpose, we analyzed IMAP/
Hyosub Kil, Se‐Heon Jeong, Jeong‐Heon Kim, Woo Kyoung Lee, Young‐Sil Kwak, Akinori Saito, Takeshi Sakanoi   +6 more
wiley   +1 more source

MST Radar and Incoherent Scatter Radar Contributions to Studying the Middle Atmosphere

Journal of geomagnetism and geoelectricity, 1991
We outline the development of Mesosphere-Stratosphere-Troposphere (MST) radar research of the middle atmosphere with special emphasis on coupling processes from above and below. The coupling from above is important in high-latitude auroral regions and we therefore include into our descriptions also the Incoherent Scatter (IS) radar observations used to
openaire   +3 more sources