Results 81 to 90 of about 77,336 (163)

Nighttime ionospheric D region: Equatorial and nonequatorial [PDF]

Journal of Geophysical Research: Space Physics, 2009
Nighttime ionospheric D region parameters are found to be generally well modeled by the traditional H′ and β as used by Wait and by the U.S. Navy in their Earth‐ionosphere VLF radio waveguide programs. New comparisons with nonequatorial, mainly all‐sea VLF path observations reported over several decades are shown to be consistent with the previously ...
Neil R. Thomson, Wayne M. McRae
openaire   +1 more source

Earthward O+ Injections in the Plasma Sheet Boundary Layer During Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract During geomagnetic storms, energetic ions are injected from the Earth's magnetotail along the plasma sheet boundary layer (PSBL). Owing to its off‐equatorial inclined orbit, the Arase satellite is in a prime position to observe these injections in the PSBL on the nightside at the apogee.
M. M. H. Kalliokoski, L. M. Kistler, K. Asamura, S. Kasahara, Y. Miyoshi, K. Keika, T. Hori, A. Matsuoka, K. Yamamoto, J. Liao   +9 more
wiley   +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

Interplanetary magnetic field and the equatorial ionosphere

, 1974
With the increase of the southward component of the interplanetary magnetic field, the magnitude of the east-west drift speed in the F-region of the ionosphere at Thumba, close to the magnetic equator, decreases for the daytime as well as for the ...
Chandraa, H., Rastogi, R. G.
core   +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

Suprathermal particle observations in the nighttime ionosphere at low latitudes

Geophysical Research Letters, 1977
A rocket borne electrostatic analyzer was flown through the near equatorial ionosphere, up to L ∼ 1.3, at night, during a magnetic storm associated with spread‐F. After careful correction of the observed signal, which was highly contaminated by the U.V. night glow, it appears a field aligned, upwards directed flux of soft ions with a power law spectrum,
Renée Prangé, Jean‐François Crifo
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

Coupled Thermosphere–Ionosphere–Plasmasphere Disturbances During the April 2023 Geomagnetic Storm: A Ground‐Based Multiparametric Study Across the American and European Sectors

Journal of Geophysical Research: Space Physics, Volume 131, Issue 10, October 2026.
Abstract The April 2023 geomagnetic storm significantly impacted the thermosphere‐ionosphere system, particularly over South America and midlatitude regions. This study analyzes ground‐based geomagnetic and ionospheric data, alongside Swarm satellite measurements, to investigate the physical mechanisms driven by intense solar wind energy input ...
L. Perrone, M. Regi, G. Carnevale, C. Scotto, D. Sabbagh, A. Ippolito, A. Del Corpo, D. Sciarra, B. Heilig   +8 more
wiley   +1 more source

Observations of the Ionosphere Using the Tiny Ionospheric Photometer [PDF]

, 2009
The Tiny Ionospheric Photometer (TIP) on the Constellation Observing System for Meteorology, Ionosphere, and Climate (FORMOSAT-3/COSMIC) characterizes the nighttime ionosphere using 135.6-nm radiative recombination emission.
Scott A. Budzien, Kenneth F. Dymond, David N. Anderson, Clayton Coker, Damien H. Chua, Jann-Yenq Liu, Sunanda Basu, Todd R. Pedersen   +7 more
core   +1 more source

Extended lateral heating of the nighttime ionosphere by ground‒based VLF transmitters

Journal of Geophysical Research: Space Physics, 2013
The effects of ground‒based very low frequency (VLF) transmitters on the lower ionosphere are investigated. Controlled modulation experiments are performed with the 21.4 kHz, 424 kW VLF transmitter NPM in Lualualei, Hawaii, and physical effects of the NPM transmissions are studied with a subionospherically propagating VLF probe signal.
K. L. Graf, M. Spasojevic, R. A. Marshall, N. G. Lehtinen, F. R. Foust, U. S. Inan   +5 more
openaire   +4 more sources