Results 81 to 90 of about 4,774 (237)

Performance Investigation of Four Ionospheric Models in Estimating hmF2 in High‐Latitude Regions

Space Weather, Volume 24, Issue 7, July 2026.
Abstract As a critical parameter characterizing the vertical structure of the ionosphere, the peak height of the F2 layer (hmF2) plays an essential role in frequency selection and signal propagation in high‐frequency (HF) communication systems. Accurate prediction of hmF2 is particularly important in high‐latitude regions.
T. Y. Li, Q. Yu, Y. F. Shi, C. Yang, J. Q. Fan, J. Wang   +5 more
wiley   +1 more source

Reconnection in a rotation-dominated magnetosphere and its relation to Saturn's auroral dynamics [PDF]

, 2005
peer reviewed[1] The first extended series of observations of Saturn's auroral emissions, undertaken by the Hubble Space Telescope in January 2004 in conjunction with measurements of the upstream solar wind and interplanetary magnetic field ( IMF) by the
D. Grodent (7590713), Badman, S. V., Grodent, Denis, J. T. Clarke (7590707), S. W. H. Cowley (7590302), Gérard, J.-c., C.M. Jackman (7590716), Bunce, E.J., Badman, Sarah V., Clarke, J. T., Milan, S.E., Jackman, C. M., Jackman, C.M., Gérard, Jean-Claude, Badman, S.V., Yeoman, T. K., Tim K. Yeoman (7583066), Milan, S. E., Jackman, Caitriona M., Cowley, S.W.H., Grodent, D., E. J. Bunce (7590470), Steve E. Milan (7589666), S. V. Badman (7590704), J.-C. Gérard (7590710), Clarke, J.T., Cowley, S. W. H., Bunce, E. J., Gérard, J.C., Yeoman, T.K.   +29 more
core   +1 more source

Multi‐Instrument Observations of Ion‐Neutral Coupling in the Dayside Cusp

Geophysical Research Letters, 2020
Using data from the Scanning Doppler Imager, the Super Dual Auroral Radar Network, the EISCAT Svalbard Radar, and an auroral all‐sky imager, we examine an instance of F region neutral winds which have been influenced by the presence of poleward moving ...
D. D. Billett, K. Hosokawa, A. Grocott, J. A. Wild, A. L. Aruliah, Y. Ogawa, S. Taguchi, M. Lester   +7 more
doaj   +1 more source

On the nature of nighttime ionisation enhancements observed with the Athens Digisonde [PDF]

Annales Geophysicae, 2002
True height electron density profiles observed with the Athens Digisonde were analyzed together with geomagnetic data indices for six magnetic storms in September and October 2000 in an effort to define the ionospheric structure during events of ...
I. Tsagouri, I. Tsagouri, A. Belehaki
doaj   +1 more source

Observing the Earth's Plasmasphere and Ionosphere From the Lunar Surface

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract We present the analysis of the first lunar‐based observational characterization of the Earth's plasmasphere and ionosphere using Global Navigation Satellite Systems signals tracked from the lunar surface by the Lunar GNSS Receiver Experiment (LuGRE). The Earth‐Moon geometry enables limb sounding of the plasmasphere at altitudes exceeding 3,000 
C. Cesaroni, L. Spogli, M. Guerra, R. Ghidoni, V. Ventriglia, A. Minetto, A. Nardin, L. Alfonsi, F. Dovis   +8 more
wiley   +1 more source

Comparison of methods to determine auroral ionospheric conductances using ground-based optical and riometer data [PDF]

, 2008
Ground-based images of auroral optical emissions and cosmic radio noise absorption provide information on particle precipitation which enhances ionospheric conductances.
A. Senior, Senior, A., Kosch, M.J., M. J. Kosch, F. Honary, Honary, F.   +5 more
core   +1 more source

A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars [PDF]

Annales Geophysicae, 2002
The HF radars of the Super Dual Auroral Radar Network (SuperDARN) provide measurements of the E × B drift of ionospheric plasma over extended regions of the high-latitude ionosphere. We have conducted a statistical study of the associated Doppler
J.-P. Villain, J.-P. Villain, R. André, M. Pinnock, R. A. Greenwald, C. Hanuise, C. Hanuise   +6 more
doaj   +1 more source

Electron Scattering by Highly Oblique Quasi‐Electrostatic Chorus Waves Under Realistic Magnetospheric Conditions

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Using Van Allen Probes data (2013–2015), we report that highly oblique chorus waves frequently occur in low‐density regions where fpe/fce≈3 ${f}_{\text{pe}}/{f}_{\text{ce}}\approx 3$. These waves exhibit an electric‐to‐magnetic energy ratio PE/c2PB>0.5 $\sqrt{{P}_{\mathrm{E}}/{c}^{2}{P}_{\mathrm{B}}} > 0.5$, much higher than the typical <0.1 ${
Lixian Yang, Si Liu, Zhonglei Gao, Wenya Li, Fuliang Xiao, Zhaoguo He, Xingran Chen, Yuyue Jin, Qian He, Zhoukun Deng, Jiawen Tang   +10 more
wiley   +1 more source

Magnetospheric signatures of ionospheric density cavities observed by Cluster [PDF]

, 2015
AJBR ackowledges support from STFC under consolidated grant ST/K000993/1.We present Cluster measurements of large amplitude electric fields corre- lated with intense downward field-aligned currents, observed during a nightside crossing of the auroral ...
Wright, A. N., Karlsson, Tomas, A. J. B. Russell, A. N. Wright, T. Karlsson, Wright, Andrew Nicholas, Russell, A. J. B., Karlsson, T., Russell, Alexander John Barkway, Karlsson, Tomas,   +9 more
core   +1 more source

Auroral Ionospheric Erosion at Jupiter

Journal of Geophysical Research: Space Physics
Abstract The generation of Jupiter's main auroral oval is dominated by broadband‐energy electron beams, in contrast with the dominance of peaked electron energy spectra at Earth. Wave‐particle interactions involving Alfvén waves have been theorized to be the main mechanism driving the broadband acceleration of electrons.
Nicholas S Kruegler, Ali H. Sulaiman, Sadie Suzanne Elliott, William S Kurth, Robert Louis Lysak, Scott J Bolton   +5 more
openaire   +1 more source