Results 41 to 50 of about 26,415 (203)

The correlation of ULF waves and auroral intensity before, during and after substorm expansion phase onset [PDF]

, 2012
We present case studies of the evolution of magnetic wave amplitudes and auroral intensity through the late growth phase and the expansion phase of the substorm cycle.
Akasofu, Akasofu, Angelopoulos, Angelopoulos, Angenheister, Arnoldy, Asamura, Bösinger, Bösinger, Chaston, Chaston, Chi, Clare E. J. Watt, David K. Milling, Dombeck, Donovan, Friedrich, Glassmeier, Harald U. Frey, Hughes, I. Jonathan Rae, Ian R. Mann, Jacobs, Kepko, Kyle R. Murphy, Lester, Lester, Liang, Liou, Liu, Liu, Louis G. Ozeke, Lui, Lysak, Mann, McPherron, Mende, Mende, Mende, Milling, Murphy, Murphy, Newell, Newton, Nishimura, Peñano, Rae, Rae, Rae, Rae, Saito, Sakaguchi, Shay, Smith, Takahashi, Uozumi, Voronkov, Walsh, Watt, Watt, Watt, Wu, Wygant, Yoshikawa   +63 more
core   +1 more source

Resonant ULF waves: A new interpretation

Geophysical Research Letters, 1985
Many important properties of ultra‐low frequency (ULF) magnetic pulsations (∼1 to 10 minute periods) observed in the magnetosphere and by ground‐based magnetometers have been interpreted successfully in terms of resonant field line models. These models describe the pulsations as transverse hydromagnetic waves standing on dipole flux tubes with fixed ...
Margaret G. Kivelson, David J. Southwood
openaire   +1 more source

Multiradar observations of substorm‐driven ULF waves [PDF]

Journal of Geophysical Research: Space Physics, 2016
AbstractA recent statistical study of ULF waves driven by substorm‐injected particles observed using Super Dual Auroral Radar Network (SuperDARN) found that the phase characteristics of these waves varied depending on where the wave was observed relative to the substorm. Typically, positive azimuthal wave numbers, m, were observed in waves generated to
James, Matthew K., Yeoman, T. K., Mager, P. N., Klimushkin, D. Yu   +3 more
openaire   +2 more sources

Wavelet-based ULF wave diagnosis of substorm expansion phase onset [PDF]

, 2009
Using a discrete wavelet transform with a Meyer wavelet basis, we present a new quantitative algorithm for determining the onset time of Pi1 and Pi2 ULF waves in the nightside ionosphere with ∼20- to 40-s resolution at substorm expansion phase onset.
Akasofu, Angelopoulos, Angelopoulos, Angelopoulos, Baker, Baumjohann, Bosinger, Christopher T. Russell, Clare E. J. Watt, Cramoysan, Daubechies, David K. Milling, Donovan, Frey, Frey, Gelpi, Harald U. Frey, Huba, I. Jonathan Rae, Ian R. Mann, Jacobs, Kisabeth, Kyle R. Murphy, Lessard, Lester, Lester, Liang, Louis Ozeke, Lui, Lui, Lyons, Lysak, Mann, McPherron, Meyer, Milling, Nose, Olson, Petrukovich, Posch, Rae, Roux, Russell, Russell, Russell, Samson, Shiokawa, Shiokawa, Smith, Tsyganenko, Vassilis Angelopoulos, Vasyliunas, Voronkov, Østgaard, Østgaard   +54 more
core   +1 more source

Numerical study of the generation and propagation of ultralow-frequency waves by artificial ionospheric F region modulation at different latitudes [PDF]

Annales Geophysicae, 2016
Powerful high-frequency (HF) radio waves can be used to efficiently modify the upper-ionospheric plasmas of the F region. The pressure gradient induced by modulated electron heating at ultralow-frequency (ULF) drives a local oscillating diamagnetic ...
X. Xu, C. Zhou, R. Shi, B. Ni, Z. Zhao, Y. Zhang   +5 more
doaj   +1 more source

ULF wave activity in the magnetosphere: resolving solar wind interdependencies to identify driving mechanisms [PDF]

, 2018
Ultra-low frequency (ULF) waves in the magnetosphere are involved in the energisation and transport of radiation belt particles and are strongly driven by the external solar wind.
Agapitov, Archer, Baker, Barnes, Berube, Brautigam, Cao, Chen, Chi, Claudepierre, Cowley, Degeling, Dungey, Elkington, Elkington, Elkington, Engebretson, Farrugia, Farrugia, Freeman, Fälthammar, Geiss, Gillis, Glassmeier, Gratton, Hapgood, Hartinger, Horne, Hwang, Jian, Johnson, Kavosi, Kellerman, Kepko, Kim, Kivelson, Kivelson, Komar, Kuo, Li, Liu, Liu, Lockwood, Lockwood, Mann, Mann, Mann, Mann, Mann, Mathie, Mathie, McIlwain, McPherron, Menk, Mishin, Murphy, Nakagawa, Newbury, Obayashi, Otto, Owens, Owens, Owens, Owens, Ozeke, Ozeke, Ozeke, Ozeke, Pahud, Paschmann, Percival, Plunkett, Pokhotelov, Radoski, Rae, Rae, Reeves, Rostoker, Russell, Russell, Russell, Schwartz, Shue, Sibeck, Simms, Song, Southwood, Spasojevic, Stoica, Takahashi, Takahashi, Takahashi, Takahashi, Thomson, Walker, Walker, Walker, Wang, Wang, Wolfe, Zong   +100 more
core   +2 more sources

A case study of large-amplitude ULF waves in the Martian foreshock

Earth and Planetary Physics, 2020
Foreshock ultralow frequency (ULF) waves constitute a significant physical phenomenon in the plasma environment of terrestrial planets. The occurrence of these waves, associated with backstreaming particles reflected and accelerated at the bow shock ...
LiCan Shan, YaSong Ge, AiMin Du
doaj   +1 more source

High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter [PDF]

Annales Geophysicae, 2004
The EISCAT high power heating facility at Tromsø, northern Norway, has been utilised to generate artificial radar backscatter in the fields of view of the CUTLASS HF radars.
D. M. Wright, T. K. Yeoman, L. J. Baddeley, J. A. Davies, J. A. Davies, R. S. Dhillon, M. Lester, S. E. Milan, E. E. Woodfield, E. E. Woodfield   +9 more
doaj   +1 more source

Modulation of NTC frequencies by Pc5 ULF pulsations : experimental test of the generation mechanism and magnetoseismology of the emitting surface [PDF]

, 2009
Nonthermal continuum (NTC) radiation is believed to be emitted by the conversion of an electrostatic wave into an electromagnetic one, which takes place at the Earth's magnetic equator.
Anderson, Balogh, Bernstein, C. Foullon, Calvert, Canu, Cheng, Christiansen, Denton, Décréau, Décréau, Décréau, Engebretson, Eriksson, Etcheto, G. Le Rouzic, Gough, Gough, Gurnett, Gurnett, Gustafsson, Hudson, Hughes, Kasaba, Kennel, Kurth, Kurth, Loewe, Loto'Aniu, Mager, Mann, Melrose, Morgan, Oya, P. M. E. Décréau, Pierrard, Rönnmark, S. Grimald, Schäfer, Singer, Takahashi, Tsyganenko, X. Suraud, X. Vallières   +43 more
core   +3 more sources

Modulation of Locally Generated Equatorial Noise by ULF Wave [PDF]

Journal of Geophysical Research: Space Physics, 2019
AbstractIn this paper we report a rare and fortunate event of fast magnetosonic (MS, also called equatorial noise) waves modulated by compressional ultralow frequency (ULF) waves measured by Van Allen Probes. The characteristics of MS waves, ULF waves, proton distribution, and their potential correlations are analyzed.
Hui Zhu, Lunjin Chen, Xu Liu, Yuri Y. Shprits   +3 more
openaire   +3 more sources