Parametric excitation of an acoustic mode

2003 ◽  
Vol 113 (4) ◽  
pp. 2282-2282
Author(s):  
Bruce Denardo ◽  
Derek B. Smith ◽  
Larry P. Varnadore ◽  
Wayne E. Prather
Keyword(s):  
Parametric Excitation ◽  
Acoustic Mode

scholarly journals Investigation of Ionospheric Response to June 2009 Sarychev Peak Volcano Eruption

2021 ◽  
Vol 13 (4) ◽  
pp. 638
Author(s):  
Nikolay Shestakov ◽  
Alexander Orlyakovskiy ◽  
Natalia Perevalova ◽  
Nikolay Titkov ◽  
Danila Chebrov ◽  
...  
Keyword(s):  
Acoustic Mode ◽  
Global Navigation Satellite Systems ◽  
Electron Content ◽  
Field Zone ◽  
Ionospheric Response ◽  
Satellite Systems ◽  
Volcano Eruption ◽  
Close Proximity ◽  
Global Navigation Satellite ◽  
Sarychev Peak

Global Navigation Satellite Systems have been extensively used to investigate the ionosphere response to various natural and man-made phenomena for the last three decades. However, ionospheric reaction to volcano eruptions is still insufficiently studied and understood. In this work we analyzed the ionospheric response to the 11–16 June 2009 VEI class 4 Sarychev Peak volcano eruption by using surrounding Russian and Japanese GPS networks. Prominent covolcanictotal electron content (TEC)ionospheric disturbances (CVIDs) with amplitudes and periods ranged between 0.03–0.15 TECU and 2.5–4.5 min were discovered for the three eruptive events occurred at 18:51 UT, 14 June; at 01:15 and 09:18 UT, 15 June 2009. The estimates of apparent CVIDs velocities vary within 700–1000 m/s in the far-field zone (300–900 km to the southwest from the volcano) and 1300–1800 m/s in close proximity toSarychev Peak. The characteristics of the observed TEC variations allow us to attribute them to acoustic mode. The south-southwestward direction is preferred for CVIDs propagation. We concluded that the ionospheric response to a volcano eruption is mainly determined by a ratio between explosion strength and background ionization level. Some evidence of secondary (F2-layer) CVIDs’ source eccentric location were obtained.

Kinetic instability of twisted ion-acoustic mode with superthermal species of plasma

2021 ◽  
Vol 70 ◽  
pp. 196-202
Author(s):  
S. Bukhari ◽  
Syed Raza Ali Raza ◽  
S. Ali
Keyword(s):  
Acoustic Mode ◽  
Ion Acoustic ◽  
Kinetic Instability

Streaming instability of dust-acoustic mode with helical wavefronts

2019 ◽  
Vol 62 ◽  
pp. 144-150
Author(s):  
S. Bukhari ◽  
M. Naqash ◽  
S. Ali ◽  
Muhammad Rafique
Keyword(s):  
Acoustic Mode ◽  
Streaming Instability ◽  
Dust Acoustic ◽  
Dust Acoustic Mode
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