Wind control of the propagation of acoustic gravity waves in the polar atmosphere

Fedorenko, A.K.; Kryuchkov, E. I.

doi:10.1134/s0016793213030055

Cited by 18 publications

(10 citation statements)

References 16 publications

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“…Some results of the ionospheric disturbance propagation direction were reported in literature based on other types of measurements in middle and high latitudes [ He et al , ; Galushko et al , ; Crowley et al , ]. For example, the rotation of the TID propagation direction throughout the day was reported by Crowley et al [] based on their measurements in Antarctic Peninsula using HF radar, and a similar effect was mentioned by other authors [ He et al , ; Sopin et al , ; Fedorenko and Kryuchkov , ]. For example, He et al [] reported that in their observations the MSTIDs propagated mostly to NW during the day; however, at around 09 LT the propagation direction changed to NE, and in the afternoon (~15 LT) TIDs again propagated to the north or NW.…”

Section: Discussionsupporting

confidence: 58%

“…Afraimovich et al [] and Cowling et al [] pointed that thermospheric wind can produce a filtering effect on the AGW propagation direction, and Crowley et al [] and MacDougall et al [] demonstrated that at the F 2 region heights medium‐scale TIDs tend to propagate in the direction opposite to the thermospheric wind direction. Fedorenko and Kryuchkov [] established a systematic propagation of the AGW from the nighttime sector of the auroral oval into its daytime sector. During that period, some of the wavelike disturbances propagated in the direction of 14–16 h with respect to the global thermospheric wind blowing from the lower latitudes.…”

Section: Discussionmentioning

confidence: 99%

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Statistics of ionospheric disturbances over the Antarctic Peninsula as derived from TEC measurements

et al. 2016

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Results of ionospheric disturbances observations using multisite total electron content (TEC) measurements over the Antarctic Peninsula for the period from 2009 to 2012 are presented. Diurnal dependencies of the disturbance occurrence frequency, velocity, and direction of motion are established. Parameters of the disturbances are calculated using dynamic approach to the problem of ionospheric disturbances diagnostics which has been extended to allow for an arbitrary waveform of TEC perturbations. Specific data quality constraints are introduced to determine the presence of wavelike disturbances in the TEC records and to satisfy the required accuracy of parameter reconstruction. Statistical treatment of the results shows that during the daytime disturbances propagate predominantly in the northern and northeastern directions. In the evening and nocturnal hours the northwestern direction is prevailing, with the characteristic disturbance velocities ranging from 10 to 250 m/s. The most probable velocities are tens of meters per second, while the mean values are equal to about 100–130 m/s. In the daytime the velocities of the ionospheric disturbances are even higher. During the Antarctic winter time disturbances are usually observed at local noon time, in sharp contrast with the summer time, when they are present during the nights and mornings.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Statistics of ionospheric disturbances over the Antarctic Peninsula as derived from TEC measurements

et al. 2016

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“…The results consistently show that the observed waves almost always propagated southward during the winter times. However, there have been studies establishing the local time dependency of MSTIDs during the course of the day (e.g., Crowley et al, ; Fedorenko & Kryuchkov, ; Galushko et al, ; He et al, ; MacDougall et al, ).…”

Section: Introductionmentioning

confidence: 99%

Seasonal Propagation Characteristics of MSTIDs Observed at High Latitudes Over Central Alaska Using the Poker Flat Incoherent Scatter Radar

et al. 2018

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Near‐continuous electron density measurements obtained over a ∼3 year period, 2010–2013, using the Poker Flat Incoherent Scatter Radar (PFISR) in central Alaska (69°N, 147°W) have been analyzed to quantify the properties of over 650 high‐latitude medium‐scale traveling ionospheric disturbances (MSTIDs). Our analysis focused on the altitude range 100–300 km encompassing the lower ionosphere/thermosphere and yielded first full seasonal day/night distributions of MSTIDs at high northern latitudes with mean values: horizontal wavelength 446 km, horizontal phase speed 187 m/s, and period 41 min. These year‐round measurements fill an important summertime gap in existing MSTID measurements revealing predominantly eastward wave propagation during the summer, while continued winter season observations agree well with previous reports of near southward propagating MSTIDs. Our 3 years of results suggest a cyclic change in the seasonal horizontal propagation directions that was found to be quantitatively consistent with critical level wind and dissipative filtering. Concurrent measurements of the vertical wavelength spectrum as a function of altitude also compared favorably in shape with that calculated using a theoretical dispersion relation (Vadas & Fritts, 2005, https://doi.org/10.1029/2004JD005574) for the thermosphere, but with a higher mean value. Evidence supporting the systematic broadening and shrinking in the azimuthal distributions of the MSTIDs during the course of the year was also found, as well as an unexpected correlation between the MSTID propagation directions and the AE index, both of which are under further investigation.

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“…Azimuths of the propagation of these AGW demonstrate the close connection with the directions of background winds in the thermosphere. Moreover, the amplitudes of the waves depend on the speed of headwind but do not depend on height (Fedorenko and Kryuchkov, 2013;Fedorenko et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Evanescent acoustic-gravity modes in the isothermal atmosphere: systematization, applications to the earth's and solar atmospheres

Cheremnykh¹,

Fedorenko²,

Kryuchkov³

et al. 2019

Preprint

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Abstract. The objects of research in this work are evanescent wave modes in a gravitationally stratified atmosphere and their associated pseudo-modes. Whereas the former, according to the dispersion relation, rapidly decrease with distance from a certain surface, the latter, having the same dispersion law, differ from the first by the form of polarization and the character of its decreasing away from the surface. Within a linear hydrodynamic model, the propagation features of evanescent wave modes in an isothermal atmosphere are studied. Research carried out for different assumptions about the properties of the medium. On this way, a new wave mode – anelastic evanescent wave mode – was discovered. Also, the possibility of the existence of a pseudo-mode related to it is indicated. The case of two isothermal media differing in temperature at the interface is studied in detail. It is shown that a non-divergent pseudo-mode with the dispersion of solar f-mode type can be realized on the interface for the specified horizontal scale. The newly discovered dispersion relation, at the interface of two media, is satisfied by the wave mode, which has different types of amplitude versus height dependencies at different horizontal scales. The applicability of the obtained results to clarify the properties of f-mode observed on the Sun is analyzed.

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Wind control of the propagation of acoustic gravity waves in the polar atmosphere

Cited by 18 publications

References 16 publications

Statistics of ionospheric disturbances over the Antarctic Peninsula as derived from TEC measurements

Statistics of ionospheric disturbances over the Antarctic Peninsula as derived from TEC measurements

Seasonal Propagation Characteristics of MSTIDs Observed at High Latitudes Over Central Alaska Using the Poker Flat Incoherent Scatter Radar

Evanescent acoustic-gravity modes in the isothermal atmosphere: systematization, applications to the earth's and solar atmospheres

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