Winds and tides in the mid-latitude Southern Hemisphere upper mesosphere recorded with the Falkland Islands SuperDARN radar

Hibbins, R. E.; Freeman, M. P.; Milan, S. E.; Ruohoniemi, J. M.

doi:10.5194/angeo-29-1985-2011

Cited by 19 publications

(59 citation statements)

References 62 publications

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“…The behavior of the observed phases and amplitudes of the tides at Hankasalmi are similar to tides at 95 km altitude observed with an All‐Sky Interferometric Meteor Radar at Esrange (68°N, 21°E) [ Mitchell et al , ]. The smaller tidal amplitude measured by the SuperDARN radars is a common feature that has been attributed to sidelobe effects [ Yukimatu and Tsutsumi , ] or to the combination of the large vertical integration of the SuperDARN radar together with a finite vertical wavelength of the tide [ Hibbins et al , ].…”

Section: Discussionsupporting

confidence: 60%

“…Differences in the amplitude of the semidiurnal tide derived from noninterferometric Super-DARN radars and other MLT radar systems can largely be explained by the short vertical wavelength of this tide combined with the poor vertical resolution of the SuperDARN radar winds, with back lobe contamination of the SuperDARN radars playing a negligible role [e.g., Hibbins et al, 2011]. Although there is relatively poorer agreement in the amplitude of the smaller diurnal tide between SuperDARN and other radars, these differences have been ascribed to the diurnal variation in meteor count rate, with low meteor counts in the evening creating large uncertainties in the inferred winds [Hussey et al, 2000;Thayaparan and Hocking, 2002].…”

Section: Datamentioning

confidence: 99%

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The climatology of zonal wave numbers 1 and 2 planetary wave structure in the MLT using a chain of Northern Hemisphere SuperDARN radars

Kleinknecht

Hibbins²

2014

JGR Atmospheres

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The zonal wave components 1 and 2 were extracted from the meridional wind along the latitude band of 51–66°N for the years 2000–2008 using eight Super Dual Auroral Radar Network (SuperDARN) radars spanning longitudes from 25°E to 150°W. Each extracted zonal component represents the superposition of all temporal periods with that zonal structure and indicates the total planetary wave energy available with that wave number. The Hovmöller diagrams show stationary as well as eastward and westward traveling planetary waves propagating in the background wind. The method used to detect the zonal planetary wave components in the SuperDARN data are detailed and validated using UK Meteorological Office data, which allows the evolution of S1 and S2 planetary wave energy between the stratosphere and mesosphere to be assessed. The climatology of zonal wave number 1 and 2 planetary wave activity in the mesosphere‐lower thermosphere (MLT) is presented and compared to the activity in the stratosphere. The MLT climatology of the mean wind anomalies shows stronger planetary wave activity during winter and weaker activity during summer with enhancement around midsummer and autumn equinox. The climatology of the mean wind displays similar amplitudes apart from very strong S1 planetary wave amplitudes during summer. In addition planetary wave activity during winters with major and minor stratospheric warming events are examined and contrasted.

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Section: Discussionsupporting

confidence: 60%

Section: Datamentioning

confidence: 99%

The climatology of zonal wave numbers 1 and 2 planetary wave structure in the MLT using a chain of Northern Hemisphere SuperDARN radars

Kleinknecht

Hibbins²

2014

JGR Atmospheres

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“…These AGWs are most likely to break at the mesopause, but measurements of mesospheric winds by SuperDARN are possible (e.g., Hibbens et al, 2011) as are radar echoes which have similar annual occurrence distributions to polar mesosphere summer echoes, PMSE (e.g., Ogawa et al, 2003;Hosokawa et al, 2005). The AGWs caused by the thunderstorms may be visible in the variabil ity of these observations.…”

Section: Superdarn and Energetic Charged Particlesmentioning

confidence: 99%

Energetic Charged Particles Above Thunderclouds

et al. 2012

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International audienceThe French government has committed to launch the satellite TARANIS to study transient coupling processes between the Earth's atmosphere and near-Earth space. The prime objective of TARANIS is to detect energetic charged particles and hard radiation emanating from thunderclouds. The British Nobel prize winner C.T.R. Wilson predicted lightning discharges from the top of thunderclouds into space almost a century ago. However, new experiments have only recently confirmed energetic discharge processes which transfer energy from the top of thunderclouds into the upper atmosphere and near-Earth space; they are now denoted as transient luminous events, terrestrial gamma-ray flashes and relativistic electron beams. This meeting report builds on the current state of scientific knowledge on the physics of plasmas in the laboratory and naturally occurring plasmas in the Earth's atmosphere to propose areas of future research. The report specifically reflects presentations delivered by the members of a novel Franco-British collaboration during a meeting at the French Embassy in London held in November 2011. The scientific subjects of the report tackle ionization processes leading to electrical discharge processes, observations of transient luminous events, electromagnetic emissions, energetic charged particles and their impact on the Earth's atmosphere. The importance of future research in this area for science and society, and towards spacecraft protection, is emphasized

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“…They have reported a summer maximum and equinoctial minimum in meteor counts with winter counts lying in between. Recently, using an extensive data base from both the Northern and Southern Hemispheres, it has been established that the meteoric influx peaks around May-Aug and shows a good correlation with sporadic E layer intensities (Hibbins et al, 2011;Haldoupis, 2011, and references therein). In order to assess the difference in the meteor influx during 2007 and 2009, we used the radio observations of daily meteor counts recorded at Mie (35.0 • N,136.6 • E, dip latitude 29.8 • N), Japan (Fig.…”

Section: Discussionmentioning

confidence: 99%

Occurrence of blanketing E<sub>s</sub> layer (E<sub>sb</sub>) over the equatorial region during the peculiar minimum of solar cycle 24

et al. 2014

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Abstract.A thin and highly dense sporadic E layer, which can occasionally block the upper ionospheric layers, is called blanketing sporadic E (E sb ). We present the statistical seasonal local time occurrence pattern of E sb at equatorial station Tirunelveli (8.7 • N, 77.8 • E, dip latitude 0.7 • N) during the extended minimum of solar cycle 24 (2007-2009). In spite of nearly the same average solar activity during both 2007 and 2009, considerable differences are noticed in the seasonal occurrence of E sb during this period. The percentage of E sb occurrence is found to be the highest during the summer solstice (≥ 50 %) for both 2007 and 2009, which is in general accordance with the earlier studies. The occurrences of E sb during the vernal equinox (∼ 33 %) and January-February (∼ 28 %) are substantial in 2009 as compared to those during the same seasons in 2007. We find that, during winter (January-February), ∼ 75 % of E sb occurred during or just after the period of sudden stratospheric warming (SSW). We suggest that enhanced E sb occurrence during winter (January-February) and the vernal equinox of 2009 could be associated with SSW-driven changes in the E region ambient conditions. Furthermore, the close association of E sb with counter equatorial electrojet (CEEJ) suggested by earlier studies is re-examined carefully using the scenario of E sb occurrence on non-CEEJ days. Such an exercise is crucial as we are unaware whether the physical mechanisms driving E sb and CEEJ are linked or not. We find that, of all the seasons, the association of E sb and CEEJ is strongest during winter (November-December).

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Winds and tides in the mid-latitude Southern Hemisphere upper mesosphere recorded with the Falkland Islands SuperDARN radar

Cited by 19 publications

References 62 publications

The climatology of zonal wave numbers 1 and 2 planetary wave structure in the MLT using a chain of Northern Hemisphere SuperDARN radars

The climatology of zonal wave numbers 1 and 2 planetary wave structure in the MLT using a chain of Northern Hemisphere SuperDARN radars

Energetic Charged Particles Above Thunderclouds

Occurrence of blanketing E<sub>s</sub> layer (E<sub>sb</sub>) over the equatorial region during the peculiar minimum of solar cycle 24

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Winds and tides in the mid-latitude Southern Hemisphere upper mesosphere recorded with the Falkland Islands SuperDARN radar

Cited by 19 publications

References 62 publications

The climatology of zonal wave numbers 1 and 2 planetary wave structure in the MLT using a chain of Northern Hemisphere SuperDARN radars

The climatology of zonal wave numbers 1 and 2 planetary wave structure in the MLT using a chain of Northern Hemisphere SuperDARN radars

Energetic Charged Particles Above Thunderclouds

Occurrence of blanketing E&lt;sub&gt;s&lt;/sub&gt; layer (E&lt;sub&gt;sb&lt;/sub&gt;) over the equatorial region during the peculiar minimum of solar cycle 24

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Occurrence of blanketing E<sub>s</sub> layer (E<sub>sb</sub>) over the equatorial region during the peculiar minimum of solar cycle 24