A comparison between ground-based observations of noctilucent clouds and Aura satellite data

Dalin, Peter; Pertsev, N. N.; Dubietis, A.; Zalcik, Mark; Zadorozhny, A. M.; Connors, Martin; Schofield, Ian; McEwan, Tom; McEachran, I.; Frandsen, S.; Hansen, O.; Andersen, Henrik L.; Sukhodoev, V. A.; Perminov, V. I.; Balčiūnas, Ričardas; Romejko, V.

doi:10.1016/j.jastp.2011.01.020

Cited by 21 publications

(14 citation statements)

References 32 publications

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“…However, few above-frostpoint NLC observations should be pointed out, and further studies are necessary to unveil if these observations are of real geophysical origin or just related to uncertainties in temperature measurements. Extension of these studies with regard to broader geographical coverage, opens an interesting research line for the nearest future (Dalin et al, 2010b).…”

Section: Discussionmentioning

confidence: 98%

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Observations of noctilucent clouds from Lithuania

Dubietis

Dalin

Balčiūnas³

et al. 2010

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Discussionmentioning

confidence: 98%

“…The estimation of the frost point temperature was based on a formula presented by Gadsden and Schröder (1989). The detailed comparison of the MLS data and NLC observations around the globe is presented by Dalin et al (2010b).…”

Section: Period Of Visibilitymentioning

confidence: 99%

Observations of noctilucent clouds from Lithuania

Dubietis

Dalin

Balčiūnas³

et al. 2010

Journal of Atmospheric and Solar-Terrestrial Physics

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“…In particular, it was emphasized by Dalin et al . [] that “…we always observe gravity waves of small and medium scales, and often of large scales when NLCs appear. These waves highly modulate the brightness and morphology of noctilucent clouds during the period of visibility.”…”

Section: Discussionmentioning

confidence: 99%

Optical studies of rocket exhaust trails and artificial noctilucent clouds produced by Soyuz rocket launches

et al. 2013

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[1] Detailed tracing of an exhaust plume from a rocket's initial trajectory is a scientifically and diagnostically useful technique. It can provide detailed information on the atmosphere's mean winds, wind shears, turbulent regime, and physical state over a wide altitude range from 50 to 200 km. We analyze Soyuz rocket exhaust plumes from Plesetsk on 21 May 2009 and 27 June 2011, which uncovered significantly different atmospheric states and underlying dynamics. The first case showed highly dynamical conditions in the mesosphere, characterized by vortex structures, wind shears, and small-scale turbulent eddies. The estimated turbulent energy dissipation rates ranged 330-460 mW kg À1. A characteristic balloon-shaped trail was observed at altitudes between 105 and 160 km, having rapid expansion rates of 500-800 m s À1 over the time period of 2 min which can be explained by complex gas dynamic processes in the rocket wake involving the collision of shock waves. In the second case, we show evidence that the rocket exhaust trail persisted without any changes during its motion from Plesetsk via Denmark to the UK for 9 h, indicating extremely stable atmospheric conditions. This case introduces a new state of the summer mesosphere-remarkably quiet conditions, probably never observed before. The rocket plumes studied, related to the initial rocket trajectory, are essentially twilight phenomena as seen from the ground using wideband spectrum cameras, that is, the Sun should be below the horizon by 6°. For the first time, we analyze the dynamics of rocket exhaust products at the initial trajectory in the mesosphere and lower thermosphere using detailed photographic imaging taken from the ground.Citation: Dalin, P., et al. (2013), Optical studies of rocket exhaust trails and artificial noctilucent clouds produced by Soyuz rocket launches,

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“…Indeed, formation of NLCs has been related to extremely low temperature around the summer mesopause [11], and recent results that combine ground-based photographic NLC observations by a digital camera network and satellite data confirm this relationship in great detail [12]. It is now clear that NLCs form when the temperature falls below the frost point temperature of water vapor.…”

Section: Noctilucent Cloud Formationmentioning

confidence: 95%

“…More recently, the observed variations of NLC parameters were compared to temperature variations at the mesopause height, as measured by NASA's Aura satellite. It was shown that the 2-and 5-day planetary wave activity and NLC brightness are in anticorrelation: NLC brightness is amplified at the cold phase of the wave and vice versa, and this behavior is reliably established from each network site [12]. The impact of 16-day planetary wave activity seems more complicated and should be further studied; it is possible that this kind of wave is responsible, to some extent, for variations of the overall seasonal NLC climatology, e.g., time of seasonal temperature minima and related variations of NLC characteristics.…”

Section: Waves In Noctilucent Cloudsmentioning

confidence: 98%

Noctilucent clouds: modern ground-based photographic observations by a digital camera network

et al. 2011

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Noctilucent, or "night-shining," clouds (NLCs) are a spectacular optical nighttime phenomenon that is very often neglected in the context of atmospheric optics. This paper gives a brief overview of current understanding of NLCs by providing a simple physical picture of their formation, relevant observational characteristics, and scientific challenges of NLC research. Modern ground-based photographic NLC observations, carried out in the framework of automated digital camera networks around the globe, are outlined. In particular, the obtained results refer to studies of single quasi-stationary waves in the NLC field. These waves exhibit specific propagation properties-high localization, robustness, and long lifetime-that are the essential requisites of solitary waves.

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A comparison between ground-based observations of noctilucent clouds and Aura satellite data

Cited by 21 publications

References 32 publications

Observations of noctilucent clouds from Lithuania

Observations of noctilucent clouds from Lithuania

Optical studies of rocket exhaust trails and artificial noctilucent clouds produced by Soyuz rocket launches

Noctilucent clouds: modern ground-based photographic observations by a digital camera network

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