Effects of annular solar eclipse of 15 January 2010 on meteorological parameters in the 0 to 65 km region over Thumba, India

Namboodiri, Krishnan; Dileep, P. K.; Mammen, Koshy; Ramkumar, Geetha; Kumar, Nishant; Sreenivasan, S. V.; Kumar, B. Suneel; Manchanda, R. K.

doi:10.1127/0941-2948/2011/0253

Cited by 13 publications

(14 citation statements)

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“…[2,5–7]). By contrast, Eaton et al [8] did not observe changes in wind components that exceeded natural variability, although a reduction in the variance of the wind speed was observed.…”

Section: Introductionmentioning

confidence: 99%

“…A reduction in surface wind speed during eclipse events has commonly been reported and related to the characteristic stabilization of the near-surface boundary layer that occurs after sunset (e.g. [ 2 , 5 – 7 ]). By contrast, Eaton et al [ 8 ] did not observe changes in wind components that exceeded natural variability, although a reduction in the variance of the wind speed was observed.…”

Section: Introductionmentioning

confidence: 99%

“…As described by Alpin et al [ 2 ], some evidence consistent with the existence of of ‘eclipse cyclone’ has been described by several observational and modelling studies [ 14 – 16 ]. Other studies have also reported wind direction changes during eclipse events [ 5 , 6 , 17 ] but attributed them to synoptic evolution and/or local changes in mesoscale circulations such as sea breezes or mountain slope flows.…”

Section: Introductionmentioning

confidence: 99%

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Eclipse-induced wind changes over the British Isles on the 20 March 2015

Gray¹,

Harrison²

2016

Phil. Trans. R. Soc. A.

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The British Isles benefits from dense meteorological observation networks, enabling insights into the still-unresolved effects of solar eclipse events on the near-surface wind field. The near-surface effects of the solar eclipse of 20 March 2015 are derived through comparison of output from the Met Office’s operational weather forecast model (which is ignorant of the eclipse) with data from two meteorological networks: the Met Office’s land surface station (MIDAS) network and a roadside measurement network operated by Vaisala. Synoptic-evolution relative calculations reveal the cooling and increase in relative humidity almost universally attributed to eclipse events. In addition, a slackening of wind speeds by up to about 2 knots in already weak winds and backing in wind direction of about 20° under clear skies across middle England are attributed to the eclipse event. The slackening of wind speed is consistent with the previously reported boundary layer stabilization during eclipse events. Wind direction changes have previously been attributed to a large-scale ‘eclipse-induced cold-cored cyclone’, mountain slope flows, and changes in the strength of sea breezes. A new explanation is proposed here by analogy with nocturnal wind changes at sunset and shown to predict direction changes consistent with those observed.This article is part of the themed issue ‘Atmospheric effects of solar eclipses stimulated by the 2015 UK eclipse’.

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“…[2,5–7]). By contrast, Eaton et al [8] did not observe changes in wind components that exceeded natural variability, although a reduction in the variance of the wind speed was observed.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eclipse-induced wind changes over the British Isles on the 20 March 2015

Gray¹,

Harrison²

2016

Phil. Trans. R. Soc. A.

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“…An absence of large and rapid fluctuations, however, is nonetheless desirable for estimates based on single reference days to be meaningful. While solar radiation at the earth's surface is subject to some variability due to short-term variations in aerosol optical depth 46 , the impact of an eclipse is quantitatively much larger and can therefore be estimated fairly accurately (as long as clouds do not complicate the picture) 28,40,[47][48][49] .…”

Section: Introductionmentioning

confidence: 99%

Regression-based Gap-filling Methods Show Air Temperature Reductions and Wind Pattern Changes During the 2019 Total Eclipse in Chile

Hammann¹,

MacDonell²

2021

Preprint

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Singular disruptive events like solar eclipses affect the measured values of meteorological variables at the earth’s surface. To quantify such an impact, it is necessary to estimate what value the parameter would have taken had the event not occurred. We design and compare several methods to perform such an estimate based on longer observational timeseries from individual meteorological surface stations. Our methods are based on regularized regressions (including a Bayesian variant) and provide both a point an associated error estimate of the disruptive event’s impact. With their help, we study the effect of the total solar eclipse of July 2 nd , 2019, in the Coquimbo Region of Chile, on near-surface air temperatures and winds. The observational data used have been collected by the meteorological surface station network of the Centro de Estudios Avanzados en Zonas Áridas (CEAZA). Most stations inside the eclipse’s umbra registered a temperature drop of 1-2 • C, while the most extreme estimated temperature drop surpassed 6 • C. The presence of an ‘eclipse cyclone’ can neither be proven nor refuted. Application of the regression methods to other, comparable problems, like volcanic eruptions, forest fires or simply gap filling of observational data, are conceivable.

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“…Biltoft [35] reported that frictional velocity and cannot be properly defined if momentum flux is positive, even though these equations will produce what appears to be a mathematically correct result. As a convention, during the incidence of positive momentum flux, the * values are reported as negative values [36]. Mathematically positive momentum flux has to generate a negative Reynolds stress term and hence negative * and values.…”

Section: Data Validation Through Symmetries and Distributions In Mesomentioning

confidence: 99%

Coastal Boundary Layer Characteristics of Wind, Turbulence, and Surface Roughness Parameter over the Thumba Equatorial Rocket Launching Station, India

Namboodiri

Krishnan

Nileshwar

et al. 2014

Journal of Climatology

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The study discusses the features of wind, turbulence, and surface roughness parameter over the coastal boundary layer of the Peninsular Indian Station, Thumba Equatorial Rocket Launching Station (TERLS). Every 5 min measurements from an ultrasonic anemometer at 3.3 m agl from May 2007 to December 2012 are used for this work. Symmetries in mesoscale turbulence, stress off-wind angle computations, structure of scalar wind, resultant wind direction, momentum flux ( ), Obukhov length ( ), frictional velocity ( * ), w-component, turbulent heat flux ( ), drag coefficient ( ), turbulent intensities, standard deviation of wind directions ( ), wind steadiness factor-relationship, bivariate normal distribution (BND) wind model, surface roughness parameter ( 0 ), 0 and wind direction ( ) relationship, and variation of 0 with the Indian South West monsoon activity are discussed.

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Effects of annular solar eclipse of 15 January 2010 on meteorological parameters in the 0 to 65 km region over Thumba, India

Cited by 13 publications

References 0 publications

Eclipse-induced wind changes over the British Isles on the 20 March 2015

Eclipse-induced wind changes over the British Isles on the 20 March 2015

Regression-based Gap-filling Methods Show Air Temperature Reductions and Wind Pattern Changes During the 2019 Total Eclipse in Chile

Coastal Boundary Layer Characteristics of Wind, Turbulence, and Surface Roughness Parameter over the Thumba Equatorial Rocket Launching Station, India

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