Solar eclipse

About: Solar eclipse is a research topic. Over the lifetime, 2737 publications have been published within this topic receiving 22625 citations.

Meteorological effects of the solar eclipse of 11 August 1999

Abstract: A rare and spectacular total solar eclipse crossed the south-west tip of Britain, sweeping swiftly onwards into continental Europe, during the late morning of 11 August 1999 (Fig. 1). (The last total solar eclipse in the UK barely clipped Shetland in 1954, and the next will not occur until 2081, in the Channel Islands.) The rest of the country was subjected to a deep partial eclipse. For most of Britain, the eclipse lasted from about 1000 to 1235 BST, with maximum obscuration of the Sun by the Moon between about 1112 and 1122BST, exact timings being later further east (Bell 1997). Unfortunately the surface pressure analysis (Fig. 2) shows a weak low approaching Ireland, with an associated cloudy trough hitting the south-west peninsula just at the crucial hour when avid eclipse watchers could well have done without this nuisance! Ahead of the front, winds were light in a slack south or south-east airflow resulting from a weak transient ridge. Cloud conditions further east and north in Britain were still patchy but generally clearer (Fig. zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA3). While many of the south coast resorts east of the Isle of Wight had largely clear skies, with typically 7 or 8 hours of bright sunshine, those further west were mainly cloudy with only an hour or less of sunshine.

Fluctuation in ozone column over Ahmedabad during the solar eclipse of 24 October 1995

Abstract: A solar eclipse occurred over Ahmedabad, India (23°N, 72°E) on 24 October 1995. We measured the vertical column abundance of ozone during this event using a Dobson spectrophotometer. We found that a sharp fall in the ozone column began from its normal value ∼15 minutes before the maximum obscuration (MO) of the sun, followed by a sharp rise ∼10 minutes after the MO. About 15 minutes after the MO, ozone column returned to normal values, but a wavelike fluctuation was still seen.

Micrometeorological measurements during the total solar eclipse of August 11, 1999

Abstract: Micrometeorological measurements of radiation, atmospheric and soil parameters, and turbulent energy and momentum e uxes, ozone and carbon dioxide e uxes have been conducted over a maize e eld at FreisingWeihenstephan in Southern Germany during the total solar eclipse on August 11, 1999. For the period 30 minutes before and after the totality the weather conditions at the location where the micrometeorological measurements were made was satisfactory. Several connections between the irradiation and other meteorological parameters over a maize e eld have been found. The time response between irradiation and the long-wave upward radiation was only a few minutes, whereas almost all parameters caused by the turbulent transport had a time shift of up to 30 minutes. A period of nearly 30 minutes with reduced turbulence regime after the totality was found. Using a wavelet transformation for the time series, a change of time scales from longer to shorter ones was observed before the totality, and after the turbulence increased in the short time scales. The investigation of the residuum of the closure of the energy balance showed that with a time shift for the latent heat e ux (unlike the net radiation) after the totality, a better energy budget closure was obtained.

Response of Atmospheric Surface Layer Turbulence to a Partial Solar Eclipse

Abstract: Measurements of velocity and temperature fluctuations were made over a period including a solar eclipse of 80% totality to determine the _response of surface layer to the change in ground heat flux. The response of the rms velocity fluctuation lags behind that of the rms temperature fluctuation by about 20 min. Although the velocity spectrum exhibits a good inertial subrange for the whole period of observation, the inertial subrange in the temperature spectrum disappears shortly after the start of the eclipse. It is found that during the eclipse the surface layer turbulence approximately follows a continuum of equilibrium states in response to stability changes brought about by the change in surface heat flux.