Topic
Solar eclipse
About: Solar eclipse is a research topic. Over the lifetime, 2737 publications have been published within this topic receiving 22625 citations.
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TL;DR: In this article, the authors reported spatiotemporal variation in the total electron content (TEC) in ionosphere caused by the 26 December 2019 annular solar eclipse, seen over most of the Southeast Asia.
Abstract: We report spatiotemporal variation in the total electron content (TEC) in ionosphere caused by the 26 December 2019 annular solar eclipse, seen over most of the Southeast Asia. Sparsely distributed network of the Global Navigation Satellite System (GNSS) sites located on the continental parts and on islands documented the transhemispheric coellipse changes in the ionospheric electron density. A significant depletion in TEC of ~6–8 TECU (1 TECU = 1 × 1016 electrons m−2) is observed along the path of the eclipse shadow. Simulations using the SAMI3 model are consistent with the observations of TEC depletion. The model also predicted a magnetically conjugate region of marginal increased TEC of ~0.2–0.3 TECU around northern Japan and adjacent Pacific Ocean, which is also consistent with the ground-based GNSS observations in that region.
9 citations
TL;DR: In this paper, photoelectric observations of the sky brightness along Sun's meridian have been carried out at Salloum during the March 29, 2006 total solar eclipse at different zenith distances using yellow and red wide band glass filters centered at 5500 A and 7900 A, respectively.
9 citations
TL;DR: In this paper, a comparison of the eclipse effects indicated at these two places derives some of its interest from the fact that the "normal" diurnal variation of potential-gradient and that of air-conductivity at Lakin seems to be of about the same character as that found for the respective elements at Huancayo on most fair-weather days, namely, values of airconductivity are conspicuously larger at night than in daylight, while the values of potential gradient are larger in daylight and small at night.
Abstract: The correlation, reported by Jones and Giesecke, between certain variations in atmospheric-electric elements, and the progress of the solar eclipse, appears to be more significant than any seen by the writer, in similar observations made elsewhere during solar eclipses [see 1, 2, 3, 4 of “References” at end of paper] except the observations [1] made at Lakin, Kansas, during the eclipse of June 8, 1918, which show effects that appear to have about the same significance. A comparison of the eclipse-effects indicated at these two places derives some of its interest from the fact that the “normal” diurnal variation of potential-gradient and that of air-conductivity at Lakin seems to be of about the same character as that found for the respective elements at Huancayo on most fair-weather days, namely, values of air-conductivity are conspicuously larger at night than in daylight, while the values of potential gradient are larger in daylight and small at night and at both places the diurnal variation of air-earth current is apparently free from this local time-component. Although the data bearing on diurnal variation, obtained at Lakin, Kansas, consist of manual observations for one 24-hour period only, confidence in the indicated character of diurnal variation is strengthened by the fact that the four independently measured elements, namely, potential-gradient, positive conductivity, negative conductivity, and positive ion-concentration, all show the pronounced and consistent difference between daylight and night.
Meteorological conditions reported for the period of observations at Lakin are favorable for the development there of a stable stratum of air adjacent to the Earth at night. The latter is an important feature in the mechanism proposed by the writer [5] to explain the remarkable local aspect of diurnal variation in the several elements at Huancayo and it accordingly seems likely that the diurnal variation observed at Lakin is also attributable to such a mechanism. One may therefore expect an eclipse of the Sun to affect the atmospheric-electric elements in a similar manner at the two places, namely, tend to establish, during the eclipse, values which are characteristic of night.
9 citations
TL;DR: In this paper, it is shown that the variations in the recorded atmospheric electric variables and in the spectral decay exponent are consistent with a strong diminution of turbulence near the ground as the Sun is obscured and the establishment of a thin layer above the ground in which a higher than normal density of small ions is produced by surface radioactivity.
9 citations
TL;DR: In this paper, the authors presented results of optical observations and analysis of dynamics of effects on the earth's lower atmosphere of the partial solar eclipse (of magnitude 42%) of August 1, 2008, near Kharkov This is compared with the effects induced by partial solar eclipses on August 11, 1999 and October 3, 2005 All three eclipses occurred around midday.
Abstract: The paper presents results of optical observations and analysis of dynamics of effects on the earth’s lower atmosphere of the partial solar eclipse (of magnitude 42%) of August 1, 2008, near Kharkov This is compared with the effects induced by the partial solar eclipses on August 11, 1999, and October 3, 2005 All three eclipses occurred around midday The standard deviation of the solar-limb displacement σ
S
during the eclipses on October 3, 2005, August 1, 2008, and August 11, 1999, was established to decrease by 013, 030, and 068″ at the maximum of the solar obscuration function 013, 031, and 073, respectively, so that the temperature drop in the earth’s lower atmosphere t
a
was 13, 20, and 73 K The time lags of decreases of σ
S
and t
a
was found to be 15 and 5 minutes
9 citations