scholarly journals Solar limb darkening function and solar diameter with eclipse observations

2012 ◽  
Vol 55 ◽  
pp. 389-391
Author(s):  
A. Raponi ◽  
C. Sigismondi ◽  
K. Guhl ◽  
R. Nugent ◽  
A. Tegtmeier
Keyword(s):  
Solar Limb ◽  
Solar Diameter ◽  
Eclipse Observations ◽  
Limb Darkening

scholarly journals The Measurement of Solar Diameter and Limb Darkening Function with the Eclipse Observations

Solar Physics ◽  
2012 ◽  
Vol 278 (2) ◽  
pp. 269-283 ◽  
Author(s):  
A. Raponi ◽  
C. Sigismondi ◽  
K. Guhl ◽  
R. Nugent ◽  
A. Tegtmeier
Keyword(s):  
Solar Diameter ◽  
Eclipse Observations ◽  
Limb Darkening

scholarly journals ECLIPSES, SOLAR LIMB DARKENING FUNCTION AND DIAMETER MEASUREMENTS: TOWARD A UNIFIED APPROACH

2013 ◽  
Vol 23 ◽  
pp. 432-436
Author(s):  
ANDREA RAPONI ◽  
COSTANTINO SIGISMONDI ◽  
KONRAD GUHL ◽  
RICHARD NUGENT ◽  
ANDREAS TEGTMEIER
Keyword(s):  
General Relativity ◽  
High Resolution ◽  
Solar Limb ◽  
Solar Radius ◽  
Inflexion Point ◽  
Unified Approach ◽  
Tests Of General Relativity ◽  
Solar Diameter ◽  
Limb Darkening ◽  
Over Time

In order to perform high resolution astrometry of the solar diameter from the ground, through the observations of eclipses, the study of the limb darkening profile is described. Knowing the profile of the solar limb is useful both to monitor the solar radius over time, and to define the oblateness, which is interesting for the classical tests of general relativity. The Limb Darkening Function (LDF) is studied in order to find the inflexion point, to which the measurements of the solar diameter are referred. The proposed method is applied to the videos of the annular eclipse in January, 15, 2010. This new method might solve the ambiguity of some eclipse obervations made with different instruments, where the measured solar diameter was clearly dependent on the aperture of the telescope and on the density of the filter used.

MEASURING SOLAR DIAMETER WITH 2012 VENUS TRANSITS

2013 ◽  
Vol 23 ◽  
pp. 451-453 ◽  
Author(s):  
COSTANTINO SIGISMONDI
Keyword(s):  
Past History ◽  
Logarithmic Derivative ◽  
Solar Limb ◽  
Absolute Calibration ◽  
The Sun ◽  
Solar Diameter ◽  
The Past ◽  
History Of ◽  
Better Than

The role of Venus and Mercury transits is crucial to know the past history of the solar diameter. Through the W parameter, the logarithmic derivative of the radius with respect to the luminosity, the past values of the solar luminosity can be recovered. The black drop phenomenon affects the evaluation of the instants of internal and external contacts between the planetary disk and the solar limb. With these observed instants compared with the ephemerides the value of the solar diameter is recovered. The black drop and seeing effects are overcome with two fitting circles, to Venus and to the Sun, drawn in the undistorted part of the image. The corrections of ephemerides due to the atmospheric refraction will also be taken into account. The forthcoming transit of Venus will allow an accuracy on the diameter of the Sun better than 0.01 arcsec, with good images of the ingress and of the egress taken each second. Chinese solar observatories are in the optimal conditions to obtain valuable data for the measurement of the solar diameter with the Venus transit of 5/6 June 2012 with an unprecedented accuracy, and with absolute calibration given by the ephemerides.

Observations of Solar Limb Darkening Between 0.5 and 10.2μ

1950 ◽  
Vol 112 ◽  
pp. 289 ◽  
Author(s):  
A. K. Pierce ◽  
R. R. McMath ◽  
Leo Goldberg ◽  
O. C. Mohler
Keyword(s):  
Solar Limb ◽  
Limb Darkening

Solar Limb Darkening Near λ 6563 from 0.9 to 1.00 R.

1959 ◽  
Vol 130 ◽  
pp. 972 ◽  
Author(s):  
Richard B. Dunn
Keyword(s):  
Solar Limb ◽  
Limb Darkening

scholarly journals Observation of Global 160-min Infrared (Differential) Intensity Variation of the Sun

1983 ◽  
Vol 66 ◽  
pp. 21-35
Author(s):  
V.A. Kotov ◽  
S. Koutchmy ◽  
O. Koutchmy
Keyword(s):  
Low Frequency ◽  
Intensity Variation ◽  
Solar Limb ◽  
The Sun ◽  
Average Amplitude ◽  
Instrument Analysis ◽  
Limb Intensity ◽  
Limb Darkening ◽  
Global Fluctuations ◽  
Made In

AbstractThe method developed and the instrument designed for detecting variations of the solar limb darkening at the atmospheric transparency window of the solar opacity minimum region of λ 1.65 µ are described. This differential technique proved to be successful in rejecting undesirable low frequency noises due to the atmosphere and to the instrument. Analysis of observations made in 1977, 1978, and 1981 indicates the persistance of global fluctuations of the IR differential, center-to-limb intensity at the wellknown 160 min period with an average amplitude of about ± 2 x 10-4 in units of the ‘average Sun’ intensity near 1.65 µm.

Solar limb darkening

Solar Physics ◽  
1977 ◽  
Vol 51 (1) ◽  
Author(s):  
A.Keith Pierce ◽  
CharlesD. Slaughter
Keyword(s):  
Solar Limb ◽  
Limb Darkening
Sign in / Sign up

Export Citation Format

Share Document