Dayglow photometry: a new approach

Narayanan, R.; Desai, J. N.; Modi, Nishant; Raghavarao, R.; Sridharan, R.

doi:10.1364/ao.28.002138

Cited by 34 publications

(13 citation statements)

References 7 publications

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“…In this arrangement, the scattered solar background contribution is significantly reduced by the first FP interferometer and the second or the third one is scanned to optimize the emission features. Daytime optical photometers were developed using a lowresolution FP interferometer as a high spectral resolution optical filter with a unique combination of stationary and rotating mask arrangement (Narayanan et al, 1989;Sridharan et al, 1998). These photometers yielded several interesting results on the low-and high-latitude Aeronomy (e.g., Pallam Raju et al, 1995Raju et al, , 1996Pallam Raju and Sridharan, 1998;Sridharan et al, 1992Sridharan et al, , 1994Sridharan et al, , 1999.…”

Section: Techniques Employed For Ground-based Daytime Measurementsmentioning

confidence: 99%

Contributions of imaging Echelle spectrographs to daytime optical aeronomy

Pallamraju

Chakrabarti

2006

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Techniques Employed For Ground-based Daytime Measurementsmentioning

confidence: 99%

Contributions of imaging Echelle spectrographs to daytime optical aeronomy

Pallamraju

Chakrabarti

2006

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Ground-based daytime observations are more recent because of detection problems due to the presence of a high solar background against a faint dayglow emission. The first studies were made possible with the development of dayglow photometers (DGP) (Narayanan et al, 1989) and multi-wavelength daytime photometers (MWDPM) (Sridharan et al, 1998). In a very recent paper, Taori et al (2003) discussed simultaneous groundbased observations of red and green dayglow and outlined the significant importance of the thermospheric contribution to the 557.7 nm emission, as already shown by rocket and satellite measurements.…”

Section: Introductionmentioning

confidence: 97%

The OI 630.0 and 557.7nm dayglow measured by WINDII and modeled by TRANSCAR

Culot¹,

Lathuillére²,

Lilensten³

et al. 2004

Ann. Geophys.

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Abstract. A 1-D fluid/kinetic code is used to model WIND Imaging Interferometer measurements of the atomic oxygen ( 3 P-1 D) red and ( 1 D-1 S) green thermospheric dayglows at 630.0 nm and 557.7 nm. This modelling is performed for different latitude and solar zenith angle conditions, in order to reproduce the measurements all along the satellite orbit. Results are successfully compared to the interferometer's observations, reproducing the measured volume emission rates, together with the maximum emission altitude. A good agreement is found regardless of the position considered along the satellite orbit, meaning that the solar flux and the solar zenith angle influences were successfully taken into account. Together with this model study, a four-year red and green oxygen lines set of WINDII data is analysed with regards to those geophysical parameters. Correlations between volume emission rates and solar flux are evaluated and it is found that the MgI I index is better suited to this kind of study than the f 10.7 decimetric index.

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“…A few methods have been put forth in the past (e.g. Narayanan et al, 1989;Sridharan et al, 1993bSridharan et al, , 1998Chakrabarti et al, 2001;Pallamraju et al, 2002Pallamraju et al, , 2013Gerard and Meriwether, 2011) to measure these emission intensities, which used low-and high-resolution Fabry-Pérot etalons, echelle and normal gratings, with varying fields of view.…”

Section: Oxygen Dayglow Emissionsmentioning

confidence: 99%

Electrodynamic influence on the diurnal behaviour of neutral daytime airglow emissions

et al. 2016

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Abstract. The diurnal variations in daytime airglow emission intensity measurements at three wavelengths OI 777.4 nm, OI 630.0 nm, and OI 557.7 nm made from a low-latitude location, Hyderabad (17.5 • N, 78.4 • E; 8.9 • N MLAT) in India have been investigated. The intensity patterns showed both symmetric and asymmetric behaviour in their respective diurnal emission variability with respect to local noon. The asymmetric diurnal behaviour is not expected considering the photochemical nature of the production mechanisms. The reason for this observed asymmetric diurnal behaviour has been found to be predominantly the temporal variation in the equatorial electrodynamics. The plasma that is transported across latitudes due to the action of varying electric field strengths over the magnetic equator in the daytime contributes to the asymmetric diurnal behaviour in the neutral daytime airglow emissions. Independent magnetic and radio measurements support this finding. It is also noted that this asymmetric diurnal behaviour in the neutral emission intensities has a solar cycle dependence with a greater number of days during high solar activity period showing asymmetric diurnal behaviour compared to those during a low solar activity epoch. These intensity variations over a long timescale demonstrate that the daytime neutral optical emissions are extremely sensitive to the changes in the eastward electric field over low and equatorial latitudes.

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Dayglow photometry: a new approach

Cited by 34 publications

References 7 publications

Contributions of imaging Echelle spectrographs to daytime optical aeronomy

Contributions of imaging Echelle spectrographs to daytime optical aeronomy

The OI 630.0 and 557.7nm dayglow measured by WINDII and modeled by TRANSCAR

Electrodynamic influence on the diurnal behaviour of neutral daytime airglow emissions

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