A multiwavelength daytime photometer - a new tool for the investigation of atmospheric processes

Sridharan, R.; Modi, Nishant; Raju, D. Pallam; Narayanan, R.; Pant, Tarun Kumar; Taori, A.; Chakrabarty, D.

doi:10.1088/0957-0233/9/4/005

Cited by 46 publications

(33 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…Further, the presence of ®ne Fraunhofer absorption features in the solar background and the telluric absorption features in addition to the Ring eect, due to the atmospheric constituents do not aect the relative intensity measurements reported here. This aspect has been amply demonstrated experimentally and discussed extensively by Narayanan et al, (1989) and Sridharan et al, (1998). It had been shown by them that these features, if any, present in the spectral windows get smoothed out due to the large window (0.07 nm) and also due to the large ®eld of view (2±3°).…”

Section: Instrumentationmentioning

confidence: 79%

High resolution 2-D maps of OI 630.0 nm thermospheric dayglow from equatorial latitudes

Raju

Sridharan

1998

Ann. Geophys.

View full text Add to dashboard Cite

Abstract. The ®rst-ever high resolution 2-D maps of OI 630.0 nm dayglow obtained from equatorial latitudes clearly reveal the movement as a large-scale feature of the equatorial ionization anomaly (EIA). These also show the presence of wave-like features classi®ed as gravity waves presumably originating at the crest of the EIA, similar to the equatorial electrojet acting as a source of these waves. These results are presented and discussed.

show abstract

“…[6] The unique Multiwavelength Dayglow Photometer [Sridharan et al, 1998] is being operated from Trivandrum (8.5°N, 77°E; dip latitude, 0.5°N) and can measure intensities of three dayglow emissions (630.0, 731.6, and 740.2 nm) nearly simultaneously [Vineeth et al, 2005, and references therein]. As in the past the daytime OH emission intensity measurements thus obtained were used to estimate the daytime mesopause temperature following the method of Meriwether [1975Meriwether [ , 1984.…”

Section: Methodsmentioning

confidence: 99%

Planetary wave-tidal interactions over the equatorial mesosphere-lower thermosphere region and their possible implications for the equatorial electrojet

et al. 2011

View full text Add to dashboard Cite

[1] Optically measured daylight mean mesopause temperatures over a dip equatorial station, Trivandrum (8.5°N; 77°E; dip lat. 0.5°N), have been analyzed in conjunction with simultaneously measured equatorial electrojet (EEJ)-produced magnetic field at the surface. The signature of planetary wave-tidal interactions in the mesosphere-lower thermosphere (MLT) region has been observed for the first time in the day-to-day variability in the EEJ, i.e., the time of its peaking and the duration, as inferred from the EEJ-produced magnetic field on the ground. The present study shows that the planetary wave of quasi 16 day periodicity plays an important role in causing these variabilities, especially during the winter months. The quasi 16 day wave is found to be modulating the mesopause temperature (MT), duration, and time of the maximum EEJ intensity (D EEJ and T EEJ ). During positive excursions of the planetary wave, T EEJ showed a shift toward evening, while the MT showed an increase and D EEJ showed a broadening. Similarly, all these parameters exhibited an opposite trend during negative excursions. The planetary wave-tidal interactions and subsequent modification of the tidal components have been shown to be responsible for the observed variations. This study presents a new perspective addressing the day-to-day variability of the EEJ.

show abstract

A multiwavelength daytime photometer - a new tool for the investigation of atmospheric processes

Cited by 46 publications

References 14 publications

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

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

High resolution 2-D maps of OI 630.0 nm thermospheric dayglow from equatorial latitudes

Planetary wave-tidal interactions over the equatorial mesosphere-lower thermosphere region and their possible implications for the equatorial electrojet

Contact Info

Product

Resources

About