Investigation of ionospheric absorption at Delhi

Rao, M. K.; Mazumdar, S.; Mitra, S.

doi:10.1016/0021-9169(62)90095-8

Cited by 14 publications

(1 citation statement)

References 5 publications

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“…The theoretical studies have been associated with numerous investigations on actual measurements [ 11 ], especially as regards dependency on frequency and season [ 12 , 13 ]. Particular interest has been paid to the D, E, and sporadic-E layers [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Calibrating an Ionosonde for Ionospheric Attenuation Measurements

Gilli

Sciacca

Zuccheretti

2018

Sensors

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Vertical ionospheric soundings have been performed at almost all ionospheric observatories with little attention to measuring the attenuation of the signal between transmission and reception. When the absorption has been determined, this has been achieved by comparing the received power after the first and second reflections, but this method has some limitations due to the unknown reflection coefficient of the ground and the non-continuous presence of the second reflection. This paper deals with a different method based on precise calibration of the sounding system, allowing determination of absolute signal attenuation after a single reflection. This approach is affected by a systematic error due to imperfect calibration of the antennas, but when the focus of interest is to measure a trend over a specified period, it is very accurate. The article describes how calibration was implemented, the measurement output formats, and finally it presents some results from a meaningful set of measurements in order to demonstrate what this method can accomplish.

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