Abstract
Precipitable Water Vapour (PWV) is the amount of water vapour in the atmospheric
column above a location equivalent to the amount of liquid precipitation that would
result if all the water vapour in the column was condensed. Water vapour is the main
source of opacity in the Earth’s atmosphere at infrared and millimetre to sub-millimetre
wavelengths. The Event Horizon Telescope (EHT) is a large network of millimetre to
sub-millimetre telescopes across the globe that is used to image supermassive black
holes. The Africa Millimetre Telescope (AMT) is planned to be built on Mt Gamsberg
in Namibia and aims to complement the EHT. In this study, PWV at Mt Gamsberg
and at the H.E.S.S. site was determined in order to asses the two sites regarding their
suitability to conduct millimetre wave astronomy and for the AMT to be built on Mt
Gamsberg. PWV at the H.E.S.S. site was indirectly determined from sky temperature
data which was taken from 2004 to 2019 by radiometers on four of the H.E.S.S.
Cherenkov Telescopes (CT). The PWV at H.E.S.S. as a function of sky temperature
as given by the CT radiometers was determined by relationships given by data from
two other equipment present at the H.E.S.S. site, namely the NASA AERONET station
and an ATMOSCOPE with the equipment recording PWV and sky temperature,
respectively. The PWV at Mt Gamsberg was determined by scaling the PWV from the
H.E.S.S. site to what it would be at the height of Mt Gamsberg. The relative frequency
distribution of PWV, monthly mean PWV along with its seasonal variations were comi
puted for both sites. The presented results indicate Mt Gamsberg is a suitable site for
millimetre wave astronomy and to host the AMT. However it was recommended that
direct PWV measurements should be taken at Mt Gamsberg to confirm the result of
this study, as these were not based on direct in-situ measurements.
FRANS, L (2021). Determination Of The Suitability Of Mt Gamsberg In Namibia For Millimetre Wave Astronomy By Measurements Of The Precipitable Water Vapour. Afribary. Retrieved from https://tracking.afribary.com/works/determination-of-the-suitability-of-mt-gamsberg-in-namibia-for-millimetre-wave-astronomy-by-measurements-of-the-precipitable-water-vapour
FRANS, LOTT "Determination Of The Suitability Of Mt Gamsberg In Namibia For Millimetre Wave Astronomy By Measurements Of The Precipitable Water Vapour" Afribary. Afribary, 27 Apr. 2021, https://tracking.afribary.com/works/determination-of-the-suitability-of-mt-gamsberg-in-namibia-for-millimetre-wave-astronomy-by-measurements-of-the-precipitable-water-vapour. Accessed 14 Nov. 2024.
FRANS, LOTT . "Determination Of The Suitability Of Mt Gamsberg In Namibia For Millimetre Wave Astronomy By Measurements Of The Precipitable Water Vapour". Afribary, Afribary, 27 Apr. 2021. Web. 14 Nov. 2024. < https://tracking.afribary.com/works/determination-of-the-suitability-of-mt-gamsberg-in-namibia-for-millimetre-wave-astronomy-by-measurements-of-the-precipitable-water-vapour >.
FRANS, LOTT . "Determination Of The Suitability Of Mt Gamsberg In Namibia For Millimetre Wave Astronomy By Measurements Of The Precipitable Water Vapour" Afribary (2021). Accessed November 14, 2024. https://tracking.afribary.com/works/determination-of-the-suitability-of-mt-gamsberg-in-namibia-for-millimetre-wave-astronomy-by-measurements-of-the-precipitable-water-vapour