In the red shadow of the Earth

Autoria(s): Hughes, Stephen W.; Hosokawa, Kazuyuki; Carroll, Joshua; Sawell, David; Wilson, Colin
Data(s)

01/11/2015
Resumo

A technique is described for calculating the brightness of the atmosphere of the Earth that shines into the Earth’s umbra during a total lunar eclipse making the Moon red. This ‘Rim of Fire’ is due to refracted un scattered light from all the sunrises and sunsets rimming the Earth. In this article, a photograph of the totally eclipsed Moon was compared with the Full Moon and the difference in brightness calculated taking into account the exposure time and ISO setting. The results show that the Full Moon is over 14 000 times brighter than the totally eclipsed Moon. The relative brightness of the eclipsed Moon can be used to estimate that the luminance of Rim of Fire is over 12 trillion watts. The experiment described in this paper would be suitable as a high school or university exercise.
Formato

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Identificador

http://eprints.qut.edu.au/90088/
Publicador

Institute of Physics
Relação

http://eprints.qut.edu.au/90088/1/In%20the%20red%20shadow%20of%20the%20Earth%20eprints.pdf

http://eprints.qut.edu.au/90088/2/15%20April%202014%20red%20moon.JPG

http://eprints.qut.edu.au/90088/3/15%20April%202014%20full%20moon.JPG

http://eprints.qut.edu.au/90088/6/8%20October%202014%20red%20moon.JPG

http://eprints.qut.edu.au/90088/7/8%20October%202014%20full%20moon.JPG

http://eprints.qut.edu.au/90088/4/15%20Apr%2014%20moon.roi

http://eprints.qut.edu.au/90088/5/15%20Apr%2014%20sky.roi

http://eprints.qut.edu.au/90088/8/8%20Oct%2014%20full%20moon.roi

http://eprints.qut.edu.au/90088/9/8%20Oct%2014%20full%20sky.roi

DOI:10.1088/0031-9120/50/6/741

Hughes, Stephen W., Hosokawa, Kazuyuki, Carroll, Joshua, Sawell, David, & Wilson, Colin (2015) In the red shadow of the Earth. Physics Education, 50(6), pp. 741-749.
Direitos

Copyright 2015 IOP Publishing Ltd
Fonte

School of Chemistry, Physics & Mechanical Engineering; Institute for Future Environments; Science & Engineering Faculty
Palavras-Chave #130212 Science Technology and Engineering Curriculum and Pedagogy #moon #lunar eclipse #blood moons #umbra #penumbra #rim of fire #refraction #sunset #atmospheric scattering #red sunsets #syszygy
Tipo

Journal Article
Acesso ao item digital