File:Conjunction ESA382897.jpg
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Captions
Summary
[edit]DescriptionConjunction ESA382897.jpg |
English: Artist's impression of radio sounding of the solar corona with Mars Express
This illustration shows how radio transmissions from planetary missions can be employed to study the corona of the Sun. This technique can be performed on rare occasions, when a spacecraft is located at superior solar conjunction – meaning that Earth, Sun and the spacecraft lie on the same line, with the spacecraft located on the opposite side of the Sun with respect to our planet. In the illustration, Mars is in superior conjunction and radio signals sent out by Mars Express, ESA's mission in orbit around the Red Planet, pass through the solar environment as they travel towards Earth. Along their path, the radio signals encounter the corona, the hot outer atmosphere of the Sun, which consists of turbulent plasma at temperatures of millions of degrees. Electrons in the coronal plasma interact with the radio signals, causing a frequency shift that can be measured on Earth and analysed to infer the electron density in the corona. Radio sounding measurements of the solar corona were performed with Mars Express during the conjunctions of Mars in 2004, 2006 and 2008. This technique complements direct imaging of the corona in visible light. |
Date | |
Source | http://www.esa.int/spaceinimages/Images/2017/08/Conjunction |
Author | European Space Agency |
Permission (Reusing this file) |
ESA/AOES Medialab,CC BY-SA 3.0 IGO |
Title InfoField | Conjunction |
System InfoField | ESTRACK |
Mission InfoField | ExoMars |
Activity InfoField | Operations |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:55, 25 August 2017 | 1,280 × 1,024 (263 KB) | Fæ (talk | contribs) | European Space Agency, Id 382897, http://www.esa.int/spaceinimages/Images/2017/08/Conjunction, User:Fæ/Project_list/ESA |
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Orientation | Normal |
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Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS4 Windows |
File change date and time | 15:24, 20 July 2012 |
Color space | Uncalibrated |
Image width | 1,280 px |
Image height | 1,024 px |
Date and time of digitizing | 14:29, 17 July 2012 |
Date metadata was last modified | 17:24, 20 July 2012 |
Unique ID of original document | xmp.did:EFD40EBC10D0E1118C8BE295A7BC3CD4 |