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The Space Reporter

Mars’ position will limit communication from Earth

17 Jul 2017, 10:29 UTC
Mars’ position will limit communication from Earth
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NASA will suspend uploading of commands to its two Mars rovers and three Mars orbiters between July 22 and August 1, when the Red Planet will be in solar conjunction, putting it almost directly behind the Sun.
This alignment occurs every 26 months. Communications sent from Earth to Mars during these times become degraded because hot, ionized gas from Sun’s corona, which stretches quite far from the Sun’s surface, interferes with radio waves that pass through the corona.
Such interference can cause commands uploaded to rovers and orbiters to become corrupted, potentially harming the vehicles if carried out.
“Out of caution, we won’t talk to our Mars assets during that period because we expect significant degradation in the communication link, and we don’t want to take a chance that one of our spacecraft would act on a corrupted command,” explained Chad Edwards, who manages the Mars Relay Network Office at NASA’s Jet Propulsion Laboratory (JPL) in California.
The potential for communications being corrupted during this time is strong in spite of the fact that Mars usually does not pass directly behind the Sun during solar conjunctions.
As a precautionary measure, the suspension of all communications to Mars rovers and orbiters ...

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