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it's 13,000 feet above sea level, outside most of the earth's atmosphere

"Most" is a stretch. The standard atmosphere calculator says 13,000 ft is above 1/3 of the mass of the atmosphere and below 2/3 - i.e., the density is reduced to 56% that at sea level.

I can't comprehend that size

Don't complain, calculate, and then post for the similarly challenged.

5000 miles = 8046.72 Km

Per the Article, this will be able to generate 200,000 electron volts (eV).

1 wattsecond (Ws) = 6,241,457,005,723,417,000 eV (http://www.digitaldutch.com/unitconverter/)

That says 6 Quintillion* eV to generate 1 Watt of energy for 1 second.

Not much energy in this form, and as stated before it is not self-sustaining.

* http://www.kokogiak.com/megapenny/eighteen.asp

For what it's worth, the temperature at 65kft, according to the 1976 Standard Atmosphere, is -70 F (the 4-degree per 1 kft doesn't hold all the way up because there is a temperature inversion between 10 kft and 45 kft).

I'm not sure about the upper limit on 200 kts for the winds aloft, but you should state the winds can be from -200 kts to +200 kts because it makes a big difference for an airplane whether it is going into a headwind or not.

The aerodynamic force goes as the density times the square of the velocity. At 65kft the density drops from 1.225 kg/m3 to 0.0907 kg/m3, so all other things equal (namely the area of the wing), to maintain the same lift you need to increase your relative velocity about four times, so your 60 kts becomes 240 kts. As an example, the SR-71 has a takeoff speed of 334 kph, so to fly at 85kft (density 0.0342 kg/m3) it needs to fly at least 2000 kph just to stay aloft (and in fact the link I provided says it can go over 3500 kph!).

from here, 1 sq meter = 1550 sq inches.
1470W/m^2~0.95w/inch^2

Maybe because they absorb a huge amount of photons giving a very large current which makes up the power?

To convert between different units, WWW Unit Conveerter is your friend.

Sorry for the non-US compliant unit "bar". Here is an online unit converter... 2100bar = ca 30457psi, it says...