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Angels Don’t play this H.A.A.R.P.

There's a fun word play in that title.

From the article:

These transmitters act as heaters that excite the gasses in the upper atmosphere. When the gasses “de-excite,” they produce an airglow between 120 and 150 miles above ground, according to a notice about the project issued by the HAARP team.

Now you take the double A: there's a letter for that:

Å
C5 (dec. 197)
LATIN CAPITAL LETTER A WITH RING ABOVE

Similarly styled trademarks
The logo of the Major League Baseball team known as the Los Angeles Angels is a capital "A" with a halo. Due to the resemblance, some Angels fans stylize the name as "Ångels".

Also on that [Wikipedia] link:

The letter "Å" (U+00C5) is also used throughout the world as the international symbol for the non-SI unit ångström, a physical unit of length named after the Swedish physicist Anders Jonas Ångström. It is always upper case in this context (symbols for units named after persons are generally upper-case). The ångström is a unit of length equal to 10−10 m (one ten-billionth of a meter) or 0.1 nm.

Which leads me over to the "airglow" link I put in the initial post:

History
The airglow phenomenon was first identified in 1868 by Swedish physicist Anders Ångström.

Coincidence? 🤓

HÅRP😉