‰  NOW 25 WPM  ‰  TEXT IS FROM JANUARY 2017 QST  PAGE 54‰

IMMEDIATELY EVEN THOUGH THE STORM WAS JUST A FEW MILES AWAY.  THEN
SOMETHING HAPPENED THAT WAS RATHER UNEXPECTED STATIONS FROM ALL THE WORLD
WERE HEARD ON ALL THE MONITORED BANDS.  CAN THUNDERSTORMS AFFECT THE D
LAYER?  THERE ARE SEVERAL EXPLANATIONS ON HOW THIS IS POSSIBLE.  MY
FAVORITE THEORY IS THAT THE SPRITE DISCHARGE ON TOP OF THE STORM CAUSES THE
IONOSPHERE TO IONIZE.  10 METER PROPAGATION CAUSED BY NIGHTGLOW  NIGHTGLOW
ALSO KNOWN AS AIRGLOW IS A PHENOMENON THAT CAUSES A GREEN GLOW IN A DARK,
CLOUDLESS SKY.  IT LOOKS SIMILAR TO THE SOFT GREEN AURORA BOREALIS, BUT IS
MORE UNIFORM AND LACKS THE STREAMING NATURE OF AURORAS.  NIGHT GLOW IS
CAUSED BY ATOMS THAT RECOMBINE AFTER BEING PHOTO IONIZED BY UV RADIATION
FROM THE SUN DURING THE DAY.  NIGHTGLOW IS MOSTLY VISIBLE DURING THE SUMMER
MONTHS AROUND THE SOLSTICE.  THE PINK BOTTOM GRAPH LINE IN FIGURE 9
REPRESENTS THE 10 METER NOISE LEVEL.  JUST BEFORE 2100, THE BAND NOISE
‰  END OF 25 WPM TEXT  ‰  QST DE W1AW  ƒ