<div dir="ltr">Hi All,<br><div><br></div><div>One of the really cool things about the summer is that the sferic
density is much, much higher than in the winter and it's so cool to see
the contrast between them. <br><br>Here is a spectrum plot from my VLF
receiver. Aside from the NAA, NLK, and NAU peaks, you see the elevated
noise floor in the sferics band:<br></div><div><img src="cid:ii_l6bmb7yb0" alt="Screen Shot 2022-08-01 at 10.29.59 PM.png" width="453" height="178"><br></div><div><br></div><div>Here is a 3 second spectrogram from the above timestamp:<br></div><div><img src="cid:ii_l6bmcvw21" alt="2022-08-02_02-30-04p3s_summer_sferics.png" width="453" height="242"><br></div><div><br></div><div>The sferic density is quite impressive, but this is typical in the summer months when there is much more lightning. <br><br>This
is in contrast to the winter months when sferic density is much lesser.
The earth-ionosphere waveguide also treated us to some nice multimode
tweeks as well:<br></div><div><img src="cid:ii_l6bme1872" alt="tweeks_1-2-22_2_25.png" width="453" height="242"><br></div><div><br></div><div>Jonathan</div><div>KC3EEY</div></div>