Groundwave or Skywave, Grayline, TEP etc

WA2ZKD

KD2OM and I were discussing Long and Medium Wave propagation, Skywave and Groundwave. I found this document

https://www.bbceng.info/additions/2016/No. 10 - Long-Wave And Medium-Wave Propogation.pdf

WA2ZKD

another related document

http://www.dtic.mil/dtic/tr/fulltext/u2/a110671.pdf

WA2ZKD

here's something on TEP

http://www.sws.bom.gov.au/Category/Educational/Other Topics/Radio Communication/Transequatorial.pdf

WA2ZKD

The one mode I can't find any info on but surely exists is TMD, Trans Mason-Dixon line. That is, where we in the Northeast seem to hear so many retirees and snowbirds in Florida :-)

jks

At my old QTH I had regular LF TEP of JJY 40 kHz starting around midday (but never JJY 60 kHz).