|Subject:||Re: LF: Daytime MF prpagation beyond the groundwave|
|From:||Markus Vester <[email protected]>|
|Date:||Sun, 4 Dec 2016 14:17:48 -0500|
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I have to admit that I have no proof that the "winter anomaly" has any effect on the lower ionosphere. As Roelof and others have indicated, increased daytime MF / LF signal strength may rather be due to less (and not more) buildup of absorbing D-layer ionisation during shorter daylight hours. In addition, QRN activity tends to be lower at least in mid latitudes.
Von: hvanesce <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: So, 4 Dez 2016 4:15 pm
Betreff: RE: LF: Daytime MF prpagation beyond the groundwave
Markus and Stefan,
Thank you for the winter anomaly reference and example.
Stefan originally referred to 630m and Markus’ comments did not specifically ascribe the anomaly itself (just groundwave distance) to VLF but I am curious: is the anomaly evident at VLF? Reliable at VLF? My question relates to the wiki description of an F2 layer effect, and I wondered if F2 (and hence the anomaly) is perhaps significant in nighttime VLF propagation, or if perhaps there is also some process similar to the F2 winter anomaly in the D layer which would affect VLF. Do either of you have thoughts on the winter anomaly at VLF frequencies?
From: owner-[email protected] [mailto:[email protected]] On Behalf Of Markus Vester
Hi Andy, Stefan,
Hello Stefan. Sorry but I do not understand.
Can you explain to us scientifically why
you said that there is a difference enter winter and summer for day time groundwave mode of propagation ?
Also, an other question : can you tell us honestly which is your exact EIRP transmitting power, because on day time groundwave there is not usual to have a WSPR2 report on the 630 meters band of –17 dB S/N over 1500 km (Remember that he legal maximum power in DK is 1 Watt EIRP, and nobody can ignore the law ).
Sent: Sunday, December 4, 2016 11:52 AM
Subject: LF: Daytime MF prpagation beyond the groundwave
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