MW propogation and weather
Last night on the AM broadcast band, the stations up and down the East
Coast that traditionally boom in were not so strong. The Canadian station on 740 which is usually all there is had some obvious competition from stations in the SW... Texas/Oklahoma? Also the stations from upstate New York which normally boom in had other signals fading in and out against them. And WGN which is not all that reliably received here in Washington DC was booming in real strong. Is this possibly related to the strong weather that has been moving through the midwest (and is due to hit here on the E Coast tonight)? Or is it just a sign of the end of Winter MW propogation? Tim. |
MW propogation and weather
There is/was a strong cold front running from the SW (Kansas?) up towards
the NE (Michigan?) so I would guess that the cold front caused some type of ducting? The temperature differences on either side of this particular frontal boundary is/are quite large. Although ducting of this type, as I understand, is a phenomenon which more commonly occurs on UHF/VHF frequencies. Perhaps someone with more knowledge/experience will chime in with their comments in regards to MW frequencies and approaching cold fronts. wrote in message oups.com... Last night on the AM broadcast band, the stations up and down the East Coast that traditionally boom in were not so strong. The Canadian station on 740 which is usually all there is had some obvious competition from stations in the SW... Texas/Oklahoma? Also the stations from upstate New York which normally boom in had other signals fading in and out against them. And WGN which is not all that reliably received here in Washington DC was booming in real strong. Is this possibly related to the strong weather that has been moving through the midwest (and is due to hit here on the E Coast tonight)? Or is it just a sign of the end of Winter MW propogation? Tim. |
MW propogation and weather
Is this possibly related to the strong weather that has been moving
through the midwest (and is due to hit here on the E Coast tonight)? Or is it just a sign of the end of Winter MW propogation? Good question-- my state (Minnesota) was on the northern edge of that storm path, and the storm has passed well to our east now. I'll do some checking around on the MW broadcast band after it gets dark here (around 6:50 local time) and report back if I can't hear the usual stalwarts from the Midwest and South, or if I hear stations that usually don't come in to my area. Jackie |
MW propogation and weather
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MW propogation and weather
"Telamon" wrote in message ... Do weather changes affect the ionosphere in the lower layers that are responsible for night time propagation? I've wondered the same thing. If we're technically at "solar minimum" in terms of solar activity, and yet our reports show something of a change in reception/propagation, I have to wonder how much geophysical events effect MW propagation. As an aside, Southern Minnesota (where I live) just got slammed with a late winter storm, so I'm very curious as to how (or if) the storm might've affected what I will hear tonight. I'm going to turn on the radio right now, and "see" what I can hear... if there is a departure from my usual MW reception at this time of year, I'll report back. Jackie |
MW propogation and weather
In article ,
"Buzzygirl" wrote: "Telamon" wrote in message ... Do weather changes affect the ionosphere in the lower layers that are responsible for night time propagation? I've wondered the same thing. If we're technically at "solar minimum" in terms of solar activity, and yet our reports show something of a change in reception/propagation, I have to wonder how much geophysical events effect MW propagation. As an aside, Southern Minnesota (where I live) just got slammed with a late winter storm, so I'm very curious as to how (or if) the storm might've affected what I will hear tonight. I'm going to turn on the radio right now, and "see" what I can hear... if there is a departure from my usual MW reception at this time of year, I'll report back. Well, the only other thing I can think of is a change in ground conductivity with the weather. -- Telamon Ventura, California |
MW propogation and weather
It's possible that the presence of strong ionization in the atmosphere
caused by violent winds could steer or even absorb or wipe out signals. Also, the earth's magnetic field is becoming weaker and erratic. The field is going to affect how signals propogate, and if the field changes because of the solar wind, that will also affect it. All life all holiness come from you O Lord http://home.earthlink.net/~damienmj/index.htm http://home.earthlink.net/~damianomj/swallowindex.htm wrote in message oups.com... Last night on the AM broadcast band, the stations up and down the East Coast that traditionally boom in were not so strong. The Canadian station on 740 which is usually all there is had some obvious competition from stations in the SW... Texas/Oklahoma? Also the stations from upstate New York which normally boom in had other signals fading in and out against them. And WGN which is not all that reliably received here in Washington DC was booming in real strong. Is this possibly related to the strong weather that has been moving through the midwest (and is due to hit here on the E Coast tonight)? Or is it just a sign of the end of Winter MW propogation? Tim. |
MW propogation and weather
In article . net,
"Verstaldin" wrote: wrote in message oups.com... Last night on the AM broadcast band, the stations up and down the East Coast that traditionally boom in were not so strong. The Canadian station on 740 which is usually all there is had some obvious competition from stations in the SW... Texas/Oklahoma? Also the stations from upstate New York which normally boom in had other signals fading in and out against them. And WGN which is not all that reliably received here in Washington DC was booming in real strong. Is this possibly related to the strong weather that has been moving through the midwest (and is due to hit here on the E Coast tonight)? Or is it just a sign of the end of Winter MW propogation? It's possible that the presence of strong ionization in the atmosphere caused by violent winds could steer or even absorb or wipe out signals. Also, the earth's magnetic field is becoming weaker and erratic. The field is going to affect how signals propogate, and if the field changes because of the solar wind, that will also affect it. All life all holiness come from you O Lord http://home.earthlink.net/~damienmj/index.htm http://home.earthlink.net/~damianomj/swallowindex.htm The lower ionosphere goes as low as 50 km to the top of the stratosphere where it's possible the jet stream could affect it. Our weather in the troposphere can't though. My compass is still working so the earths magnetic field is still OK. -- Telamon Ventura, California |
MW propogation and weather
Buzzygirl wrote:
"Telamon" wrote in message ... Do weather changes affect the ionosphere in the lower layers that are responsible for night time propagation? I've wondered the same thing. If we're technically at "solar minimum" in terms of solar activity, and yet our reports show something of a change in reception/propagation, I have to wonder how much geophysical events effect MW propagation. Well, there are obvious winter/summer and day/night effects. In fact the warm front preceding the storm system produced temperatures in the mid-80's here, in what is still technically winter! Does that mean that my expectations of "summer" vs "winter" MW propogation should change when the temperature goes up and down? And I've wondered if solar activity/storms etc. affects weather and storm patterns on earth. I have some anecdotal experience (gees, that was a big solar event, and hey we had bad thunderstorms last night too!) but I don't believe just that. Somebody somewhere must've done a more global study. Tim. |
MW propogation and weather
I'v commented before that it could take a long time to diminish altogether
s, but instrumentation exists that can measure the change. All life all holiness come from you O Lord http://home.earthlink.net/~damienmj/index.htm http://home.earthlink.net/~damianomj/swallowindex.htm "Telamon" wrote in message ... In article . net, "Verstaldin" wrote: wrote in message oups.com... Last night on the AM broadcast band, the stations up and down the East Coast that traditionally boom in were not so strong. The Canadian station on 740 which is usually all there is had some obvious competition from stations in the SW... Texas/Oklahoma? Also the stations from upstate New York which normally boom in had other signals fading in and out against them. And WGN which is not all that reliably received here in Washington DC was booming in real strong. Is this possibly related to the strong weather that has been moving through the midwest (and is due to hit here on the E Coast tonight)? Or is it just a sign of the end of Winter MW propogation? It's possible that the presence of strong ionization in the atmosphere caused by violent winds could steer or even absorb or wipe out signals. Also, the earth's magnetic field is becoming weaker and erratic. The field is going to affect how signals propogate, and if the field changes because of the solar wind, that will also affect it. All life all holiness come from you O Lord http://home.earthlink.net/~damienmj/index.htm http://home.earthlink.net/~damianomj/swallowindex.htm The lower ionosphere goes as low as 50 km to the top of the stratosphere where it's possible the jet stream could affect it. Our weather in the troposphere can't though. My compass is still working so the earths magnetic field is still OK. -- Telamon Ventura, California |
MW propogation and weather
In article ,
dxAce wrote: Telamon wrote: Do weather changes affect the ionosphere in the lower layers that are responsible for night time propagation? I rather doubt it as the D layer (lowest of the ionosphere) begins about 30 miles up. But there's been some recent discoveries that strong lighting strikes have an upwards effect that goes about that high. (Buzzword: Sprites.) And, I gather, there was a whole lot of lightning in that storm. Mark Zenier Googleproofaddress(account:mzenier provider:eskimo domain:com) |
MW propogation and weather
Telamon was a Greek dudette.Hows the water over yonder?
cuhulin |
MW propogation and weather
I Am Always Right.
cuhulin |
MW propogation and weather
In article . net,
"Verstaldin" wrote: All life all holiness come from you O Lord http://home.earthlink.net/~damienmj/index.htm http://home.earthlink.net/~damianomj/swallowindex.htm "Telamon" wrote in message ... In article . net, "Verstaldin" wrote: wrote in message oups.com... Last night on the AM broadcast band, the stations up and down the East Coast that traditionally boom in were not so strong. The Canadian station on 740 which is usually all there is had some obvious competition from stations in the SW... Texas/Oklahoma? Also the stations from upstate New York which normally boom in had other signals fading in and out against them. And WGN which is not all that reliably received here in Washington DC was booming in real strong. Is this possibly related to the strong weather that has been moving through the midwest (and is due to hit here on the E Coast tonight)? Or is it just a sign of the end of Winter MW propogation? It's possible that the presence of strong ionization in the atmosphere caused by violent winds could steer or even absorb or wipe out signals. Also, the earth's magnetic field is becoming weaker and erratic. The field is going to affect how signals propogate, and if the field changes because of the solar wind, that will also affect it. All life all holiness come from you O Lord http://home.earthlink.net/~damienmj/index.htm http://home.earthlink.net/~damianomj/swallowindex.htm The lower ionosphere goes as low as 50 km to the top of the stratosphere where it's possible the jet stream could affect it. Our weather in the troposphere can't though. My compass is still working so the earths magnetic field is still OK. I'v commented before that it could take a long time to diminish altogether s, but instrumentation exists that can measure the change. I was just joking. Yes the magnetic pole is drifting and lately the field strength is weakening over time. -- Telamon Ventura, California |
MW propogation and weather
Calidonia,,, just what makes your hard head so hard?
cuhulin |
MW propogation and weather
wrote in message oups.com... And I've wondered if solar activity/storms etc. affects weather and storm patterns on earth. I have some anecdotal experience (gees, that was a big solar event, and hey we had bad thunderstorms last night too!) but I don't believe just that. Somebody somewhere must've done a more global study. Not sure, it would be interesting trying to find out though. I wonder if Tomas Hood has done any studies on this? He has an excellent SW propagation page at http://prop.hfradio.org/ . It even features forums for discussion of the subject, although I have not had time to really delve into it. Jackie |
MW propogation and weather
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