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Re: 01 Apr 2025 Dawn and dusk
Hi Sabine,
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Wow, this compared to the extreme band noise you caught a couple of days ago, this is realy impressive.
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Huub
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01 Apr 2025 Dawn and dusk
Fast response in the morning and in the evening!
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Sabine
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Germany
Standard time: UTC +1 hour
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Larry K4LED
Solar - Apr 2, 2025 - K4LED
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Larry K4LED
Hi,
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A subtle solar event.
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NOAA record:
3400 ? ? ? 1025 ? //// ? ? ?1028 ?SVI ?C ? RSP ?025-180 ? III/2 ? ? ? ? ? ? ? ??
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Huub
Breda (JO21jn)
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Re: 30 Mar 2025 Dusk and dawn
Hi Sabine,
Of course!? Sorry, as a newbie, every little blip on the spectrum is a new discovery and something more to learn about. :) But obviously not what we want when we¡¯re trying to tune into Radio Jove. ?
Did the overload damage your system or ruin your calibration? Maybe there¡¯s no way to prevent it if the ionosphere is being blasted. ?
It seems like the interference levels and variations in the ionosphere are changing dramatically in the short time since I¡¯ve joined the group.? Especially, the activity in Europe seems very high.
Tyson
Tyson,
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once this happens to you, it's more annoying than interesting! :-))
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Sabine
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Germany
Standard time: UTC +1 hour
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31 Mar 2025 Dawn and dusk
Not so exciting.
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Sabine
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Germany
Standard time: UTC +1 hour
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Re: 30 Mar 2025 Dusk and dawn
Tyson,
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once this happens to you, it's more annoying than interesting! :-))
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Sabine
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Germany
Standard time: UTC +1 hour
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Re: 30 Mar 2025 Dusk and dawn
Wow! I did hear A LOT of contest on all these amateur HF ham bands via my vertical HF antenna on Sunday.? This overload is such an interesting phenomenon to see!?
Extreme band noise in the 15 m amateur radio band (weekend contests?) lead to permanent ADC overload conditions around sunset.
Sabine
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Germany
Standard time: UTC +1 hour
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30 Mar 2025 Dusk and dawn
Extreme band noise in the 15 m amateur radio band (weekend contests?) lead to permanent ADC overload conditions around sunset.
Sabine
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Germany
Standard time: UTC +1 hour
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I know the author and worked with him when he was chairman of the EE department at University of Colorado. ?I think he became president of Virginia Polytech after several good years at CU. ?A very bright individual. ?Many of the most important antenna designers came to work with him including Gupta and Collins.
-Kevin
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I do not recognize the text, but I do recognize the author.?
Dave - W ?LEV Howdy,
Forgive the sidetrack from the normal conversations here. Yesterday I
went to a used book sale and picked up "Field and Wave Electromagnetics"
by David K. Cheng. I am not familiar with the book or the author but it
appears to be a college text with significant sections about radio
waves, antennas, waveguides, and other things that probably relate to
what we are doing/studying here.
Does any one here recognize the text or the author?
Thanks,
~Duane
--
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I do not recognize the text, but I do recognize the author.?
Dave - W ?LEV
Howdy,
Forgive the sidetrack from the normal conversations here. Yesterday I
went to a used book sale and picked up "Field and Wave Electromagnetics"
by David K. Cheng. I am not familiar with the book or the author but it
appears to be a college text with significant sections about radio
waves, antennas, waveguides, and other things that probably relate to
what we are doing/studying here.
Does any one here recognize the text or the author?
Thanks,
~Duane
|
Howdy,
Forgive the sidetrack from the normal conversations here. Yesterday I went to a used book sale and picked up "Field and Wave Electromagnetics" by David K. Cheng. I am not familiar with the book or the author but it appears to be a college text with significant sections about radio waves, antennas, waveguides, and other things that probably relate to what we are doing/studying here.
Does any one here recognize the text or the author?
Thanks,
~Duane
|
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Solar/SID and cluster of faint Type III bursts March 28, 2025
Thanks to John and Tom for the heads-up for the SID associated with the X1 flare yesterday.? I have attached the view from our observatory.? Note not only the SID, but between 15:45 and 16:00 UTC there is a cluster of faint Type III bursts, presumably associated with the large ejection of material that occurred in the minutes after the flare (see ).? That cluster is shown in more detail in the second attached file.
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Richard
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Solar/SID 03/28/2025 Easley, South Carolina
Good evening: ? ? ? Solar/SID from today as well as an additional solar burst. Thanks to Tom for the heads-up.
John
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Re: N event information and example
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On Friday, March 28, 2025, 2:24 PM, Francisco Reyes via groups.io <melipal41@...> wrote:
For those interested in the N events,
Here in these two pages are an explanation and an example of an Io-B N events taken from the 1991 publication
"A Catalog of High Resolution Jovian Decametric Radio Noise Burst Spectra"
By R.S. Flagg, W.B. Greenman, F. Reyes and T.D. Carr
The data was recorded using the 26.3 MHz large array (640 dipoles) at Univ. of Florida Radio Observatory.
The AORS is an Acousto-Optic Radio Spectrograph built by Jorma Riihimaa and operated by Wes Greenman.
Larry explained a few days ago on how to tune and listen to and N- event.
Francisco
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N event information and example
For those interested in the N events,
Here in these two pages are an explanation and an example of an Io-B N events taken from the 1991 publication
"A Catalog of High Resolution Jovian Decametric Radio Noise Burst Spectra"
By R.S. Flagg, W.B. Greenman, F. Reyes and T.D. Carr
The data was recorded using the 26.3 MHz large array (640 dipoles) at Univ. of Florida Radio Observatory.
The AORS is an Acousto-Optic Radio Spectrograph built by Jorma Riihimaa and operated by Wes Greenman.
Larry explained a few days ago on how to tune and listen to and N- event.
Francisco
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Ugly images due to the noise, but the teepees prevail.
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Sabine
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Germany
Standard time: UTC +1 hour
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X1.1 and still rising 1523 UT
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Sabine Cremer
Larry Dodd
Kevin O. Shoemaker
Carl Pajak Phone
