Strong solar flare?

[fasleitung3]

Hi,
we experienced very strong interference on our telescopes today from ~
7:30 UTC until ~ 11:15 UTC. There is some initial indication that it
might be caused by the sun. We noted that there is an active sunspot
AR3663 and a X1.0 category flare has been reported on spaceweather. I
am wondering wether any of the solar observers here have noted
somethiing special during the times mentioned.
Thanks,
Wolfgang

[Anthony]

Hi Wolfgang,

Yes, there has been considerable solar activity for the past few days. You can review data here if you like:

https://www.spaceweather.gov/communities/space-weather-enthusiasts-dashboard

https://geomag.bgs.ac.uk/data_service/space_weather/current_conditions.html

--
--
You received this message because you are subscribed to the Google
Groups "Society of Amateur Radio Astronomers" group.
To post to this group, send email to sara...@googlegroups.com
To unsubscribe from this group, send email to
sara-list-...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/sara-list?hl=en
---
You received this message because you are subscribed to the Google Groups "Society of Amateur Radio Astronomers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to sara-list+...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/sara-list/bad52b24ce66074f626a8a32eb530752ebb9c528.camel%40googlemail.com.

[fasleitung3]

Actually I was able to find out: There is a bit of overlap between
solar visibility at our site and the Learnmoth observatory in Australia
which monitors the sun. And indeed, at ~ 7:30 UT they recorded an
increase of the soloar flux @1415 MHz by a factor of 10. We saw this
and even bigger flares later today.
Best regards,
Wolfgang

[Dave Typinski]

Hi Wolfgang,

The Sun was still below the horizon here, but FWIW here's the PRESTO bulletin
from the SIDC.

=====
:Issued: 2024 May 08 0824 UTC
:Product: documentation at http://www.sidc.be/products/presto
#--------------------------------------------------------------------#
# FAST WARNING 'PRESTO' MESSAGE from the SIDC (RWC-Belgium) #
#--------------------------------------------------------------------#
Two X-class flares have occurred. The first X1.0 flare has occurred with a peak
time 01:41 UTC on May 08 which was produced by NOAA AR 3663. The second X1.0
flare has occurred with peak time 05:09 UTC on May 08 which was produced by NOAA
AR 3664. Type II and type IV radio emissions were detected at 05:01 UTC and
05:08 UTC, respectively, during the second flaring activity. There was no
increase observed in the GOES proton flux during either flare. Moderately
disturbed radio communications have been observed in relation to these flaring
activities.
#--------------------------------------------------------------------#
# Solar Influences Data analysis Center - RWC Belgium #
# Royal Observatory of Belgium #
# #
# Website http://www.sidc.be. #
# E-mail sidc-s...@oma.be #
# To unsubscribe http://www.sidc.be/registration/unsub.php #
# #
# Legal notices: #
# - Intellectual Property Rights: #
# http://www.astro.oma.be/common/internet/en/data-policy-en.pdf #
# - Liability Disclaimer: #
# http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf #
# - Use and processing of your personal information: #
# http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf #
#--------------------------------------------------------------------#

=====

--
Dave

[fasleitung3]

Thanks for the input, I believe the picture is getting pretty clear:

Learmonth observed a first burst at ~ 05:04 UTC reaching about 260 SFU
@1415 MHz. This is consistent with the report from RWC-Belgium cited
by Dave.
Further plots from Learmonth show even higher activity starting around
7:30 UTC reaching 1000 SFU. This is also when the Belgain site shows
strong solar acitivty https://www.sidc.be/humain/ah_overview
At that time the sun was above the horizon for us and this is when we
noticed the strong increase in radio signal in L-Band.
We have seen the highest flux density at 12:14 UTC @ 1419 MHz at our
site. This is in excellent agreement with the monitoring at the Belfian
site. We believe this has reached around 24,000 SFU which is amazing.

I have attached our recording of the solar activity from today. The
second (violet) line shows the activity from yesterday. What a
difference!

Cheers,
Wolfgang

[Marcus D. Leech]

On 08/05/2024 10:57, 'fasleitung3' via Society of Amateur Radio

Is this from your big dish, or a solar tracker?  If from your big dish,
is this just in the sidelobes?

[fasleitung3]

This is with our "coffee can" interferometer. We noticed unusual
signals today and started to investigate. We found that we would also
get very big fringes which correlated with the solar fringes from the
day before. So it was likely that this was coming from the sun.
Our 25-m dish was also impaired as obviously we get radiation into our
sidelobes.
Wolfgang

Am Mittwoch, den 08.05.2024, 11:12 -0400 schrieb Marcus D. Leech:
>
> >
> Is this from your big dish, or a solar tracker? If from your big
> dish,
> is this just in the sidelobes?
>
>

> --

[Marcus D. Leech]

On 08/05/2024 11:29, 'fasleitung3' via Society of Amateur Radio

Astronomers wrote:
> This is with our "coffee can" interferometer. We noticed unusual
> signals today and started to investigate. We found that we would also
> get very big fringes which correlated with the solar fringes from the
> day before. So it was likely that this was coming from the sun.
> Our 25-m dish was also impaired as obviously we get radiation into our
> sidelobes.
> Wolfgang

There have been a couple of times in the last week or so when our daily
M42 transit scans were "polluted" with an unexpected
  noise-floor increase.  Since M42 is a daytime object at the moment,
it seems likely that these were solar related.

[James Abshier]

Wolfgang,

Now that you mention it, I did see something in last nights
interferometer run here in Novi, Michigan. The attached plot is part of
the record that shows a large signal near the end of the plot. The plot
ends in the morning here when I usually stop the run and copy the data
for subsequent analysis. Recently I have been running my wide band
receiver (25 MHz Bandwidth) and strong occasional interference is not
unusual so I didn't think much about the strong signal near the end of
the plot until I saw your message. The UTC of my data seems to coincide
with the UTC of the strong signal shown in your plot. (See Attached Plot)

Jim Abshier

On 5/8/24 10:57, 'fasleitung3' via Society of Amateur Radio Astronomers
wrote:

[Dr. Rich Russel]

GOES X-ray Flux | NOAA / NWS Space Weather Prediction Center

GOES X-ray Flux | NOAA / NWS Space Weather Prediction Center

There was also an X flare on May 6 about 0630 UTC. 

May 8,  there were 3 X level flares

Rich

 

--
--
You received this message because you are subscribed to the Google
Groups "Society of Amateur Radio Astronomers" group.
To post to this group, send email to sara...@googlegroups.com
To unsubscribe from this group, send email to
sara-list-...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/sara-list?hl=en
---
You received this message because you are subscribed to the Google Groups "Society of Amateur Radio Astronomers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to sara-list+...@googlegroups.com.

To view this discussion on the web visit https://groups.google.com/d/msgid/sara-list/33cd8eab-ba8e-4bbe-9f9f-decfa0088477%40ameritech.net.