[SFDXA] Geomagnetic Storm Watch and A new Way to detect Solar Flares

[Bill]

/From Tony N2MFT: - Bill W2CQ/

*GEOMAGNETIC STORM WATCH:*NOAA forecasters say there is a chance of 
minorG1 <https://spaceweather.com/glossary/g1.jpg>-class geomagnetic 
storms on June 23rd whena CME 
<https://spaceweather.com/images2023/20jun23/cme_anim.gif>might hit 
Earth's magnetic field. This is the same CME hurled into space by 
anX1-class solar flare 
<https://spaceweather.com/images2023/20jun23/xflare_anim.gif>on June 
20th. At first it appeared the CME would miss Earth; however, additional 
modeling suggests a glancing blow might be possible.*Solar flare 
alerts:*SMS Text <https://spaceweatheralerts.com/>

*A NEW WAY TO DETECT SOLAR FLARES:*Around the world, ham radio operators 
are experimenting with a new way to detect solar flares--the Doppler 
Shift method <https://essd.copernicus.org/articles/15/1403/2023/>. Brian 
Curtis of Sault Ste Marie, Michigan, demonstrated the technique during 
the June 20th X-flare:

<https://spaceweathergallery2.com/indiv_upload.php?upload_id=197009>

"I monitor the frequency and field strength of Canada's CHU time station 
transmitting at 7850 KHz," explains Curtis. "During the X-class flare 
event, I was able to detect the Doppler shift of the station's carrier 
frequency (green plot). It shifted by 5 Hz, which is a small change, but 
very obvious!"

When radiation from a solar flare hits Earth's atmosphere, it ionizes 
the air, temporarily boosting the thickness of our planet's ionosphere. 
Any radio station skipping off the ionosphere will suddenly find its 
frequency Doppler shifted. Frequency standards stations such asWWV 
<https://en.wikipedia.org/wiki/WWV_(radio_station)>,WWVH 
<https://www.nist.gov/pml/time-and-frequency-division/time-distribution/radio-station-wwv>, 
andCHU <https://en.wikipedia.org/wiki/CHU_(radio_station)>transmit 
carriers with atomic-clock grade frequency stability, so they are 
perfect sources for Doppler monitoring.

"I have been monitoring radio stations for decades, noting sudden 
changes in signal strength as a means of monitoring space weather 
events," says Curtis. "It is only fairly recently (~4 months) that I 
started to experiment with monitoring the Doppler shift of HF stations. 
Yesterday's X-class flare event is by far the most dramatic that I have 
witnessed thus far."

Would/you/like to detect solar flares this way? TheHamSCI 
<https://hamsci.org/>citizen science program has developed aPersonal 
Space Weather Station 
<https://hamsci.org/basic-project/personal-space-weather-station>specifically 
for doppler shift measurements. This technique can also be used to 
studysolar eclipses <https://hamsci.org/eclipse>.


https://spaceweather.com
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