Would you like to detect solar flares this way? The HamSCI citizen science program has developed a Personal Space Weather Station specifically for doppler shift measurements. Yesterday's X-class flare event is by far the most dramatic that I have witnessed thus far." "It is only fairly recently (~4 months) that I started to experiment with monitoring the Doppler shift of HF stations. "I have been monitoring radio stations for decades, noting sudden changes in signal strength as a means of monitoring space weather events," says Curtis. Frequency standards stations such as WWV, WWVH, and CHU transmit carriers with atomic-clock grade frequency stability, so they are perfect sources for Doppler monitoring. Any radio station skipping off the ionosphere will suddenly find its frequency Doppler shifted. When radiation from a solar flare hits Earth's atmosphere, it ionizes the air, temporarily boosting the thickness of our planet's ionosphere. It shifted by 5 Hz, which is a small change, but very obvious!" "During the X-class flare event, I was able to detect the Doppler shift of the station's carrier frequency (green plot). "I monitor the frequency and field strength of Canada's CHU time station transmitting at 7850 KHz," explains Curtis. Brian Curtis of Sault Ste Marie, Michigan, demonstrated the technique during the June 20th X-flare: Solar flare alerts: SMS TextĪround the world, ham radio operators are experimenting with a new way to detect solar flares- the Doppler Shift method. At first it appeared the CME would miss Earth however, additional modeling suggests a glancing blow might be possible. ![]() This is the same CME hurled into space by an X1-class solar flare on June 20th. NOAA forecasters say there is a chance of minor G1-class geomagnetic storms on June 23rd when a CME might hit Earth's magnetic field. 28, 2023, as a show of thanks for years of service and hope for future daisies: Until then, we will maintain AIM's iconic "daily daisy," frozen at Feb. There may be some hope of a recovery as AIM's orbit precesses into full sunlight in 2024. As a result AIM is offline, perhaps permanently. What happened to NASA's AIM spacecraft, which has been monitoring NLCs since 2007? Earlier this year, the spacecraft's battery failed. As the season progresses, these dots will multiply in number and shift in hue from blue to red as the brightness of the clouds intensifies. For the rest of the season, daily maps from NOAA 21 will be presented here:Įach dot is a detected cloud. ![]() An instrument onboard NOAA 21 ( OMPS LP) is able to detect NLCs (also known as "polar mesospheric clouds" or PMCs). The first clouds were detected inside the Arctic Circle by the NOAA 21 satellite. The northern season for NLCs began on May 26th. ![]() There are no coronal holes on the Earthside of the sun. Switch to: Europe, USA, New Zealand, Antarctica Neutron counts from the University of Oulu's Sodankyla Geophysical Observatory show that cosmic rays reaching Earth are slowly declining-a result of the yin-yang relationship between the solar cycle and cosmic rays. Credit: SDO/HMIĬosmic Rays Solar Cycle 25 is intensifying, and this is reflected in the number of cosmic rays entering Earth's atmosphere. Sunspot AR3341 poses a continued threat for X-class solar flares.
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