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Let the Sun Shine!

September 23, 2011 By Dan KB6NU 4 Comments

It looks as though solar activity is picking up, and with that propagation on the HF bands. The ARRL Letter reports:

Solar FlareTad “Somewhere the Sun is shining” Cook, K7RA, reports: Compared to the uneventful past few years, sunspot activity was truly remarkable this week. The daily sunspot number for September 16 was 173. We haven’t see numbers like this in more than six years, when the sunspot number was 181, way back on July 5, 2005 in Solar Cycle 23. The solar flux reached 150.1 on September 18. Just six months ago it was slightly higher, 153 on March 7 and 155 on March 8, but prior to that the only higher number was 157.3 on August 22, 2005, about 7 weeks after the sunspot number of 181. Currently, the solar flux and planetary A index forecast from USAF/NOAA calls for solar flux of 144 on September 22-23, 140 on September 24-25, 145 on September 26-28, 130 on September 29 through October 1, and 135 on October 2-5. The planetary A index is predicted at 5 on September 22-24, 8 on September 25, 5, 8, 5, 5, 15 and 8 on September 26 through October 1, and 5 on October 2-7. Look for more information on the ARRL website on Friday, September 23. For more information concerning radio propagation, visit the ARRL Technical Information Service Propagation page.

On Tuesday, I worked a guy on 40m, and he reported that 10m was wide open all day. Time for some DX!

Related posts:

  1. 2015 General Class study guide: Section G3A – Sunspots and solar radiation, ionospheric disturbances, propagation forecasting, and indices
  2. Special Propagation Bulletin – 5/16/05
  3. Just when you thought it couldn’t get any worse…
  4. Here Comes the Sun (doo doo doo doo)

Filed Under: Propagation

Reader Interactions

Comments

  1. David Brodbeck N8SRE says

    September 23, 2011 at 1:10 pm

    Guess it’s time to dig my 10m mobile rig back out of the closet! It was last installed two cars ago.

    Reply
  2. Nick, KD8IPE says

    September 24, 2011 at 1:47 pm

    Wow, for the first time ever, I heard signals on 12m and 10m. Time to double check the rotatable dipole and get to work!

    Reply
    • Dan KB6NU says

      September 24, 2011 at 4:25 pm

      Indeed it is time to dig out that 10m rig. Down at the museum today, we were booming in to Europe.

      Reply
  3. Mike says

    September 24, 2011 at 5:10 pm

    Good evening Dan, I can remember setting up an FT-857 along with a Miracle whip on my bed side table. I was able to PSK into Europe while my wife was watching TV!!! Seems those days are going to be returning.

    Reply

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