Tad Cook, K7RA, Seattle, reports: Geomagnetic activity quieted down over the October 1 – 7 reporting week. Compared to the previous 7 days, average daily mid-latitude A index declined from 15.6 to 6, and average planetary A index slipped from 22 to 7.1.
There were no sunspots this week and only one in the previous 7. Average daily solar flux went from 73.4 to 71.8.
On late Thursday, October 8, however, two new Solar Cycle 25 sunspots appeared! They are both in the southern hemisphere, and, as of this writing, had not been assigned numbers.
Check Spaceweather.com later to see the official sunspot numbers. You can check here Friday night to see the daily sunspot numbers and daily total sunspot area over the last month. I just hope this activity isn’t like recent spots, which made only brief, faint appearances.
Predicted solar flux over the next 45 days is 72 on October 9 – 14; 70 on October 15 – 18; 72 on October 19 – 31; 70 on November 1 – 14, and 72 on November 15 – 22.
Predicted planetary A index is 5 on October 9 – 19; 10, 18, 20, and 24 on October 20 – 23; 16, 38, and 38 on October 24 – 26; 26, 15, and 10 on October 27 – 29; 5 on October 30 – November 6; 10 on November 7; 5 on November 8 – 15; 10, 18, 20, and 24 on November 16 – 19; 16 on November 20 – 21, and 38 on November 22.
F.K. Janda, OK1HH, provided this geomagnetic activity forecast for October 9 – November 4. He reports the geomagnetic field will be:
- quiet on October 16, 18, November 2.
- quiet to unsettled on October 9-10, 12-14, 17, 31, November 3-4.
- quiet to active on October 15, 19-20, 28-29, (30,) November 1.
- unsettled to active October 11, 21-24, 27.
- active to disturbed October 25-26.
- Solar wind will intensify on October 13, (14-15, 20-21,) 22, (23-24,) 25-29, (30,) November 2-4.
Note: Parentheses mean lower probability of activity enhancement.
Here’s word from NASA about a new look at sunspots:
Solar physicist Leif Svalgaard predicts a slightly better Solar Cycle 25.
Has the pandemic affected amateur radio activity? Yes, and in a good way.
All that isolation seems to allow more time on the air, if HF contest activity is any indicator.
From Jon, N0JK in Kansas:
Some weak sporadic-E from Kansas to Florida October 6 around 1900 UTC, but stations farther east had some outstanding propagation. Stations in Ecuador worked north to the Gulf Coast, then New England on 6 meters.
Propagation mode? F2 can occur in early October between North America and South America, but the solar flux was only 71 and with no major geomagnetic activity. Multi-hop sporadic-E may have been the mode. Some sporadic-E was spotted from New England to Florida, and Florida to Mexico. E-skip is rare in October, too.
|HC2FG||20/10/06||2104Z||50313.0||still in FN44 Maine||K1TOL|
Jeff Hartley, N8II writes from West Virginia:
“I just finished the California QSO Party. Saturday, 15 meters was very marginal; I made about 20 QSOs. Today, 15-meter conditions were excellent to all of California from 1640 – 1850 UTC, enabling me to work about 110 total 15-meter QSOs. 80 and 40 were excellent to California, with the 40-meter peak about 30 – 60 minutes before their sunset Saturday evening. Some signals on 80 were quite loud, and the California stations were hearing my 200 W very well. Also, signals were still good to California almost 2 hours after my sunrise today on 40. 20 was very poor 2200 – 2300Z Saturday, but improved enough for me to run 20-meter SSB stations 2300 – 2340Z. I noticed some possible sporadic E to central Tennessee and Kentucky in the afternoon on 20 (also some unexpected Illinois stations late morning).”
Tamitha Skov, WX6SWW explains the cause of recent geomagnetic activity.
Sunspot numbers for October 1 – 7 were 0, 0, 0, 0, 0, 0, and 0, with a mean of 0. The 10.7-centimeter flux was 72.8, 72.2, 71.8, 71.2, 72.3, 71.7, and 70.7, with a mean of 71.8. Estimated planetary A indices were 11, 9, 6, 4, 8, 7, and 5, with a mean of 7.1. Middle latitude A index was 11, 6, 5, 3, 7, 6, and 4, with a mean of 6.
Instructions for starting or ending email distribution of ARRL bulletins are on the ARRL website.
Share your reports and observations.
Describing and demonstrating an end-fed multiband antenna for portable use. It’s a full-sized half wave on 20 metres and a loaded half wave on 4... Read more
The RECON provides a multipurpose antenna system, which can be configured to launch your signal in the manner as circumstances require. Many short-ran... Read more
Electromagnetics, the W8JK Antenna, and the “Wow!” Signal Or, “My friend, the Ohio State Professor, Dr John Kraus, W8JK” Bob HoufK7ZB Antenna enthusia... Read more
FT-817ND vs FT-991 using the same Antenna – HyEndFed 5 Band. To give the FT-817ND a fighting chance, I have added the CW filter and I have conne... Read more
“” “The SteppIR CrankIR is portable a vertical HF and 2 meter antenna, it’s lightweight, high performance, extremely portable... Read more
ES-4 COMES AS A CONTROL UNIT AND A BASE (SWITCHING) UNIT THE BASE UNIT RECEIVES 12V POWER AND HAS ALL THE HEAVY COAXIAL CABLES CONNECTED TO IT. THER... Read more
IC-9700 Direct Sampling Brought to the VHF/UHF World Icom IC-9700 strives to be first, to be innovative, and to continue to refine our radios for a ba... Read more
The winning article for the July 2021 QST Cover Plaque award is “A Sensitive Field Strength Meter for Foxhunting,” by Woody White, KZ4AK. The QST Cove... Read more
Friday and Saturday, August 6 – 7, Russian cosmonauts onboard the International Space Station (ISS) will transmit slow-scan television (SSTV) images f... Read more
WL2XUP is an FCC Part 5 Experimental station operated by Lin Holcomb, NI4Y, in Georgia. It’s licensed to operate with up to 400 W effective radiated p... Read more