Tad Cook, K7RA, Seattle, Washington, reports:
| New sunspot groups appeared on March 31, April 1, April 2, April 3, and April 5. This Solar Dynamics Observatory (SDO) image was taken on April 7, 2022. [NASA SDO/HMI photo] |
A lot of solar activity livened up HF conditions over the past reporting week, March 31 to April 6. Average daily sunspot number rose from 90.1 to 94.6, and daily solar flux from 132.7 to 135.3.
A new sunspot group appeared on March 31, two more on April 1, another on April 2, one more on April 3, and another on April 5.
Predicted solar flux is 116, 115, 118, 112, and 110 on April 7 – 11, 108 on April 12 – 14, 120 on April 15 – 17, 125 on April 18 – 19, 130 on April 20 – 23, 140 on April 24 – 28, 135 on April 29 – 30, 130 on May 1, 120 on May 2 – 3, 125 on May 4 – 5, 120 on May 6, 115 on May 7 – 8, and 110 on May 8 – 9.
Predicted planetary A index is 25, 12, 15, 10, and 8 on April 7 – 11; 5 on April 12 – 19; 10 on April 29 – 21; 5, 15, 10, and 8 on April 22 – 25; 5 on April 26 – 28; 18, 12, 10, and 8 on April 29 through May 2; 5 on May 3 – 7, and 12 and 10 on May 8 – 9.
Sunspot numbers for March 31 through April 6, 2022 were 84, 109, 118, 129, 86, 75, and 61, with a mean of 94.6. The 10.7-centimeter flux was 149, 3, 146.6, 143.3, 140.2, 128, 122.4, and 117, with a mean of 135.3. Estimated planetary A indices were 27, 17, 22, 10, 11, 6, and 8, with a mean of 14.4. Middle latitude A index was 18, 12, 19, 7, 8, 6, and 6, with a mean of 10.9.
A comprehensive K7RA Solar Update is posted Fridays on the ARRL website. For more information concerning radio propagation, visit the ARRL Technical Information Service, read “What the Numbers Mean…,” and check out the Propagation Page of Carl Luetzelschwab, K9LA.
A propagation bulletin archive is available. For customizable propagation charts, visit the VOACAP Online for Ham Radio website.
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