[SFDXA] ARRL Solar Report for Thursday April 2, 2026 - ARRL Letter

[Bill]

*The ARRL Solar Report*

<https://arrl.informz.net/z/cjUucD9taT0zNTkyNzQ2JnA9MSZ1PTUyNTQ3MzY2NCZsaT00MjMxMTIyOA/index.html>

New solar disk image courtesy of the Learmonth Solar Observatory, April 
2, 2026

*ARRL Solar Report for Thursday April 2, 2026*

Solar activity has been at low levels with only C-class flares produced 
by Regions 4401, 4405, and 4409. There were 9 numbered active regions on 
the solar disk, with 4409 showing the most significant growth during the 
period and producing the largest flares on April 1. A new region emerged 
but it has not yet been numbered.

Multiple filaments erupted during the day on April 1, producing coronal 
mass ejections (CMEs) observed in coronagraph imagery, but their 
propagation modeling did not suggest impacts to Earth. The exceptions 
are the ejecta first observed at GONG H-alpha images on April 1.

Solar activity is likely to reach moderate (R1/R2-minor/moderate) 
levels, with a slight chance for X-class (R3-strong) flares through 
April 4, due primarily to the flare potential of Regions 4404, 4405 and 
4409.

Solar wind parameters were near nominal levels with solar wind speed 
averaging around 440 km/s. Enhanced solar wind disturbances are likely 
through April 2 due to the arrival of the March 30 CME. Conditions are 
likely to give way to coronal hole high speed stream (CH HSS) activity 
by mid-to-late April 2.

The 10.7-centimeter flux: April 2, 155; April 3, 150; April 4 – 5, 145; 
April 6 ,135; April 7, 125; April 8, 118.

Predicted sunspot numbers: April 2, 109; April 3, 104; April 4, 115; 
April 5, 101; April 6, 119; April 7, 95; April 8, 124.

For more information concerning radio propagation, visit 
<https://arrl.informz.net/z/cjUucD9taT0zNTkyNzQ2JnA9MSZ1PTUyNTQ3MzY2NCZsaT00MjMxMTIyOA/index.html> 
the ARRL Technical Information Service, read A Quick Guide to HF 
Propagation Using Solar Indices 
<https://arrl.informz.net/z/cjUucD9taT0zNTkyNzQ2JnA9MSZ1PTUyNTQ3MzY2NCZsaT00MjMxMTIyOQ/index.html>, 
and check out 
<https://arrl.informz.net/z/cjUucD9taT0zNTkyNzQ2JnA9MSZ1PTUyNTQ3MzY2NCZsaT00MjMxMTIzMA/index.html> 
the Propagation Page of Carl Luetzelschwab, K9LA.

For customizable propagation charts, visit the VOACAP Online for Ham 
Radio website 
<https://arrl.informz.net/z/cjUucD9taT0zNTkyNzQ2JnA9MSZ1PTUyNTQ3MzY2NCZsaT00MjMxMTIzMQ/index.html>.

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