CQ Amateur Radio

PROPAGATION

The new Sunspot Cycle 25 is bursting to life — and the first M-class flare of this new cycle erupted on May 29, 2020, between 07:20 and 07:30 UTC. It peaked at a maximum energy level of M1.1. The event started at 0713, peaked at 0724, and ended at 0728 UTC, the first major flare in 925 days. (See Figure 1)

Some have wondered if we had entered a grand solar minimum <https://g.nw7us.us/2MrV5q6>. The truth is, just like the cycle minimum period between Cycles 23 and 24, this period between Cycle 24 and the new Cycle 25 was prolonged, but not in the same category as the Grand Solar Minimum of 1645 to 1715 during which sunspots became exceedingly rare, as was noted then by solar observers <https://g.nw7us.us/mm1645>. At least, that’s the consensus at the moment. There have been more sunspots, this year, as 2020 unfolds.

Another sign that we are entering Sunspot Cycle 25 is Hale’s Polarity Law holding true as Cycle 24 ends. Hale’s Polarity Law pertains to how the sun’s magnetic fields follow certain patterns. Specifically, this law states that the leading and trailing magnetic fields in an active solar region belonging to the older sunspot cycle have the opposite magnetic orientation to

You’re reading a preview, subscribe to read more.

More from CQ Amateur Radio

CQ Amateur Radio1 min read
On the Cover …
Vladimir Kovaceski, Z35M, is ham radio’s “marathon man.” His first CQ article, back in 2005, described his making more than 43,000 contacts the previous year. He’s checked in periodically with us since then, writing about various additional feats and
CQ Amateur Radio3 min read
Antennas
I have been doing a lot of work on direction-finding antennas lately, so it sure seemed like it would be a good topic for this issue. In Photo A, we have the classic ferrite rod antenna used in most AM radios, often called a wave magnet in the early
CQ Amateur Radio6 min read
Vhf Plus
During August, an impressive high-pressure system was in place over the middle of the country, bringing sweltering heat and weeks without rain. A silver lining to the weather, however, was the tropospheric ducting that resulted across the region. Pho

Related Books & Audiobooks