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W1AW and Maritime Radio Historical Society station K6KPH will
transmit at various times the official W1AW Field Day Bulletin using
CW, Phone, and various digital modes.  Please note the Field Day
bulletin will not be sent out via EchoLink.  In addition, on Friday
local, June 27, 2025, the digital version of the 2025 Field Day
bulletin sent by W1AW at 9 PM EDT, or 0100 UTC on June 28, will be
transmitted using BPSK31, Baudot, and MFSK16 in this order.  The
regular digital mode lineup of Baudot, BPSK31, and MFSK16 will be
used during Field Day weekend, June 28 and 29.  The full 2025 W1AW
and K6KPH Field Day Bulletin Schedule can be found in teleprinter,
packet and Internet versions of 2025 ARRL Special Bulletin ARLX006.
Solar activity reached high levels when Region AR4114 produced the
strongest event of the period, an X1.9 flare at 2350 UTC. The region
remained the most complex on the disk despite being in a decay
phase. The other numbered spotted regions on the visible disk were
either mostly stable or in gradual decay. No Earth directed CMEs
were observed in available coronagraph imagery.  Solar wind
parameters continued to reflect a positive polarity CH HSS, or
Coronal Hole High Speed Stream, regime.  The geomagnetic field is
expected to be at quiet to unsettled levels on June 21, and at quiet
levels on June 22.  Geomagnetic field activity is likely to reach
G1, Minor, storm levels on June 25 and 26 due to negative polarity
CH HSS influences.  Solar activity is still at the peak of its
eleven year cycle, even though it reached its maximum last summer,
with a monthly average of R of 216 in August last year and a
smoothed average of R12 of 160.8 for October last year. The change
from last year is the shift of sunspot activity from the southern to
the northern half of the solar disc. The appearance of new sunspot
activity in the southeast in recent days, close to the solar
equator, came as a slight surprise.  This Spring, especially in May
and early June, we could not fail to notice frequent periods of
solar wind intensification and, consequently, a number of
geomagnetic disturbances, which caused the critical frequencies of
the ionospheric F layer to drop to values corresponding to
significantly lower solar activity. In recent days, there has been
only a slight improvement.  Most forecasts for future solar activity
predict a continuing decline, but if we assume higher activity in
the currently setting sunspot groups, we can expect an increase
after their appearance on the north eastern limb of the solar disc
in July.  Overall, calmer conditions can be expected during the
coming Summer, although shortwave propagation conditions will
continue to be slightly worse than would correspond to the level of
solar activity.  For customizable propagation charts, visit the
VOACAP Online for Ham Radio website at, //www.voacap.com/hf/ .  The
Predicted Planetary A Index for June 21 to 27 is 5, 5, 8, 12, 25,
20, and 15, with a mean of 12.9.  Predicted Planetary K Index is 2,
2,3, 4, 5, 5, and 4, with a mean of 3.6.  10.7 centimeter flux is
138, 135, 125, 125, 130, 125, and 125, with a mean of 129.

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