> /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
>
> PRELIMINARY DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
>
> 23 APRIL, 2005
>
> /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
>
> (Based in-part on SEC Data.)
> (The final report will be released tommorrow.)
>
>
> PRELIMINARY SOLAR & GEOPHYSICAL INDICES FOR 23 APRIL, 2005
> ----------------------------------------------------------
>
> DRAO 10.7 cm Solar Flux at 18Z, 20Z, 22Z: N/A, N/A, N/A sfu.
> Predicted Solar Flux for Next 3 Days: 80, 85, 85.
> Average 90-day Solar Flux: 90.
> Current Middle Latitude A-Index: 9
> Current Boulder K-Indices: 1122 243*
> Current Planetary K-Indices: 1122 222*
> Boulder A-Index 3-Day Forecast: 10, 8, 5.
> Planetary A-Index 3-Day Forecast: 20, 10, 8.
>
>
> SYNOPSIS OF TODAYS ACTIVITY
> ---------------------------
>
> Solar activity continues at very low levels. There are
> just a couple of very small and simple sunspot groups on the visible
> disk. Occasional bright surges were observed on the southeast limb
> late in the period. The associated active region is expected to
> rotate into view on 24 april. No other activity of note was
> observed.
>
> Solar activity forecast: solar activity is expected to be very
> low to low. A new region rotating on the east limb near S05 may
> slightly elevate activity levels over the next three days.
>
> The geomagnetic field was quiet to unsettled with isolated
> active
> conditions late in the period. A coronal hole high speed stream has
> rotated into a geoeffective position. Solar wind speed gradually
> increased to near 600 km/s. The imf bz was generally northward, but
> occasional brief southward excursions occurred late in the period.
>
> Geophysical activity forecast: the geomagnetic field is
> expected to be quiet to unsettled with isolated active periods on 24
> and 25 april. Predominantly quiet levels with isolated unsettled
> periods are expected on 26 april as the high speed stream rotates
> out of a geoeffective position.
>
> Event probabilities 24 apr-26 apr
>
> Class M 01/01/01
> Class X 01/01/01
> Proton 01/01/01
> PCAF green
>
> Geomagnetic activity probabilities 24 apr-26 apr
>
> A. Middle Latitudes
> Active 30/25/15
> Minor storm 15/10/05
> Major-severe storm 05/05/01
>
> B. High Latitudes
> Active 40/35/20
> Minor storm 20/15/05
> Major-severe storm 10/05/01
>
>
> ** End of Daily Report **
> _______________________________________________
73 & GUD DX,
Thomas F. Giella, KN4LF
Retired Space & Atmospheric Weather Forecaster
Plant City, FL, USA
Grid Square EL87WX
Lat & Long 27 58 33.6397 N 82 09 52.4052 W
kn4lf@arrl.net
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