lunedì 1 maggio 2017

Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts
:Issued: 2017 May 01 0108 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/weekly.html
#
#                Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity 24 - 30 April 2017

Solar activity was at very low levels. The most significant event of
the period was observed early on 30 April at 0057 UTC when Region
2653 (S09, L=031, class/area, Hax/110 on 23 Apr) produced a
long-duration B3 flare with an associated slow-moving CME off the
WSW limb, first visible in LASCO C2 imagery at 30/0336 UTC. Analysis
and subsequent WSA-Enlil model output suggested a possible weak,
glancing blow at Earth beginning late on 03 May.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached
very high levels on 24-28 April and high levels on 29-30 April. A
maximum flux of 66,472 pfu was observed at 26/1735 UTC.

Geomagnetic field activity was at quiet to active levels on 24-25
April under the waning influence of a negative polarity CH HSS.
Predominately quiet levels were observed from 26-30 April.

FORECAST OF SOLAR AND GEOMAGNETIC ACTIVITY 01 MAY - 27 MAY 2017

Solar activity is expected to be very low with a slight chance for
C-class flare activity throughout the outlook period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
likely to reach high levels on 01-02, 04-06, 17-20 and 24-27 May
with very high levels likely on 21-23 May. Normal to moderate flux
levels are expected for the remainder of the period.

Geomagnetic field activity is likely to reach G2 (Moderate)
geomagnetic storm levels on 19-20 May with G1 (Minor) geomagnetic
storm levels likely on 17-18 May due to the influence of multiple,
recurrent CH HSSs. Active conditions are likely on 01, 16 and 21 May
due to CH HSS influence with additional active conditions possible
on 03-04 May due to CME effects. Quiet to unsettled levels are
expected for the remainder of the period.

:Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2017 May 01 0108 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/wwire.html
#
#      27-day Space Weather Outlook Table
#                Issued 2017-05-01
#
#   UTC      Radio Flux   Planetary   Largest
#  Date       10.7 cm      A Index    Kp Index
2017 May 01      77          12          4
2017 May 02      75           8          3
2017 May 03      75          12          4
2017 May 04      73          12          4
2017 May 05      75           8          3
2017 May 06      75           8          3
2017 May 07      75           5          2
2017 May 08      75           8          3
2017 May 09      75           5          2
2017 May 10      75           5          2
2017 May 11      75           5          2
2017 May 12      75           5          2
2017 May 13      75           5          2
2017 May 14      75           5          2
2017 May 15      80           8          3
2017 May 16      80          15          4
2017 May 17      80          30          5
2017 May 18      80          25          5
2017 May 19      85          45          6
2017 May 20      85          50          6
2017 May 21      85          15          4
2017 May 22      80          10          3
2017 May 23      80           8          3
2017 May 24      77           5          2
2017 May 25      77           5          2
2017 May 26      77           5          2
2017 May 27      77           5          2
(SWPC via DXLD)