lunedì 24 luglio 2017

Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts
:Issued: 2017 Jul 24 0308 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 17 - 23 July 2017

Solar activity was at low levels on 17-19 Jul and very low levels on
20-23 Jul. Region 2665 (S06, L=111, class/area Ekc/710 on 09 Jul)
produced the strongest flare of the period, a C2 flare observed at
19/0007 UTC from around the west limb. Region 2666 (N13, L=103,
class/area Cro/030 on 13 Jul) was mostly quiet as it decayed to
plage before rotating around the west limb. No Earth-directed CMEs
were observed in available coronagraph imagery.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
high levels throughout the summery period. A maximum flux of 13,630
pfu was observed at 19/1755 UTC.

Geomagnetic field activity ranged from quiet to G2 (Moderate)
geomagnetic storm levels throughout the reporting period. On 17 Jul,
the continuing influence of a CME caused quiet to active conditions
with an isolated period of G2 (Moderate) storm levels reported
during the 1500-1800 UTC synoptic period. Waning CME effects led to
quiet to unsettled conditions on 18 Jul. Conditions were quiet on 19
Jul through early on 20 Jul. Late on 20 Jul conditions reached
unsettled as a solar sector boundary crossing (SSBC) became
geoeffective. An isolated period of active was observed during the
0000-0300 UTC synoptic period on 21 July as total magnetic field
strength (Bt) increased to near 10 nT. Following the SSBC was a
co-rotating interaction region (CIR), causing solar wind speeds to
increase from around 450 km/s to a peak of 800 km/s observed at
21/1804 UTC. With the exception of G1 (Minor) geomagnetic storm
conditions observed during the 22/0900-1200 UTC synoptic period,
quiet to active conditions were observed through the remainder of
the period under the influence of positive polarity CH HSS.

FORECAST OF SOLAR AND GEOMAGNETIC ACTIVITY 24 JULY - 19 AUGUST 2017

Solar activity is expected to be low with a chance for M-class flare
activity (R1-R2/Minor-Moderate) on 30 Jul - 12 Aug due to the return
of old Region 2665 (S06, L=115) as it rotates through the visible
disk. Very low activity is expected for the remainder of the outlook
period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to range from normal to high levels. The influence of
recurrent, positive polarity CH HSSs are expected to cause high
levels from 24-29 Jul and again on 18-19 Aug. Moderate levels are
expected on 30-31 Jul and the remainder of the outlook period is
likely to be at normal levels.

Geomagnetic field activity is expected to range from quiet to G1
(Minor) geomagnetic storm levels. Quiet to G1 (Minor) storm levels
are likely on 05 Aug; quiet to active levels are likely on 24 Jul
and 17-18 Aug; quiet to unsettled levels are likely on 06-07 Aug and
19 Aug. All enhancements in geomagnetic activity are due to the
influence of multiple, recurrent, positive polarity CH HSSs. The
remainder of the outlook period is expected to be quiet under a
nominal solar wind regime.

:Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2017 Jul 24 0308 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 2017-07-24
#
#   UTC      Radio Flux   Planetary   Largest
#  Date       10.7 cm      A Index    Kp Index
2017 Jul 24      70           8          4
2017 Jul 25      70           5          2
2017 Jul 26      70           5          2
2017 Jul 27      70           5          2
2017 Jul 28      70           5          2
2017 Jul 29      70           5          2
2017 Jul 30      80           5          2
2017 Jul 31      82           5          2
2017 Aug 01      82           5          2
2017 Aug 02      82           5          2
2017 Aug 03      82           5          2
2017 Aug 04      82           5          2
2017 Aug 05      82          25          5
2017 Aug 06      82          10          3
2017 Aug 07      82           8          3
2017 Aug 08      82           5          2
2017 Aug 09      82           5          2
2017 Aug 10      82           5          2
2017 Aug 11      82           5          2
2017 Aug 12      80           5          2
2017 Aug 13      75           5          2
2017 Aug 14      70           5          2
2017 Aug 15      70           5          2
2017 Aug 16      70           5          2
2017 Aug 17      70          15          4
2017 Aug 18      70          15          4
2017 Aug 19      70          12          3
(SWPC via DXLD)