Viewing archive of Monday, 18 September 2017

Solar activity report

Report of Solar-Geophysical Activity 2017 Sep 18 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 261 Issued at 2200Z on 18 Sep 2017

IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z

Solar activity has been at very low levels for the past 24 hours. There are currently 1 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low on days one, two, and three (19 Sep, 20 Sep, 21 Sep).
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
The geomagnetic field has been at quiet to minor storm levels for the past 24 hours. Solar wind speed reached a peak of 707 km/s at 18/1034Z. Total IMF reached 7 nT at 17/2101Z. The maximum southward component of Bz reached -5 nT at 18/0056Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 31067 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on days one and two (19 Sep, 20 Sep) and quiet to unsettled levels on day three (21 Sep).
III. Event Probabilities 19 Sep to 21 Sep
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       18 Sep 072
  Predicted   19 Sep-21 Sep 072/072/073
  90 Day Mean        18 Sep 081

V. Geomagnetic A Indices
  Observed Afr/Ap 17 Sep  013/016
  Estimated     Afr/Ap 18 Sep  019/024
  Predicted    Afr/Ap 19 Sep-21 Sep  012/014-011/012-007/008

VI. Geomagnetic Activity Probabilities 19 Sep to 21 Sep
A. Middle Latitudes
Active30%25%20%
Minor storm15%10%05%
Major-severe storm01%01%01%
B. High Latitudes
Active10%15%15%
Minor storm25%25%25%
Major-severe storm50%40%30%

<< Go to daily overview page

Latest news

Support SpaceWeatherLive.com!

A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!

100%

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/10/26Kp5 (G1)
Number of spotless days in 2019:245
Current stretch spotless days:18

This day in history*

Solar flares
12003M9.6
22003M5.8
31999M3.2
42012M1.7
52012M1.6
ApG
12003150G4
2200225G2
3200724G1
4199424G1
5200420
*since 1994

Social networks