Space Weather Guide

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What is Space Weather?

Most of the time space, weather is of little concern in our everyday lives. However, when the space environment is disturbed by the variable output of particles and radiation from the Sun, technologies that we depend on in our daily life, in space orbit as well as on the ground, can be affected. Some of the most dramatic space weather effects occur in association with eruptions of material from the solar atmosphere into interplanetary space. Thus, our space weather is a consequence of the behavior of the Sun, the nature of Earth's magnetic field and atmosphere, and our location in the solar system. The increasing deployment of radiation -current- and field sensitive technological systems over the last few decades and the increasing presence of complex systems in space combine to make society more vulnerable to solar-terrestrial disturbances. This has been emphasized by the large number of problems associated with the severe magnetic storms between 1989 and 1991 as the 11 year solar activity cycle peaked.

SOHO Real-time View of the Sun

Space Weather Outlook

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast 29 April 2016

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast
SDF Number 120 Issued at 2200Z on 29 Apr 2016

IA. Analysis of Solar Active Regions and Activity from 28/2100Z to 29/2100Z: Solar activity has been at very low levels for the past 24 hours. There are currently 6 numbered sunspot regions on the disk.

IB. Solar Activity Forecast: Solar activity is expected to be very low with a chance for a C-class flares on days one, two, and three (30 Apr, 01 May, 02 May).

IIA. Geophysical Activity Summary 28/2100Z to 29/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 417 km/s at 29/0106Z. Total IMF reached 6 nT at 29/1917Z. The maximum southward component of Bz reached -2 nT at 29/1903Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 353 pfu.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to minor storm levels on day one (30 Apr), unsettled to active levels on day two (01 May) and quiet to unsettled levels on day three (02 May).

III. Event probabilities 30 Apr-02 May
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF green

IV. Penticton 10.7 cm Flux
Observed 29 Apr 092
Predicted 30 Apr-02 May 090/087/085
90 Day Mean 29 Apr 096

V. Geomagnetic A Indices
Observed Afr/Ap 28 Apr 006/005
Estimated Afr/Ap 29 Apr 003/005
Predicted Afr/Ap 30 Apr-02 May 018/025-017/020-009/010

VI. Geomagnetic Activity Probabilities 30 Apr-02 May
A. Middle Latitudes
Active 40/30/20
Minor Storm 15/15/05
Major-severe storm 01/01/01
B. High Latitudes
Active 10/15/15
Minor Storm 30/25/25
Major-severe storm 50/40/30


NOAA/SEC Satellite Environment

GOES X-Ray Flux

Dst Geomagnetic Index Estimate

Auroral Activity Extrapolated from NOAA POES


Dst > -20 nT


-20 nT > Dst > -50 nT


High: -50 nT > Dst > -100 nT


Dst < -100 nT


ACE Solar Wind Real-Time Data

Note: Images and text on this page are provided by NASA/ESA SOHO website. Space Weather Today from NOAA's Space Environment Center.