Ausgestellt: 2019 Apr 24 0030 UTC
Erstellt von NOAA, Space Weather Prediction Center und verarbeitet SpaceWeatherLive.com
Solar activity was very low under a spotless solar disk. No
Earth-directed CMEs were observed in available satellite imagery.
Solar activity is expected to be very low for the forecast period (24-26
The greater than 2 MeV electron flux was at normal to moderate levels
and the greater than 10 MeV proton flux remained at background values.
The greater than 2 MeV electron flux is expected to be at normal to
moderate levels on 24-25 Apr, with a chance for high levels on 26 Apr,
due to CH HSS influences. The greater than 10 MeV proton flux is
expected to continue at background levels.
Solar wind parameters were indicative of a solar sector boundary
crossing. Parameters were at nominal levels until approximately 23/1500
UTC when total field and density started to increase. Total field rose
to a maximum of 11 nT at 23/2000 UTC while the Bz component deflected
southward to -9 nT. Solar wind speed remained at nominal levels in the
330-415 km/s range. Phi angle was mostly oriented in a positive (away)
solar sector until 23/1820 UTC when it switched into a negative
Late on 24 Apr to early on 25 Apr, a negative polarity CH HSS is
expected to enhance the solar wind. Solar wind speeds in the 500-600
km/s range is likely based on STEREO A data.
The geomagnetic field was quiet to unsettled.
Quiet to active conditions are expected on 24-25 Apr due to CIR effects
and associated CH HSS influence. Quiet to unsettled levels are expected
on 26 Apr, with a chance for an isolated active period, due to residual
CH HSS effects.