AmateurRadio.com

Here is this week’s space weather and geophysical report, issued 2018 Apr 16 0126 UTC.

Highlights of Solar and Geomagnetic Activity 09 – 15 April 2018

Solar activity was at very low levels with a few isolated B-class flares observed.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at moderate levels on 09 Apr and high levels on 10-15 Apr. The largest flux of the period was 25,451 pfu observed at 12/2155 UTC.

Geomagnetic field activity was at quiet to active levels from 09-13 Apr due to negative polarity CH HSS effects. An isolated G1 (Minor) storm period was observed early on 11 Apr. Quiet conditions were observed on 14-15 Apr.

The period began with solar wind speeds at about 375 km/s, total field (Bt) at about 3 nT, Bz weakly negative to about -3 nT and the phi angle in a positive orientation. Early on the 9th, an SSBC from a positive to a negative orientation occurred coupled with a CIR in advance of a recurrent, negative polarity CH HSS. Winds speeds gradually increased in near 580 km/s by 11/0700 UTC, Bt peaked at 9 nT on the 11th and the Bz component was variable between +9 nT to -7nT early on 10 Apr. The period ended with wind speeds near 300 km/s coupled with a weak magnetic sturcture.

Forecast of Solar and Geomagnetic Activity 16 April – 12 May 2018

Solar activity is expected to be at very low levels throughout the period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to be high levels on 16-30 Apr and 07-12 May due to recurrent CH HSS effects. Normal to moderate levels are expected from 01-06 May.

Geomagnetic field activity is expected to be unsettled to active levels on 19-20 Apr and 06-10 May due to recurrent CH HSS effects. Mostly quiet levels are expected for the remainder of the outlook period.

Don’t forget to visit our live space weather and radio propagation web site, at: http://SunSpotWatch.com/

Live Aurora mapping is at http://aurora.sunspotwatch.com/

If you are on Twitter, please follow these two users: 1. https://Twitter.com/NW7US 2. https://Twitter.com/hfradiospacewx

Check out the stunning view of our Sun in action, as seen during the last five years with the Solar Dynamics Observatory (SDO): https://www.youtube.com/watch?v=zXN-MdoGM9g

= = = = =

BOOK SALE: Space Weather and Sun Science – get these from Amazon, and help us stay online!

NOTICE: When you buy this (or any item after starting with this link), you are helping us keep our SunSpotWatch.com and other resources “on the air” (up and running!). In other words, you are helping the entire community. So, check out this book:

Here is the link to Amazon: http://g.nw7us.us/fbssw-aSWSC

We’re on Facebook: http://NW7US.us/swhfr