Articles tagged "ch hss"

probability of visible aurora mr 1110z f

G1 - Minor geomagnetic storm in progress

A negative polarity, southern crown coronal hole extension has moved into a geoeffective position enhancing the solar wind environment. Unsettled levels are expected on April 21 as high speed stream (HSS) effects persist. By late April 22 (UTC), a positive polarity...

April 20, 2020

aurora fcst g2 watch in effect sep 1 2019 f

Earth enters a stream of fast-moving solar wind, G2 - Moderate Geomagnetic Storm Watch in effect

Our planet has entered a stream of fast-moving solar wind flowing from a large positive polarity coronal hole. A G1 - Minor Geomagnetic Storm Watch is in effect for August 31 and G2 - Moderate for September 1. Solar wind parameters reflected a slow regime through...

August 31, 2019

aurora over alta norway by h j sperr february 27 2019

Negative polarity CH HSS sparks geomagnetic storming

An isolated, negative polarity Coronal Hole High Speed Stream (CH HSS) is affecting our planet on February 27 and 28, 2019, causing isolated periods of geomagnetic storming. Solar winds over the past 24 hours were indicative of an anticipated Solar Sector Boundary...

February 28, 2019

aurora january 5 2019 by adrien mauduit

Negative polarity CH HSS sparks G1 - Minor geomagnetic storming

A large negative polarity coronal hole is affecting our planet, causing G1 - Minor geomagnetic storming. Geomagnetic K-index of 5 (G1 - Minor geomagnetic storm) threshold was reached at 01:37 UTC, January 5, 2019. Solar wind parameters, as measured by the DSCOVR...

January 05, 2019

aurora forecast mr 1411z december 28 2018

Positive polarity coronal hole high speed stream sparks geomagnetic storm

A positive polarity coronal hole high speed stream (CH HSS) is affecting our planet since late December 27, sparking G1 - Minor geomagnetic storm. Periods of active conditions are likely through December 29 followed by quiet to unsettled activity on December 30...

December 28, 2018

polar connected ch december 5 2017 f

Polar-connected, positive polarity CH HSS sparks geomagnetic storming

A high-speed solar wind stream is affecting our planet today, causing geomagnetic storming. G2 - Moderate geomagnetic storm watch is in effect. Solar wind parameters indicated the onset of a Co-Rotating Interaction Region (CIR) in advance of a polar-connected,...

December 05, 2017

aurora jun wang october 11 2017

Spotless Sun, CH HSS sparks geomagnetic storms

Geomagnetic storming reaching G1 - Minor levels is underway as our planet moves through a stream of high-speed solar wind. At the same time, solar activity is at very low levels with no flare activity and a spotless Sun on its Earth-facing side. Over the past 24...

October 12, 2017

aurora forecast july 22 2017 at 08 46 utc

Positive polarity CH HSS sparks G1 geomagnetic storm

A positive polarity coronal hole high speed stream (CH HSS) is affecting our planet and will continue to do so over the next three days. Over the past 24 hours, by 12:30 UTC on July 22, solar wind parameters as measured by DSCOVR spacecraft reflected the influence...

July 22, 2017

probability_of_visible_aurora_obs_19 05_utc_2apr2016_f

Recurrent CH HSS causing geomagnetic storming on Earth

Our planet is passing through a stream of fast-moving, negative polarity solar wind. Geomagnetic storming reached G1 - Minor levels at 17:24 UTC. A G2 - Moderate warning is in effect for the rest of the UTC day. This is a recurrent CH HSS, responsible for G3 -...

April 02, 2016


Southern pole connected CH HSS causes unsettled to major geomagnetic storms

Southern pole connected coronal hole high speed stream (CH HSS) is causing unsettled to major (G2 - Moderate) geomagnetic storms since April 15, 2015.Geomagnetic K-index of 6 (G2 - Moderate) threshold was reached at 23:27 UTC on April 16, 2015.During the last 12 hours (

April 17, 2015


Earth under the influence of high speed solar wind stream

Earth is currently under the influence of a high speed solar wind stream originating in large southern coronal hole. Although the bulk of this stream is headed south of our planet, we have already experienced severe geomagnetic storm periods at high latitudes.Geomagneti

January 04, 2015


Impulsive M1.5 erupts off the east limb, Earth under the influence of CH HSS

An impulsive solar flare measuring M1.5 at its peak time erupted early on December 13, 2014, from a region rotating around the SE limb. The event started at 05:13, peaked at 05:20 and ended at 05:25 UTC.This new region shows a good potential for increased solar activity

December 13, 2014