The most important factors for aurora viewing are the solar winds and geomagnetic field – so note the information above on those. It does not indicate whether the aurora borealis will appear. Planetary K-Index provides an estimate as to how wide the auroral oval may extend. Quiet to isolated active conditions are expected by midday on 22 Sep as a positive polarity CH HSS is anticipated to move into a geoeffective position. Geomagnetic Field: The geomagnetic field is expected to be at quiet to unsettled levels on 20 Sep, and mostly quiet on 21 Sep as negative polarity CH HSS influence diminishes. As a result, enhanced solar wind conditions are expected.
By midday on 22 Sep, a possible CIR is anticipated in advance of a large, equatorial CH HSS. Solar Winds: Background solar wind conditions are likely to return over 20-21 Sep. Twilight: Astronomical twilight will end at 10:38 p.m.
The moon could possibbly interfere with viewing a quiet aurora. TUE SEP 20 – Planetary K-Index : Kp1 WED SEP 21- Planetary K-Index : Kp1 THU SEP 22 – Planetary K-Index : Kp1Īdditional Information Affecting Aurora Viewing The Kp estimate is for the maximum level forecasted for the time between 10:00 p.m.
NORTHERN LIGHTS TONIGHT 2021 UPDATE
Keep an eye out for our daily weather forecast update below and tour status as noted on the Anchorage Aurora Quest page. The aurora forecast is updated for September 20.
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