![]() A power level of 20 or more is usually adequate to produce auroras visible to the naked eye. The higher the number, the more charged particles are depositing in the upper atmosphere. This process transfers their kinetic energy to the upper atmosphere. It measures the rate of deposition of charged particles (mainly electrons and protons) into the atmosphere, where they collide with upper atmosphere particles and eventually stop. Hemispheric Power is a measure of auroral activity that helps determine how bright and active auroras might be. We do not provide the Kp level for a forecast period outside of nominal viewing times (i.e., local daytime). For the Kp index indicated in the Anchorage northern lights forecast, that is the maximum Kp predicted during the prime aurora viewing time in the Anchorage area (generally between 9:00 p.m. A fairly accurate Kp index can be determined up to 3-days in advance. Anchorage is within the Kp3 zone (aurora visible overhead), but auroras are often seen here on the horizon as low as Kp1 (except for the early and late season, where a higher Kp is needed due to bright twilight). The Planetary K-Index is measured on a scale of 0-9. 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. Pla netary K-Index provides an estimate as to how wide the auroral oval may extend. With the anticipated arrival of a fast wind associated with a coronal hole, there is a chance (35%) of active conditions and a slight chance (15%) of minor storm conditions. Geomagnetic Field: G1 (Minor) storms levels anticipated from the partial halo CME on 16 Apr. A negative polarity CH HSS is also expected to rotate into a geoeffective position late on 22 Apr with effects lasting through 23 Apr. This CME, which is travelling much slower than the background solar wind, is now forecast to arrive on 21 Apr. ![]() Solar Winds: There was little indication in solar wind data from the DSCOVR and ACE satellites that the partial halo CME from early on 16 Apr had arrived. Twilight: Astronomical twilight will start at 11:43 p.m. The moon will not interfere with viewing a quiet aurora. 22) as a 5.64% waxing crescent and be down all night. ![]() FRI APR 21 – Planetary K-Index : Kp 3.00 SAT APR 22 – Planetary K-Index : Kp 2.33 SUN APR 23 – Planetary K-Index : Kp 2.ooĪdditional Information Affecting Aurora Viewing The Kp estimate is for the maximum level forecasted for the time between 11:00 p.m. 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 April 21. If you can, get away from city lights and try to to get to a higher elevation for optimal viewing conditions.***Please Note: Our Anchorage Aurora Quest season ends today April 21, and will resume on August 17, 2023.*** You’ll want to look toward the northern horizon after 6pm on Saturday for the best viewing time. While the Northern Lights aren’t commonly seen in Colorado, they do happen from time to time. The G3 storm watch is in effect here on Earth both Saturday and Sunday. G1 storms are minor, while G5s are considered extreme. This current geomagnetic storm is rated a “G3,” which is the third level of National Oceanic and Atmospheric Administration’s five-level geomagnetic storm scale. The flare hit Earth 8.5min later, but the CME arrives tomorrow and will make spectacular auroras around the world! (green line= aurora visible on horizon) /S47Iw47aPf Well, that solar flare is strong enough to possibly send the Northern Lights far south into central areas of the United States.Ī massive Solar flare (photon burst) left the Sun this week and a Coronal Mass Ejection (CME: loads of plasma!) was released. The flare that occurred ended up being the second strongest flare up of the year. The sun has been making headlines lately due to a large solar flare that occurred back on Thursday. Digital Replica Edition Home Page Close Menu
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