Space Weather Advisories
Advisory Bulletins
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Space Weather Advisories Advisory Bulletins |
Space Weather Advisory Bulletins are issued when conditions occur that are thought to be of interest to the public.
SPACE WEATHER ADVISORY BULLETIN #04- 1
2004 July 26 at 01:17 p.m. MDT (2004 July 26 1917 UTC)
**** STRONG GEOMAGNETIC STORM EXPECTED ****
A large and moderately complex sunspot cluster known as NOAA Region 652 was responsible for a significant eruption on 25 July, 2004 at 915 a.m. MDT. A radiation storm, currently at the S2 level, began soon after the eruption was observed on the Sun. An Earth-directed coronal mass ejection (CME) was also observed and is expected to impact the geomagnetic field early on 27 July. This CME will likely produce periods of strong (G3) geomagnetic storming.Agencies impacted by geomagnetic storms and radiation storms may experience disruptions in the next 48 hours. These include spacecraft operations, electric power systems, HF communications, and navigation systems.
The Space Weather categories used in the Advisory products are explained at NOAA space weather scales.
Space Weather Advisory products are available here as soon as they are issued. They are also distributed via email. See Space Weather Advisories via email for instructions to subscribe to, or unsubscribe from, the email list.
Data used to provide space weather services are contributed by NOAA, USAF, NASA, NSF, USGS, the International Space Environment Services and other observatories, universities, and institutions.
Each type of advisory message has its own reference number; the last two digits of the current year and a sequential message number.
Dates and times are Mountain Daylight Time (MDT) or Mountain Standard Time (MST) followed by Coordinated Universal Time (UTC). The difference between Mountain and Universal times are MDT + 6 hours = UTC or MST + 7 hours = UTC.
More information is available at SEC's
Web site or (303) 497-5127.
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