Re: Sunspot Activity Radio Blackouts
--On Tuesday, July 23, 2002 10:11 PM -0700 Andy Ellifson [EMAIL PROTECTED] wrote: ( CORRECTED ) MAJOR SUNSPOT ACTITVITY I passed this on to a neighbor for comment wrt 802.11b. His response appears below: These blackouts generally affect communications in the HF (high frequency) range. This means that frequencies below about 30-40Mhz will be affected. The reason is that the F layers of the ionosphere are used to skip signals for long distance communications. The solar storms cause massive disturbances in the ionosphere which cause this skip effect to shut down. It is actually impressive to listen to by virtue of the total absence of normal noise, or any other signal, on these bands of frequencies. These frequencies are used, on occasion, for extremely low speed commercial/military digital communications (110 baud). This should have no effect on us. The R3 classification will shut down HF radio communications for a bit, but the G2 geomagnetic classification is not too bad and should not affect the power grids. Severe geomagnetic storms can shift the magnetic poles by many degrees. There are many places to get more information about sunspots. Being an amateur radio operator who likes HF communications, I have a bit of an interest in the topic. The most succinct monitoring and information site I have found is run by a group of short wave listeners in the Netherlands: http://www.dxlc.com/solar/ Many of the measurements used are taken in Boulder (Boulder K index). Nasa usually has some great photos of the big CMEs/Flares
Re: Sunspot Activity Radio Blackouts
Also check http://www.maj.com/sun/ for current solar info...nice site.. There are many places to get more information about sunspots. Being an amateur radio operator who likes HF communications, I have a bit of an interest in the topic. The most succinct monitoring and information site I have found is run by a group of short wave listeners in the Netherlands: http://www.dxlc.com/solar/ Many of the measurements used are taken in Boulder (Boulder K index). Nasa usually has some great photos of the big CMEs/Flares
Re: Sunspot Activity Radio Blackouts
Does anyone know of work done (from a network operations point of view rather than from a solar science point of view) that correlates errors on the copper part of networks, and/or machines in datacenters, with sunspot activity? scott On Tue, 23 Jul 2002, Andy Ellifson wrote: : : For anyone that operates a wireless network or a : copper based network: : : : Official Space Weather Advisory issued by NOAA Space : Environment Center : Boulder, Colorado, USA : : SPACE WEATHER ADVISORY BULLETIN #02- 2 : 2002 July 23 at 12:00 p.m. MDT (2002 July 23 1800 UTC) : : ( CORRECTED ) MAJOR SUNSPOT ACTITVITY : : A major sunspot region has rotated onto the visible : face of the sun. : This region, designated as Region 39 by NOAA Space : Environment Center : forecasters, is believed to have been the source of : three large coronal : mass ejections on the far side of the sun beginning on : July 16. This : region will rotate across the visible side of the sun : over the next two : weeks and is expected to produce more solar activity. : : Since appearing on the visible side yesterday (July : 22) this region has : already produced a major flare at 6:35 pm Mountain : Daylight Time (MDT) : on July 22 (0035, July 23 UTC). Radio blackouts : reached category R3 : (Strong) on the NOAA space weather scales. In : response to the major : flare, a geomagnetic storm is possible and is expected : to begin between : 8:00 pm MDT on July 23 and 8 am MDT on July 24 (0200 - : 1400, July 24 : UTC). The geomagnetic storm may reach category G2 : (moderate) levels on : the NOAA space weather scales. : : Category R3 radio blackouts result in widespread HF : radio communication : outages on the dayside of the Earth and can also : degrade low frequency : navigation signals. Category G2 geomagnetic storms : can lead to minor : problems with electrical power systems, spacecraft : operations, : communications systems, and some navigational systems. : Aurora : Borealis / Australis (northern / southern lights) may : be seen down into : the mid latitudes (New York, Madison, Boise, : Vladivostok, Rome, : Tasmania, Wellington - NZ, Puerto Montt - Chile) : : 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. For more : information, including email services, see SEC's Space : Weather : Advisories Web site http://sec.noaa.gov/advisories or : (303) 497-5127. : The NOAA Public Affairs contact is Barbara McGehan at : [EMAIL PROTECTED] or (303) 497-6288. : :
Sunspot Activity Radio Blackouts
For anyone that operates a wireless network or a copper based network: Official Space Weather Advisory issued by NOAA Space Environment Center Boulder, Colorado, USA SPACE WEATHER ADVISORY BULLETIN #02- 2 2002 July 23 at 12:00 p.m. MDT (2002 July 23 1800 UTC) ( CORRECTED ) MAJOR SUNSPOT ACTITVITY A major sunspot region has rotated onto the visible face of the sun. This region, designated as Region 39 by NOAA Space Environment Center forecasters, is believed to have been the source of three large coronal mass ejections on the far side of the sun beginning on July 16. This region will rotate across the visible side of the sun over the next two weeks and is expected to produce more solar activity. Since appearing on the visible side yesterday (July 22) this region has already produced a major flare at 6:35 pm Mountain Daylight Time (MDT) on July 22 (0035, July 23 UTC). Radio blackouts reached category R3 (Strong) on the NOAA space weather scales. In response to the major flare, a geomagnetic storm is possible and is expected to begin between 8:00 pm MDT on July 23 and 8 am MDT on July 24 (0200 - 1400, July 24 UTC). The geomagnetic storm may reach category G2 (moderate) levels on the NOAA space weather scales. Category R3 radio blackouts result in widespread HF radio communication outages on the dayside of the Earth and can also degrade low frequency navigation signals. Category G2 geomagnetic storms can lead to minor problems with electrical power systems, spacecraft operations, communications systems, and some navigational systems. Aurora Borealis / Australis (northern / southern lights) may be seen down into the mid latitudes (New York, Madison, Boise, Vladivostok, Rome, Tasmania, Wellington - NZ, Puerto Montt - Chile) 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. For more information, including email services, see SEC's Space Weather Advisories Web site http://sec.noaa.gov/advisories or (303) 497-5127. The NOAA Public Affairs contact is Barbara McGehan at [EMAIL PROTECTED] or (303) 497-6288.
