Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from beak.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Sun, 21 Oct 1990 03:00:58 -0400 (EDT) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Sun, 21 Oct 1990 03:00:26 -0400 (EDT) Subject: SPACE Digest V12 #477 SPACE Digest Volume 12 : Issue 477 Today's Topics: MAJOR SOLAR FLARE ALERT Re: Theories needed on life Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription notices, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Date: Sun, 21 Oct 90 00:55:41 MDT From: std_oler%HG.ULeth.CA@ucnet.ucalgary.ca (Cary Oler) Subject: MAJOR SOLAR FLARE ALERT X-St-Vmsmail-To: ST%"space+@andrew.cmu.edu" -- MAJOR SOLAR FLARE ALERT -- OCTOBER 20, 1990 Potential Impact Forecast Flare Event Summary -------- MAJOR ENERGETIC EVENT SUMMARY A major solar flare occurred at 18:06 UT on 20 October. The flare was rated a class M8.5/1N event (quite powerful) and was produced from Region 6311 at location N15W82 (latitude, longitude from the central solar meridian). The flare officially began at 17:53 UT and ended at 18:12 UT (relatively short). The event was accompanied by strong radio bursts at high frequencies, but very weak bursts at low frequencies. A fairly weak shortwave fade was observed during this event. Post flare loops became visible at 18:41 UT and continued in progress for a couple of hours after the event. No further major flares are anticipated from Region 6311 before it passes beyond the western limb in 24 hours. However, there is a risk that this region will produce a low to moderate level M-class flare before it's passage beyond the western limb. Probabilities for flare activity over the next 72 hours (from 21 October to 23 October) are: Class M Flare: 45% Class X Flare: 05% Proton Flare: 05% POTENTIAL TERRESTRIAL IMPACT FORECAST The major flare is not expected to produce a terrestrial impact with the Earth. Although the flare was certainly powerful enough to cause a strong impact, it's position on the solar disk (far on the western limb) is too far to cause any significant impacts. However, although this major flare is not expected to have an impact with the Earth, another solar event very well could have a moderate impact with the earth. A large 30-degree long solar filament located between N48E01 and N32W23 disappeared sometime between 15:13 UT on 19 October and 00:58 UT on 20 October. This event is expected to produce an increase in both geomagnetic and auroral activity within the next 48 hours. Radio propagation conditions will likely also become somewhat degraded at that time. For more information regarding this event, see the Solar Terrestrial Forecast and Review for 20 October. ** End of Report ** ------------------------------ Date: 20 Oct 90 23:31:18 GMT From: maytag!watstat.waterloo.edu!dmurdoch@iuvax.cs.indiana.edu (Duncan Murdoch) Subject: Re: Theories needed on life In article <10168@ubc-cs.UUCP> mgobbi@cs.ubc.ca (Mike Gobbi) writes: > >A planet 3 or 4 times the size of earth? Do you mean 3xmass or 3xradius? > >In the latter case, we are talking about a 27-G planet! i think that the >only conceivable life forms on this planet would certainly be aquatic. That >way they are relatively immune to the effects of their mass. No, a planet with 3 times the Earth's radius, but the same density, would have just 3 times the gravitational force at the surface. The mass would by 27 times higher, but the inverse square law would reduce that because you'd be 3 times further from the centre. Duncan Murdoch ------------------------------ End of SPACE Digest V12 #477 *******************