![]() |
|
![]() | ||
|
Subject:
lightning and two-way radios
Category: Science > Earth Sciences Asked by: lightningbrent-ga List Price: $2.00 |
Posted:
22 Jul 2004 08:58 PDT
Expires: 21 Aug 2004 08:58 PDT Question ID: 377633 |
I sent a question the other day - asking about any connection between radio transmission and lightning. Specifically, here at our wilderness program, there is a myth about "don't use the radio or phone during lightning drills", because it attracts lightning. I say it sounds ridiculous - that the radio transmitting has zero influence on lightning grounding at (my) particular spot. Can you prove me right? | |
| |
| |
|
![]() | ||
|
There is no answer at this time. |
![]() | ||
|
Subject:
Re: lightning and two-way radios
From: neilzero-ga on 22 Jul 2004 09:49 PDT |
$2 is probably not enough to attract a researcher. One way radios also attract lightning if they have an antenna that sticks up higher than the top of your head. Cellphones and portable phones usually have very short antennas and thus only increase your hazzard slightly. You are correct transmitting does not attract lightening, but all kinds of elevated electrical conductors do attract lightening so you should not be closer than about one meter from such a device or conductive structure when you hear thunder, even at a considerable distance. Lightening "Drill" suggests a fire drill. Did I change the meaning of your question by omitting the word "drill" ? Neil |
Subject:
Re: lightning and two-way radios
From: purkinje-ga on 22 Jul 2004 09:56 PDT |
I agree that it is not very likely that the radio will make any difference. The signal itself from the radio will make NO difference for sure, but as neilzero says, an elevated electrical circuit could make a differene. But if an electrical current can arc across thousands of feet of air, a little electrical circuit is going to make no difference. It's like people who believe that getting in a car during a lightning storm is safe because of the rubber tires. Well, if the lightning just jumped across 10 miles of non-conducting air, I think it could jump across 6 inches of rubber. The reason the car is safe is that the current can more easily pass through the metal of the car, thus bypassing the person sitting inside since they have a higher resistance. |
Subject:
Re: lightning and two-way radios
From: neilzero-ga on 22 Jul 2004 10:17 PDT |
Phone line networks sometimes cover a hundred square miles, so there is a slight chance the lightening will go to ground though you even thhough the network was hit a mile away. Some radio transmitters have antennas that reach more than 100 meters vertically, antennas are electrical conductors, so you are comparitively unsafe touching anything connected by wire to the transmitter. I agree the risk is likely lower by the minute than driving 5 miles per hour over the speed limit. Neil |
Subject:
Re: lightning and two-way radios
From: lightningbrent-ga on 22 Jul 2004 11:13 PDT |
Lightning Drill is getting the kids under tarps and on foam pads out in the Utah hills. I don't think it effects your answer. Thanks. I am under the belief that lightning moves both down from clouds but also up from the ground - the conducting antenna adds, perhaps, 4 inches of height - no significant difference. Thank you two for your answers. Re: $2 for researchers - you don't get it? You just being altruistic? |
Subject:
Re: lightning and two-way radios
From: omnivorous-ga on 22 Jul 2004 12:03 PDT |
LB -- The proscriptions against using a radio or telephone during electrical storms is probably more due to damage or personal injury than the "attraction" of lightning. With an active, open circuit on a radio, even stray branches of electricity from a nearby strike might damage the radio. With the swith "off" it's much more difficult for those stray branches to jump the gap of a switch. Similarly with the telephone system, though in this case it's the potential for a shock from a nearby strike carrying electricity to the handset. Best regards, Omnivorous-GA |
Subject:
Re: lightning and two-way radios
From: ulu-ga on 22 Jul 2004 22:19 PDT |
Ionizing radiation is likely to slightly increase the chance of lightning striking that location. I'm guessing the amount generated by hand-held devices is unlikely to be little more than a few inches difference. That technique (electrical or radioactive) is used by some lightning rods. Early streamer emission (ESE) lightning conductors http://www.lightningmaster.com/Early_Streamer-3.htm LIGHTNING FATALITIES, INJURIES, AND DAMAGE REPORTS IN THE UNITED STATES FROM 1959-1994 http://www.nssl.noaa.gov/papers/techmemos/NWS-SR-193/techmemo-sr193-11.html#table34 Locations and numbers of lightning casualties 26.8% Open field, ballparks, playgrounds, etc. 13.7% Under trees 8.1% Water related, fishing, boating, swimming, etc. 2.4% Telephone-related 0.7% Radios, transmitters, antennas, etc. (I would suspect that "Telephone-related" is for wired residential phones) http://www.lightningsafety.com/ http://www.lightningsafety.com/nlsi_pls/lst.html 2. IF OUTDOORS...Avoid water. Avoid the high ground. Avoid open spaces. Avoid all metal objects including electric wires, fences, machinery, motors, power tools, etc. Unsafe places include underneath canopies, small picnic or rain shelters, or near trees. Where possible, find shelter in a substantial building or in a fully enclosed metal vehicle such as a car, truck or a van with the windows completely shut. If lightning is striking nearby when you are outside, you should: A. Crouch down. Put feet together. Place hands over ears to minimize hearing damage from thunder. B. Avoid proximity (minimum of 15 ft.) to other people. |
Subject:
Random comments
From: ulu-ga on 24 Jul 2004 03:44 PDT |
Thanks Hedgie for the compliment. (Discussion about lightning drills) http://www.outdoored-lists.com/forums/messageview.cfm?catid=10&threadid=1211 Also, they probably want you to concentrate on the weather and situation. The radios/phones should probably be used for emergencies only during the drill. Something to keep in mind, metal objects are often melted from a lightning strike. Just to add some more controversy. (Looks like ESE's are hotly debated) The Straight Dope: Do lightning rods really work? http://www.straightdope.com/columns/010824.html Does a tongue piercing attract lightning? http://www.mythbustersfanclub.com/html/lightning_strikes_tongue_pierc.html If you are caught on a golf course during a storm and are afraid of lightning, hold up a 1-iron. Not even God can hit a 1-iron. - Lee Trevino Seriously, about 5% of the lightning deaths are golf related so the above is not recommended. Lightning does what it wants to do. That doesn't mean you shouldn't take precautions. HIKER STRUCK BY LIGHTNING MAKES PEACE WITH TRAGEDY http://groups.google.com/groups?selm=3275%40td2cad.intel.com |
Subject:
Re: lightning and two-way radios
From: omnivorous-ga on 24 Jul 2004 06:15 PDT |
> If you are caught on a golf course during a storm and are afraid of > lightning, hold up a 1-iron. Not even God can hit a 1-iron. > - Lee Trevino And, of course, the irony of Trevino's comment is that he's been struck by lightning twice, including 1975 during a major golf tournament, the Western Open: http://www.marginalrevolution.com/marginalrevolution/2004/02/facts_about_lig.html Best regards, Omnivorous-GA |
If you feel that you have found inappropriate content, please let us know by emailing us at answers-support@google.com with the question ID listed above. Thank you. |
Search Google Answers for |
Google Home - Answers FAQ - Terms of Service - Privacy Policy |