"Rationale for METI"

My recent paper "Rationale for METI"

http://arxiv.org/abs/1105.0910

was adapted by H. Paul Shuch and placed at SETI League web site:

http://www.setileague.org/editor/meti_rat.htm

Classification of Interstellar Radio Messages

During the preparation and transmission of any interstellar radio messages (IRMs), some scientific and technological issues need to be addressed. The paper «Messaging to Extra-Terrestrial Intelligence» (METI) [1] lists nine of such issues. We propose to rank planned and already sent IRMs depending on how well three basic METI’s issues are resolved in them. These basic issues are the following: (1) choice of the target stars, (2) energy required per bit of the information, and (3) availability of a special digital or analog key to allow Aliens to decode our message, [2]. In order to rank IRMs, it is necessary to find out whether there are serious concerns regarding of how these three issues were addressed.

The corresponding analysis shows that to all three criteria mentioned above in the fullest measure satisfy five sent messages:
Arecibo Message 1974, http://en.wikipedia.org/wiki/Arecibo_message
Cosmic Call 1999, http://en.wikipedia.org/wiki/Cosmic_Call
Teen Age Message 2001, http://en.wikipedia.org/wiki/Teen_Age_Message
Cosmic Call 2003, http://www.cplire.ru/html/ra&sr/irm/CosmicCall-2003/index.html
A Message From Earth 2008, http://en.wikipedia.org/wiki/A_Message_From_Earth

All other IRMs cannot be considered as serious METI-projects. Without going into details and excluding all futile and advertising cases of broadcasts into Space (for example, advertising of beer, chips or the new popular scientific book), we end up with only a couple of examples. In the “Deep Space Communications Network” service, http://deepspacecom.net, radio messages are transmitting with no definite address, low power, and without any special encoding that would allow decoding of these messages at the receiving side. The message “Across the Universe” [3] was sent to the Pole star, a supergiant whose surroundings are not suitable for any life; besides the message was compressed by "terrestrial" algorithms and transmitted with inappropriately high speed. The list of other futile radio messages can be found in [4], and a short history of the interstellar radio messages is presented in [5].

Summarizing, we would like to notice that there is a clear and undoubted distinction between serious METI-projects and idle METI profanations. This allows avoiding discredits of the METI idea, which recently have developed into a new social phenomenon.

References

1. Alexander Zaitsev. Messaging to Extra-Terrestrial Intelligence, http://arxiv.org/abs/physics/0610031
2. John Walker. Self-Decoding Messages, http://www.fourmilab.ch/goldberg/setimsg.html
3. “NASA Beams Beatles' 'Across the Universe' Into Space”, http://www.nasa.gov/topics/universe/features/across_universe.html
4. “List of Interstellar Radio Messages”, http://en.wikipedia.org/wiki/List_of_interstellar_radio_messages
5. Michael Marshall. Earth Calling: A Short History of Radio Messages to ET, http://www.newscientist.com/article/dn18417-earth-calling-a-short-history-of-radio-messages-to-et.html

In 2008 NASA Beams Beatles' 'Across the Universe' Into Space, using 70-m dish of Deep Space Communication Network in Robledo, Spain,
http://www.nasa.gov/topics/universe/features/across_universe.html
In 2009 NASA plan to beam HELLO FROM EARTH message, using 70-m dish of Deep Space Communication Network in Canberra, Australia,
http://www.hellofromearth.net

Thus, in total we have now the following

List of Transmitted Interstellar Radio Messages:

#__Year____Name__________Antenna & Point

1) 1974, Arecibo Message, 300-m dish in Arecibo
2) 1999, Cosmic Call 1, 70-m dish in Evpatoria
3) 2001, Teen Age Message, 70-m dish in Evpatoria
4) 2003, Cosmic Call 2, 70-m dish in Evpatoria
5) 2008, Across the Universe, 70-m NASA dish in Robledo
6) 2008, A Message From Earth, 70-m dish in Evpatoria
7) 2009, Hello From Earth, 70-m NASA dish in Canberra (scheduled)

More info at Wiki Category Interstellar Messages

Isn't it time to create an International METI Institute?

I have suggested it in 2006: http://arxiv.org/abs/physics/0610031

Category: Interstellar Messages

I guess, there is very interesting new Wiki Category:

Category: Interstellar Messages

Paper "The first musical interstellar radio message"

My paper The first musical interstellar radio message

in Journal of Communications Technology and Electronics

September, 2008, pp. 1107-1113.

One numerical estimation

Let make only one numerical estimation:

1) T1 = The oxygen, essential life component, in the Earth's
atmosphere exists and therefore emits O2 spectral line at least 200 million years = 200,000,000 x 365 x 24 = 1.75 x 10**12 hours,
T2 = Total duration of all METI (Messaging to Extra-Terrestrial Intelligence, http://arxiv.org/abs/physics/0610031) transmissions from the Earth = 37 hours

Thus, L = T1 / T2 = 4.7 x 10**10

2) S1 = Solid angle of the O2 Earth's atmosphere radiation is all
celestial sphere, that is 4*Pi = 12.57 steradians,
S2 = Solid angle of METI transmission from the Earth is (wavelength /
dish's diameter)**2 = 10**(-6) steradians

Thus, M = S1 / S2 = 1.2 x 10**7,

and N = L x M = 5.9 x 10**17.

In other words, we can conclude that the probability to detect Earth's O2 spectral emission by a hostile super-civilization is N = L x M = 5.9 x 10**17 (!!!!) times higher than that of the METI transmissions.

I hope, none of us have doubt about ability of hostile super-civilization to detect remote planets and make spectroscopy of atmosphere of these remote planets...

Preface

I plan to place here my previous researches on METI subject from three my web pages:

http://www.cplire.ru/html/ra&sr/index.html
http://www.cplire.ru/rus/ra&sr/index.html
http://fire.relarn.ru/index.htm?main=126/activity.htm

as well as possible subsequent papers.