Value chain · CLM-0169
In plain terms
The 2008 Japanese review that gives the well-known 32 and 425 watts-per-square-metre self-focusing thresholds only ever says self-focusing "might" happen at the lower frequency and is "thought" not to happen at the higher one - it never states either outcome as a settled fact.
The claim as recorded
Usui's (2008) own statements about thermal self-focusing outcomes at 2.45 GHz and 5.8 GHz are explicitly hedged in the original Japanese: "there is a possibility that the thermal self-focusing phenomenon occurs" (生じる可能性がある) for the 2.45 GHz case, and "it is thought that the thermal self-focusing phenomenon does not occur" (生じることはないと考えられる) for the 5.8 GHz case - neither is stated as an established fact.
Scope and limits
Concerns only the FORCE of Usui's own language, not the correctness of the underlying 32/425 W/m2 numbers (already recorded elsewhere) or of the formula used to derive them; the arithmetic independently reproduces Usui's stated values to within 0.1%. Only the confidence with which the paper asserts the physical outcome is in question here.
What it assumes
The literal translation given in the reviewing report accurately captures the hedging force of the Japanese grammatical constructions used (可能性がある = "there is a possibility," と考えられる = "it is thought/believed").
Where it comes from
Usui (2008), Section 2.2.1, p.2 (printed p.530): "熱的自己収束現象が生じる可能性がある" for 2.45 GHz; "熱的自己収束現象が生じることはないと考えられる" for 5.8 GHz; verified against rendered page images.
Basis: none
Related records
- Answers question
- QST-001 not published in this release
Cite this
energyaperture.com/c/clm-0169
CLM-0169, Energy Aperture, as of 2008.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-124
- CLM-0104A separate Japanese review worked out the same threshold from the original paper and got 32 and 425 watts per square metre. My own...CLM-0105A third party looked at the 230 watt per square metre design figure and said self-focusing may happen at 2.45 gigahertz but not at 5.8...CLM-0168In this 2008 Japanese review, the absorption figures of under 1% normally and up to about 10% at increased solar activity are not tied to...CLM-0500The same formula for how much microwave power a beam can carry before it destabilises the upper atmosphere gives 425 watts per square metre...