Value chain · CLM-0062
In plain terms
By 1981 the theory was being revised to a steeper frequency dependence, which would raise the permitted power density.
The claim as recorded
NASA RP-1076 records that the ionospheric heating theory was being revised in 1981 with initial results predicting a 1/f^3 rather than 1/f^2 frequency dependence, which would increase the power density limit, and notes that if the low-frequency to SPS-frequency scaling follows 1/f^3 and not 1/f^2 then the HF tests were conducted at a higher effective scale power flux than previously thought.
Scope and limits
Initial results of a revision in progress in 1981. Whether the revision was completed is not established by this document.
What it assumes
No assumptions are recorded against this claim.
Where it comes from
Verbatim, SRC-107: "The theory is now being revised, and initial results predict a l/f3 heating rather than l/f2, where f is frequency, which would increase the power density limit." And, verbatim: "If scaling from low frequency to the SPS frequency follows 1/f3 and not 1/f2, then these tests were actually conducted at a higher scale power flux than previously thought." (The printed exponents are superscripts; "l/f" in the transcription above is an OCR artefact for "1/f".)
Related records
- Answers question
- QST-009 not published in this release
- Contradicts
- CLM-0047 Heating falls with the square of frequency. In 2007 no ground-based measurement of it was...
Cite this
energyaperture.com/c/clm-0062
CLM-0062, Energy Aperture, as of 1981.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-107
- CLM-0033 (low confidence)Apart from a 1981 NASA review that found no evidence for the number and suggested a higher one, nobody was found to have revisited it, and...CLM-0060In 1981 a NASA review panel said the 230 watts per square metre figure rested on an obsolete theory with no experimental support, and made...CLM-0061The experiments were done. They found heating two or three times stronger than normal, not the tenfold effect predicted, no irregularities...CLM-0063NASA suggested in 1981 that 550 to 600 watts per square metre might be reasonable, roughly two and a half times the figure still in use...CLM-0101The 1978 contract required the researchers to report fixes if ionospheric disturbance pushed the pilot-beam phase error past 2 to 3...CLM-0160A 1978-81 NASA design study calculated that simply pointing the satellite's structure accurately enough, without any electronic correction...CLM-0420NASA's 1981 report says the experiments found nothing supporting the 23 milliwatt limit, that the measured heating was two or three times...CLM-0901Each antenna must hold its position along the line to the receiver within about three millimetres for a tenth of a decibel. The whole 1970s...More on the source page.
- Contradicted by
- CLM-0047Heating falls with the square of frequency. In 2007 no ground-based measurement of it was available at gigahertz frequencies, and...