VLF Radio Astronomy: Research & Sources

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Research on VLF (very low frequency) radio astronomy indicates that observations require space-based telescopes due to atmospheric reflection of signals below 15 MHz. Challenges include the opacity of the interplanetary medium (IPM) and interstellar medium (ISM) to low-frequency radio waves. Several sources in space could potentially emit low-frequency radio waves, but significant obstacles remain in conducting such astronomy. Notable references include proposals and analyses on low-frequency radio interferometry and sensitivity studies for early reionization observatories. Overall, advancements in this field could enhance our understanding of cosmic phenomena.
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I'm not sure if this is a correct forum for this topic, but I'm wondering if there is any research done on VLF (very low frequency) radio astronomy. Obviously, such telescope would have to be in space, because all signals up to 15 MHz are reflected by the atmosphere.

If this was done or not, what would be possible sources in space of low frequency radio waves?
 
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There are several problems with doing astronomy at low frequencies, not the least of which is that the IPM (and, if we could get beyond the IPM, the ISM) is opaque to radio waves, below the plasma frequency.
http://rsd-www.nrl.navy.mil/7213/weiler/kwpdf/lfap-1page.pdf" gives a concise summary of one proposal.
 
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Nice reference, Nereid! Here are some others worth a look:

Combined LOPES and KASCADE-Grande Data Analysis
http://www.arxiv.org/abs/astro-ph/0510352

The Sensitivity of First Generation Epoch of Reionization Observatories and Their Potential for Differentiating Theoretical Power Spectra
http://www.arxiv.org/abs/astro-ph/0507357

Motivation and possibilities of affordable low-frequency radio interferometry in space
http://www.arxiv.org/abs/astro-ph/0207226
 
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