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- TL;DR Summary
- Fast radio bursts are rarely identified with galaxies and according to some hypotheses they may be a form of alien signals. I have found many similarities with pulse radar signals, but my knowledge in this area is not enough to draw any definite conclusions.
Both have short pulses of emission and a wide spectral bandwidth, covering a wide variety of frequencies:
"Fast Radio Bursts (FRBs) are detected over a wide range of radio frequencies, including frequencies around 1400 MHz, but have also been detected at lower frequencies, particularly in the 400–800 MHz range. Russian astronomers recently detected a powerful burst at 111 MHz, expanding our understanding of the FRB range.
Frequency Ranges:
1400 MHz:
Many of the known FRBs have been detected at these frequencies, making them one of the prime observing ranges.
400–800 MHz:
Some FRBs have been detected at lower frequencies, demonstrating that these phenomena are not limited to high frequencies.
111 MHz:
This is an example of an FRB being detected at an even lower frequency, indicating the diversity of sources and conditions that contribute to their occurrence."
According to one hypothesis, the bursts occur within our galaxy and may be artificially generated. In this case, their power will be much lower, and the pulses will probably be similar to radar pulses. Overall, this hypothesis is consistent with the data on fast radio bursts:
"Since the first FRB was detected in 2007, astronomers have catalogued more than 100 such events from distant sources scattered throughout the Universe, beyond our own Galaxy. Most of these events have been isolated. They last a short time and then disappear completely. In a few cases, astronomers have observed FRBs multiple times from the same source, but without any rhythm." https://indicator.ru/astronomy/obnaruzheny-povtoryayushiesya-bystrye-radiovspleski-18-06-2020.htm
The duration of radio bursts is approximately the same as that of radar pulses - thousandths of a second or less:
"Analyzing a 400-terabyte array of astronomical data that the Green Bank radio telescope (USA) has been collecting since 2017 for Yuri Milner's Breakthrough Listen project to search for extraterrestrial intelligent life, the researchers found several dozen fast radio pulses in it. Of this number, eight had a very short duration - only microseconds. The shortest of them lasted 6.5 microseconds, the longest - 86. Let us recall that a fast radio burst usually lasts at least a millisecond (there are 1000 microseconds in it)."
https://naked-science.ru/article/astronomy/astronomy-obnaruzhili-2
Radar pulses generally to be shorter radio burst pulses, but I found a natural explanation for this difference. It is known that when moving through the interstellar medium, radio pulses are stretched due to differences in the speed of high and low frequencies. Therefore, distant radar signals will seem longer than they actually are. Very short pulses will lose more peak power when stretched than longer ones, so they may be undetectable from large distances.
It seems that, at a superficial examination by a non-specialist, the hypothesis looks quite respectable. Perhaps there are some nuances of differences that are unknown to me.
"Fast Radio Bursts (FRBs) are detected over a wide range of radio frequencies, including frequencies around 1400 MHz, but have also been detected at lower frequencies, particularly in the 400–800 MHz range. Russian astronomers recently detected a powerful burst at 111 MHz, expanding our understanding of the FRB range.
Frequency Ranges:
1400 MHz:
Many of the known FRBs have been detected at these frequencies, making them one of the prime observing ranges.
400–800 MHz:
Some FRBs have been detected at lower frequencies, demonstrating that these phenomena are not limited to high frequencies.
111 MHz:
This is an example of an FRB being detected at an even lower frequency, indicating the diversity of sources and conditions that contribute to their occurrence."
According to one hypothesis, the bursts occur within our galaxy and may be artificially generated. In this case, their power will be much lower, and the pulses will probably be similar to radar pulses. Overall, this hypothesis is consistent with the data on fast radio bursts:
"Since the first FRB was detected in 2007, astronomers have catalogued more than 100 such events from distant sources scattered throughout the Universe, beyond our own Galaxy. Most of these events have been isolated. They last a short time and then disappear completely. In a few cases, astronomers have observed FRBs multiple times from the same source, but without any rhythm." https://indicator.ru/astronomy/obnaruzheny-povtoryayushiesya-bystrye-radiovspleski-18-06-2020.htm
The duration of radio bursts is approximately the same as that of radar pulses - thousandths of a second or less:
"Analyzing a 400-terabyte array of astronomical data that the Green Bank radio telescope (USA) has been collecting since 2017 for Yuri Milner's Breakthrough Listen project to search for extraterrestrial intelligent life, the researchers found several dozen fast radio pulses in it. Of this number, eight had a very short duration - only microseconds. The shortest of them lasted 6.5 microseconds, the longest - 86. Let us recall that a fast radio burst usually lasts at least a millisecond (there are 1000 microseconds in it)."
https://naked-science.ru/article/astronomy/astronomy-obnaruzhili-2
Radar pulses generally to be shorter radio burst pulses, but I found a natural explanation for this difference. It is known that when moving through the interstellar medium, radio pulses are stretched due to differences in the speed of high and low frequencies. Therefore, distant radar signals will seem longer than they actually are. Very short pulses will lose more peak power when stretched than longer ones, so they may be undetectable from large distances.
It seems that, at a superficial examination by a non-specialist, the hypothesis looks quite respectable. Perhaps there are some nuances of differences that are unknown to me.
