SETI中的间歇性信号和行星日
Intermittent Signals and Planetary Days in SETI
摘要：
星际信号可能由于许多原因而间歇，例如有针对性的顺序传输，或不连续的各向同性广播，或许多其他原因。这些信号之间的时间间隔将是重要的，因为搜索者需要观察足够长的时间才能实现初始检测，并可能确定一个周期。该条建议：（1）星际传输的功率需求可以通过导致间歇信号的策略减少几个数量级，（2）行星旋转可能会限制某些传输是间歇的，在某些情况下具有源行星的周期，（3）受行星旋转限制的信号通常可能具有10-25小时的节奏，如果我们把太阳系中的大多数行星作为指南的话。扩展观测可能需要检测间歇性信号，很少用于SETI，但可行，并且在观测大量恒星或跟踪良好的候选信号时似乎是合适的。
英文摘要：
Interstellar signals might be intermittent for many reasons, such as targeted sequential transmissions, or isotropic broadcasts that are not on continuously, or many other reasons. The time interval between such signals would be important, because searchers would need to observe for long enough to achieve an initial detection and possibly determine a period. This article suggests that: (1) the power requirements of interstellar transmissions could be reduced by orders of magnitude by strategies that would result in intermittent signals, and (2) planetary rotation might constrain some transmissions to be intermittent and in some cases to have the period of the source planet, and (3) signals constrained by planetary rotation might often have a cadence in the range of 10-25 hours, if the majority of planets in our solar system are taken as a guide. Extended observations might be needed to detect intermittent signals and are rarely used in SETI but are feasible, and seem appropriate when observing large concentrations of stars or following up on good candidate signals.
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