heliogram

n.

反光信号；

Exploiting Four Historical Ca II K Spectroheliogram Archives
Analysis of Ca II K spectroheliogram time-series for solar irradiance studies
Comparison Among Ca II K Spectroheliogram Time Series with an Application to Solar Activity Studies
On the experimental determination of the north direction of a heliogram
An intensity distribution of bright points observed on a CN spectroheliogram
On the potential value of Ca II K spectroheliogram time-series for solar activity and irradiance studies
Derivation of the parameters necessary to determine the north direction of a heliogram.
Solar Differential Rotation in Calcium II K Line Spectra Supported with Spectroheliogram Analysis
Die Archive solarer Integralaufnahmen und von Spektroheliogrammen des früheren Fraunhofer-Instituts (jetzt: Kiepenheuer-Institut f...
Die Archive solarer Integralaufnahmen und von Spektroheliogrammen des früheren Fraunhofer-Instituts (jetzt: Kiepenheuer-Institut f...