Helios number density structure observation times

<p>This record contains the dates, times and observing probe of number density structures observed by the two Helios spacecraft. Only structures observed at heliocentric distances less than 0.5 AU are listed.</p> <p>structure_times.csv contains following columns:</p> <p>Start: Start time of each observed structure (UT)<br> End : End time of each observed structure (UT)<br> Probe : Observing probe of each structure (1 for Helios 1, 2 for Helios 2)</p> <p>This is a supplement to &quot;<a href="https://doi.org/10.1051/0004-6361/201732567">Number density structures in the inner heliosphere</a>&quot;, published in Astronomy &amp; Astrophysics.</p>