Probing the dark matter velocity distribution via daily modulation

We consider dark matter velocity distributions with an anisotropic component, and analyze how the velocity structure can be probed in a solid-state ionization detector with no directional detection capability using a daily modulation effect due to the anisotropic response function of the target. We show that with an energy resolution of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mo><</a:mo><a:mn>10</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>eV</a:mi></a:math> it is possible to identify the presence of an anisotropic component consistent with observations for sub-GeV dark matter, and that introduction of daily modulation information substantially improves the sensitivity in a narrow mass range.