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 $<10\mathrm{eV}$ 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.

• Received 10 January 2024
• Accepted 15 April 2024

DOI:https://doi.org/10.1103/PhysRevD.109.103010

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Published by the American Physical Society