Abstract. Ozone data derived from the Tropospheric Monitoring Instrument (TROPOMI) sensor on board Sentinel-5 Precursor satellite show exceptionally low total ozone columns in polar region of Northern Hemisphere (Arctic) spring 2020. Minimum column values around or below 220 Dobson units (DU) were seen over Arctic for 5 weeks March and early April Usually persistence such is only observed South...

We give some characterizations of the exponential distribution based on the distributional properties and the expected values of record values; the index of record values has the geometric distribution.