Michelson Interferometer for Passive Atmospheric Sounding (MIPAS)
The Michelson Interferometer for Passive Atmospheric Sounding
is one of the core experiments on ESA's Envisat satellite, launched on 1st
MIPAS measures atmospheric limb emission spectra from 685-2410 cm-1
(14.5 to 4.1µm) over a tangent altitude range 6-68 km.
After suitable ground processing, these spectra allow quantification of
concentration profiles of numerous atmospheric trace species. In addition,
atmospheric temperature as well as the distribution of aerosol particles,
tropospheric cirrus, and stratospheric ice clouds (including polar
stratospheric clouds) can also be derived from MIPAS data.
The objectives of MIPAS are:
Measurements of geophysical
parameters in the middle atmosphere; Stratospheric chemistry: O3, H2O,
CH4, N2O, NO2,
and HNO3; and Climatology: Temperature, CH4, N2O, O3 ;
Study of chemical composition, dynamics, and
radiation budget of the middle atmosphere;
Monitoring of stratospheric O3 and
As a unique feature of MIPAS, the atmospheric parameters
simultaneously as colocated profiles
with complete global coverage
during day- and nighttime conditions (allowing observations of the
diurnal variation of trace species), and
throughout its mission duration.
MIPAS Data: current status and coverage
MIPAS operated at full spectral resolution (0.025cm-1)
with a nominal 17 step scan pattern, giving 3km steps in
the lower atmosphere (now known as "FR17" mode).
MIPAS operated at reduced spectral resolution (0.0625cm-1)
but keeping the original scan pattern (3km steps).
ESA have also processed this data to L2.
Still at reduced spectral resolution (known as "Optimised Resolution")
but with a nominal scan pattern
consisting of 27 steps with 1.5km spacing in the lower atmosphere.
In practice, a significant amount of time is also spent in "UTLS1", "MA"
and "UA" modes with different altitude ranges and scan patterns
[List of new Modes].
The instrument originally (2005) operated on a 35% duty cycle but
since Dec 2007 has been operating full-time with a standard 10 day sequence of
8 days nominal mode, 1 day MA, 1 day UA.
ESA routinely produce L1B (spectra) and L2
(profiles) data, available
approximately 2 weeks after acquisition
Since Feb08 ESA have also been producing a Near Real Time (NRT) data,
available a few hours after acquisition.
Locations of the measurements that have been made are plotted on
"MIPAS L1B Data"
The Oxford L2 processor MORSE
is being used to process the complete MIPAS mission (original
ESA products plus additional molecules now also included in the ESA
retrievals: CFC-11, CFC-12, N2O5 and ClONO2),
including the NRT L1B data.
See "Oxford L2 Products" for current product
availability. The data are available from the
The current Oxford processor version is
v1.20 and all past data have been reprocessed