Release of extension of CHAOS-7 model based on Swarm data

An extension of CHAOS-7 model (version 7.8) has been released, determined by Chris Finlay (DTU), using Swarm official baseline 0601 data up to 30&nbsp;June 2021 and ground observatory data up to April 2021.

Compared to the original CHAOS-7 release (see Finlay et al., 2020), regularization has been adjusted: increased regularization parameter for CryoSat-2 sensitivities, upper degree for tapering for third&nbsp;time derivative regularization increased from degree 11 to 20, internal field regularization parameters reduced by a factor 0.66. &nbsp;&nbsp;

The model is available at the <a href="http://www.spacecenter.dk/files/magnetic-models/CHAOS-7/" target="_blank">DTU Space National Institute's CHAOS-7</a> page and on the&nbsp;<a href="https://swarm-diss.eo.esa.int/" target="_blank">Swarm dissemination server</a>&nbsp;at the following path:

<ul>
	<li>/Level2longterm/MCO with the file name: SW_OPER_MCO_SHA_2X_19970101T000000_20220101T115930_0708.ZIP</li>
</ul>

In this video, Tommaso Parrinello - Mission Manager of Aeolus and CryoSat - describes what is involved in managing the missions and the unique challenges offered by such innovative satellites.

CryoSat and Aeolus introduced by Tommaso Parrinello

Due to planned maintenance activities at Ifremer, the "SMOS Ocean Wind products" collection will not be regularly updated from 2023/03/29 at 4:00 UTC to 2023/03/30, until full operations resume.

SMOS - Planned maintenance on 29 March 2023

Environmental data disseminated by ESA’s Earth observation programmes provide knowledge about the stresses on Earth’s soils – aiding many applications such as crop management, drought and flood forecasting, and ecosystem protection.

Remote Sensing data underpin research on Soil

We are pleased to inform the CryoSat scientific community that the reprocessed CryoSat Ice Baseline-E data for all of 2012 and 2013 has been published on the Science Server and is now available for download.

New CryoSat Ice Baseline-E Reprocessed Data – Available now!

Additional EFI TII Raw And Corrected Imagery and Spectra (TRACIS) data is now available on the Swarm dissemination server for all the Swarm satellites.

Additional EFI TII Raw And Corrected Imagery and Spectra (TRACIS) dataset 0102 available for Swarm

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The Laser Retro-Reflector (LRR) is mounted on the Earth-facing panel of Envisat close to the RA-2 antenna to support satellite ranging for precise orbit determination and RA-2 range measurement calibration. Laser tracking provides the distance between the spacecraft and the station and is assimilated in precise orbit determination. It will be used extensively during the commissioning phase and regularly during the mission to verify the stability of the positioning system.

Laser Retro-Reflector consisting of four corner cubes mounted in a small pyramid on the underside of the spacecraft. They provide a means of tracking the GRACE satellites from the ground for backup and orbit verification.

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Precise orbit determination relies on the data from the GPS receivers providing full global coverage of orbit data. The alternative method of Satellite Laser Ranging (SLR) is used as a supporting and independent means for orbit determination. Its limitation is the rather poor global and temporal coverage, but the SLR data is free from ambiguities and directly related to the terrestrial reference frame.

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A spectrometer is a scientific instrument used to separate and measure spectral components of a physical phenomenon. Spectrometer is a broad term often used to describe instruments that measure a continuous variable of a phenomenon where the spectral components are somehow mixed. In visible light a spectrometer can for instance separate white light and measure individual narrow bands of colour, called a spectrum, while a mass spectrometer measures the spectrum of the masses of the atoms or molecules present in a gas. The first spectrometers were used to split light into an array of separate colours. Spectrometers were developed in early studies of physics, astronomy, and chemistry. The capability of spectroscopy to determine chemical composition drove its advancement and continues to be one of its primary uses. Spectrometers are used in astronomy to analyse the chemical composition of stars and planets, and spectrometers gather data on the origin of the universe. Hyperspectral radiometer—An advanced multispectral sensor that detects hundreds of very narrow spectral bands throughout the visible, near-infrared, and mid-infrared portions of the electromagnetic spectrum. This sensor’s very high spectral resolution facilitates fine discrimination between different targets based on their spectral response in each of the narrow bands. A device that is designed to detect, measure, and analyse the spectral content of incident electromagnetic radiation. Conventional imaging spectrometers use gratings or prisms to disperse the radiation for spectral discrimination.

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A technology demonstration that uses laser interferometry to measure fluctuations in the separation between the two GRACE spacecraft.

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ATMS

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The SSTI (Satellite to Satellite Tracking Instrument)is a state-of-the-art GPS receiver that has been designed to operate in a low-Earth orbit environment. The objective is to provide the SST-hl (Satellite-to-Satellite Tracking - high/low) contribution to the gravity field recovery, by the simultaneous tracking of up to 12 GPS satellite signals. In addition, SSTI provides data for precise orbit determination; it is also used for real-time on-board navigation and attitude-reference-frame determination. The SSTI instrument is based on the Lagrange architecture, a flight-proven device of Laben, Milan, Italy, a unit of Thales Alenia Space, Italy

SSTI

GAP (GPS Attitude and Positioning Experiment) instrument objective is to measure S/C velocity and attitude as well as TEC (Total Electron Content) of the ionosphere. The relative phase delay of signals in both the L1 and L2 bands from a GPS satellite occulted by the limb ionosphere provide large-scale (1000's of km) information on how the total electron content responds to magnetospheric perturbations. GAP consists of two components:
- GAP-A: Three single-frequency (L1) GPS receivers and four patch antennas. This package is being used to provide an accurate absolute time reference, spacecraft 3-D attitude, and post-processed spacecraft position and velocity.
- GAP-O: The objective is to provide ionospheric tomography observations.

Release of extension of CHAOS-7 model based on Swarm data

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