Mobile version

South Atlantic Anomaly as seen by Doris

Image of the Month - October 2007

Jason-1 exposure to South Atlantic Anomaly effects, measured on 200-2004 period using the Doris ultra-stable oscillator. (Credits Cnes/CLS)

The South Atlantic Anomaly is a phenomena that takes place in the ionosphere, at the magnetic equator, where the Van Allen radiation belt (particles emited by the Sun and trapped by the Earth magnetic field into a belt following the magnetic equator) is closest to Earth. This "anomaly" causes among other things errors on the measurement of the Doris instrument onboard Jason-1, since the orbit of this satellite is especially exposed. Using the Doris instrument onboard the other satellites, it is possible to study and measure this phenomena, in order to better correct from it.

The very high accuracy demanded to location by altimetry requests that every phenomena that can perturbate the instruments is taken into account. The T2L2 instrument that will be onboard Jason-2 should enable to measure this South Atlantic Anomaly, and its impact on the instruments.

See also:

Websites on this subject:

References:

  • Lemoine, J.M., H. Capdeville, A corrective model for Jason-1 Doris Doppler data in relation to the South Atlantic Anomaly, J. Geod., 80, 507-523, 2006
EnglishFrançais
Rss feedsContactPartnersFAQLexiconLegal noticePersonal Data Protection PolicyMobile
You must enable cookies in your browser preferences to save the modifications
You are using an older version of Internet Explorer, please update to take full advantage of Aviso+ features

Customize the home page

View all widgets
Reduce display
Public profile
User profile

Select/Deselect widgets

Discover AVISO+

Customizable home, reading tools, products search guide, etc.. Discover step by step the features of the new site AVISO+.

Customizable homepage

This home page is composed of blocks called "widgets".

Rearrange the blocks with a "Click & Drop".

Hide a widget with the cross at the top right. Reset or add a widget with the "wrench" icon. The "User" and "Public" profiles offer a predefined organization.

All the modifications are automatically saved as cookies on your machine so as to enable you to have your own specific AVISO+.

Reading tools

Ease your reading by choosing the page background colour (black/white) and/or by modifying the font size.

Browsing menu and breadcrum trail

To ease your browsing through AVISO+, you can use at any time the main banner items with the interactive submenus or use the browsing menu on the left side of the screen (it is open by default). For more readiness of the page contents, you can fold and unfold the browsing menu by clicking on the tab. At any time you can know where you are thanks to the browsing menu or the breadcrum at the top of the page.

Products search guide

The first submenu of the "Data" banner item leads you to a new search form enabling you to find quickier the product that suits your needs. The list of results is updated according to your selection criteria.

AVISO+ Multimedia

The first submenu of the "Multimedia" banner item leads you to AVISO+ collections of images and videos linked to altimetry and its applications. Have a nice visit!