Goddard Point Multimédia 10790 - Satellites Voyager Trouver bulles magnétiques au bord du système solaire. The sun's magnetic field spins opposite directions on the north and south poles. These oppositely pointing magnetic fields are separated by a layer of current called the heliospheric current sheet. Due to the tilt of the magnetic axis in relation to the axis of rotation of the Sun, the heliospheric current sheet flaps like a flag in the wind. The flapping current sheet separates regions of oppositely pointing magnetic field, called sectors. As the solar wind speed decreases past the termination shock, the sectors squeeze together, bringing regions of opposite magnetic field closer to each other. The Voyager spacecraft have now found that when the separation of sectors becomes very small, the sectored magnetic field breaks up into a sea of nested "magnetic bubbles" in a phenomenon called magnetic reconnection.
This discovery has prompted a complete revision of what the heliosheath region looks like. For animations about the Voyager magnetic bubbles discovery, go here. L’activité solaire et ses manifestations. Sur le soleil, il se forme des taches, zones plus froides où le champ magnétique est très intense. Parfois, des éruptions solaires se produisent au niveau des taches et peuvent être accompagnées d’éjections de matière coronnale (CME en anglais), constituées de particules chargées.
Lorsque ces particules atteignent la terre, elles sont canalisées par le champ magnétique terrestre et pénètrent dans l’atmosphère par les pôles. Les particules entrent en collision avec les atomes de la haute atmosphère qui se retrouvent excités. Lorsqu’ils reviennent à leur état normal, ils émettent de la lumière, ce qui forme les aurores polaires. Taches solaires actuellement visibles source: SOHO (ESA & NASA) – instrument HMI Et pour le cas ou SOHO serait déffaillant,retenir l’image SDO Identification: Couronne solaire Cette image permet de voir les éjections de matière coronale, lorsqu’elles ont lieu. source: SOHO (ESA & NASA) – instrument LASCO C3 Rayonnement X du soleil Le vent solaire Activité géomagnétique.
NOAA 11442 - N12W15 (244 ", 306") - Beta. ARTIS @ SolarIMG. Mesures temps-réel de l'activité géomagnétique et des aurores. La mise à jour K7RA solaire. Solar Cycle 24 continues its upturn. We have a new high for the trailing three month daily sunspot number average. Starting with the three month period ending in December 2010 and going through November 2011, they were 30.1, 35.3, 55.7, 72.3, 74.4, 65.9, 61.5, 63, 79.6, 98.6 and 118.8. There hasn’t been a three month period with average daily sunspot numbers above 118.8 since way back in June, July and August 2003, when the average was 121.9. This was as Solar Cycle 23 was declining. The monthly averages of daily sunspot numbers for August-November 2011 were 66, 106.4, 123.6 and 133.1.
Sunspot numbers for November 24-30 were 139, 171, 133, 123, 90, 106 and 111, with a mean of 124.7. The latest forecast from NOAA/USAF has the solar flux on December 2 at 145, 140 on December 3-5, 135 on December 6-7, 140, 150, 150 and 155, on December 8-11, and 160 on December 12-18, and then 155 on December 19-22. Daily reports give us some insight into what caused a disturbance on November 30. Multimédia - Galerie Vidéo.
Les toutes dernières images de SOHO. Images solaires au CTAD. Click on any of the following thumbnail images for the most recent, full-resolution solar image of each type in the SDAC archive. The time and date of each image is below the image description. All times are in coordinated Universal Time (UTC). Images from the Solar Dynamics Observatory (SDO) Atmospheric Imaging Assembly (AIA) A Note on Color Tables The color tables used to display AIA images here are the ones used to display similar bandpasses for SOHO EIT and STEREO EUVI images. Color tables for the 94, 131, and 335 Å bandpasses are still under development. Images from the Solar Dynamics Observatory (SDO) Helioseismic and Magnetic Imager (HMI) Images from other sources Return to the home page for the SDAC. JSOC Dernières images. HMI-AIA JSOC la page principale. Imager héliosismique et magnétique pour SDO.