This page describes a video Under the Stars with Steve, by Sheila Wiwchar, Canada

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Caption: Third place in the 2021 IAU OAE Astrophotography Contest, category Aurorae (time-lapses).

This is a strange atmospheric phenomenon known as Steve. This is similar to an aurora as it is caused by charged particles interacting with the Earth's magnetic field. However unlike aurorae, the particles which cause Steve are generated high in the Earth's atmosphere rather than coming from the Sun. Note the banded "picket fence" appearance. This is caused by waves of these particles in the upper atmosphere. The name Steve was chosen by the first group to describe this phenomenon as a familiar name for something unknown.

Sheila Wiwchar/IAU OAE

Captions in other languages

Credit: Wiwchar, Sheila; IAU OAE
DOI: 10.5281/zenodo.5279746
Related glossary terms: Aurora , Aurora Borealis
Categories: Naked Eye Astronomy

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons

The media file captions presented on the OAE website were written, translated and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits for our translation project here. All media file captions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE". The media files themselves may have different licenses (see above) and should be credited as listed above under "credit".

Captions in Different Languages:

Caption: الصورة الفائزة بالمركز الثالث في مسابقة التصوير الفلكي التي اقامها مكتب تعليم الفلك التابع لاتحاد الفلك الدولي لعام 2021، فئة الشفق القطبي (الفواصل الزمنية).

ظاهرة ستيف او (تعزيز سرعة الانبعاثات الحرارية القوية) هي ظاهرة غريبة في الغلاف الجوي، تشبه الشفق القطبي لأنها ناتجة عن تفاعل الجسيمات المشحونة مع المجال المغناطيسي للأرض، الا انها عكس الشفق القطبي ، لان الجسيمات التي تسبب ظاهرة ستيف تتولد عالياً في الغلاف الجوي للأرض بدلاً من أن تأتي من الشمس. لاحظ مظهر او شكل "سياج الاعتصام" الدائري الموجود في الصورة. يحدث هذا بسبب موجات هذه الجسيمات في الغلاف الجوي العلوي. تم اختيار اسم ستيف من قبل محبي الشفق القطبي لوصف هذه الظاهرة على أنها اسم مألوف لشيء غير معروف.
Credit: حقوق الصورة تعود الى: شيلا وتشار/ مكتب تعليم الفلك، اتحاد الفلك الدولي
Related glossary terms: Aurora Borealis , الشفق القطبي
Caption translation status: Approved by a reviewer
Caption translators: Ali Al-Edhari
Caption reviewers: Ahmed Abulwfa

Caption: Troisième place au concours d'astrophotographie 2021 de l'UAI OAE, catégorie Aurores (images empilées).

Il s'agit d'un étrange phénomène atmosphérique connu sous le nom de Steve. Ce phénomène est similaire à une aurore puisqu'il est causé par des particules chargées qui interagissent avec le champ magnétique de la Terre. Toutefois, contrairement aux aurores, les particules à l'origine de Steve sont générées à haute altitude dans l'atmosphère terrestre et ne proviennent pas du Soleil. Notez l'aspect en bandes de l'image. Ce phénomène est causé par les ondes de ces particules dans la haute atmosphère. Le nom Steve correspond en fait l’acronyme anglais de Strong Thermal Emission Velocity Enhancement (forte augmentation de la vitesse d'émission thermique).

Sheila Wiwchar/IAU OAE
Credit: Wiwchar, Sheila ; AIU OAE
Related glossary terms: Aurora , Aurora Borealis
Caption translation status: Approved by a reviewer
Caption translators: Gilles Remy
Caption reviewers: Mamadou Mahamat Djabbi

Caption: Terzo posto al concorso di astrofotografia IAU OAE 2021, categoria Aurore (time-lapse).

Si tratta di uno strano fenomeno atmosferico noto come Steve. È simile a un'aurora perché è causato da particelle cariche che interagiscono con il campo magnetico terrestre. Tuttavia, a differenza delle aurore, le particelle che causano Steve sono generate in alto nell'atmosfera terrestre anziché provenire dal Sole. Si noti come il fenomeno abbia l'aspetto di uno steccato. Questo è causato dalle onde di queste particelle nell'alta atmosfera. Il nome Steve è stato scelto dal primo gruppo che descrisse questo fenomeno come un nome familiare per qualcosa di sconosciuto.

Sheila Wiwchar/IAU OAE
Credit: Wiwchar, Sheila; IAU OAE
Related glossary terms: Aurora , Aurora Boreale
Caption translation status: Approved by a reviewer
Caption translators: Giuliana Giobbi, Valentina La Parola
Caption reviewers: Rodolfo Canestrari