Answer
(Fatwa: 281/281/L=1431)
At the time of Kusoof (solar eclipse), two rak?at salah is Sunnah. It should be performed with jama?at. And it is sunnah to recite long surah such as Al-Baqarah etc with long rukoo and saj?dah, and the recitation should be slow.
وسن تطويلهما بنحو سورة البقره وسن تطويل ركوعهما و سجودهما (طحاوي)
و يخفى القراءة عند أبي حنيفة و عندهما بجهر و عن محمد كقول أبي حنيفة (كبيري)
After salah, the imam will perform dua while all the muqtadi will say Amen until the Kusoof comes to an end.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband