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This was the reply from the Department of Immigration Latvia.
As mentioned before: If you reside in Croatia as a researcher (you have a long-stay visa or a temporary residence permit issued by Croatia for that purpose) you can travel to Latvia and stay here until 180 days without visa in case when research work in Latvia is in the frame of the same project and you can documentary prove it.
Here is references to the corresponding legal acts:
“A researcher to whom a long-stay visa or a temporary residence permit has been issued in another Member State of the European Union
in relation to research is entitled to reside in the Republic of Latvia within the validity period of the aforementioned visa or temporary residence permit for the purpose of conducting the research work for a period of 180 days in any time period of 360 days.” (https://likumi.lv/ta/en/en/id/68522-immigration-law, Immigration Law, Section 5.2).
(Directive (EU) 2016/801 of the European Parliament and of the Council of 11 May 2016 on the conditions of entry and residence of
third-country nationals for the purposes of research, studies, training, voluntary service, pupil exchange schemes or educational projects and au pairing.
That means you do not have to apply for a visa (Schengen C visa) for travelling to Latvia when purpose of entry is the same research work as in Croatia.
Researchers don't neet visa to travel to Latvia for 180 days
Upvote:3
Latvia is a Schengen state and most Indian nationals require a Schengen visa to visit Latvia.The Latvian Embassy in New Delhi has a detailed webpage on short stay visas, also detailing document requirements here.
However, since you live in Croatia and Latvia does not maintain an embassy there, instead the Latvian embassy in Budapest covers covers Slovenia, Croatia and Montenegro. In this case, you may have to apply for a visa through another Schengen state that has a consular presence in Croatia.
I suggest you contact the Latvian embassy in Hungary by email or phone for details about your visa application.
Wish you good luck!