@Rishabh Sharma: Yes, I am interested in ions concentration. Thank you.

You can also get the O/N2 product from the new GOLD mission here: https://gold.cs.ucf.edu/data/search/

Thank you, sir, David R. Themens, for your answer. It is of great help to me.

You can use GUVI data from the link below

http://guvitimed.jhuapl.edu/data_on2_tec_info

You can use GUVI data from the link below

http://guvitimed.jhuapl.edu/data_products

Hope it helps

Thank you, Sheetal Karia, for your response. I got what I was exactly looking for.

You can use the NRLMSISE-00 Atmosphere Model from the link below:

https://ccmc.gsfc.nasa.gov/modelweb/models/nrlmsise00.php

Hope it can help you.

here it is a link

http:// guvitimed.jhuapl.edu/data_fetch_l3_on2_idlsave

http:// guvitimed.jhuapl.edu/data_fetch_l3_on2_idlsave

You must explore, access, and learn about data gathered by the NASA- EarthData using below link:

https://disc.gsfc.nasa.gov/

Good Luck!