Add MIGRAS products (NIX and TIX) (#126)

* Adding support for NIX and TIX products.

* Add mention to docs

---------

Co-authored-by: Martin Paces <[email protected]>

Author: smithara

docs/available_parameters.rst

@@ -113,6 +113,15 @@ MM_CON_SPH_2\_:crossover                        Conjunction information (times w
 MM_CON_SPH_2\_:plane_alignment                  Conjunction information (times when orbital planes align)
 ============================== ================ ===================================================================================================
 
+The `MIGRAS project (Monitoring of Ionospheric Gradients At Swarm) <https://earth.esa.int/eogateway/activities/migras>`_ contributes the `NEGIX <https://swarmhandbook.earth.esa.int/catalogue/SW_NIX_TMS_2F>`_ and `TEGIX <https://swarmhandbook.earth.esa.int/catalogue/SW_TIX_TMS_2F>`_ products:
+
+============================== ================
+Collection full name           Collection type
+============================== ================
+SW_OPER_NIX_TMS_2F             NIX_TMS
+SW_OPER_TIX_TMS_2F             TIX_TMS
+============================== ================
+
 The `TIRO project <https://earth.esa.int/eogateway/activities/tiro>`_ provides products for TEC and Ne derived from CHAMP, GRACE, and GRACE-FO:
 ============================== ================
 Collection full name           Collection type

src/viresclient/_client_swarm.py

@@ -216,6 +216,8 @@
     "WND_ACC_GRACE": ("https://swarmhandbook.earth.esa.int/catalogue/GR_WNDxACC_2_",),
     "WND_ACC_GFO": ("https://swarmhandbook.earth.esa.int/catalogue/GF_WNDxACC_2_",),
     "MM_CON_EPH_2_": ("https://swarmhandbook.earth.esa.int/catalogue/MM_CON_EPH_2_",),
+    "NIX_TMS": ("https://swarmhandbook.earth.esa.int/catalogue/SW_NIX_TMS_2F",),
+    "TIX_TMS": ("https://swarmhandbook.earth.esa.int/catalogue/SW_TIX_TMS_2F",),
     "TEC_TIRO": (
         "https://swarmhandbook.earth.esa.int/catalogue/CH_TEC_TMS_2F",
         "https://swarmhandbook.earth.esa.int/catalogue/GR_TECxTMS_2F",
@@ -669,6 +671,8 @@ class SwarmRequest(ClientRequest):
         # TOLEOS conjunctions
         "MM_CON_EPH_2_:crossover": ["MM_OPER_CON_EPH_2_:crossover"],
         "MM_CON_EPH_2_:plane_alignment": ["MM_OPER_CON_EPH_2_:plane_alignment"],
+        "NIX_TMS": ["SW_OPER_NIX_TMS_2F"],
+        "TIX_TMS": ["SW_OPER_TIX_TMS_2F"],
         # ULF and PC1 products
         "ULF_MAG": [f"SW_OPER_ULF{spacecraft}MAG_2F" for spacecraft in "ABC"],
         "ULF_MAG:event": [
@@ -773,6 +777,8 @@ class SwarmRequest(ClientRequest):
         "WND_ACC_GFO": "PT10S",
         "MM_CON_EPH_2_:crossover": "PT20M",
         "MM_CON_EPH_2_:plane_alignment": "P1D",
+        "NIX_TMS": "PT8S",
+        "TIX_TMS": "PT8S",
         "TEC_TIRO": "PT1S",  # Actually more complicated - non-unique samples
         "NE_TIRO": "PT5S",
         "ULF_MAG": "PT1M",
@@ -1339,6 +1345,40 @@ class SwarmRequest(ClientRequest):
             "satellite_1",
             "satellite_2",
         ],
+        "NIX_TMS": [
+            "Distance",
+            "Azimuth",
+            "Negix_X",
+            "Negix_X_Sigma",
+            "Negix_X_P95",
+            "Negix_Y",
+            "Negix_Y_Sigma",
+            "Negix_Y_P95",
+            "Negix_Total",
+            "Negix_Sigma",
+            "Negix_P95",
+            "N_Measurements",
+            "Flag_Negix",
+            "Orbit_Label",
+        ],
+        "TIX_TMS": [
+            "Longitude_Swarm",
+            "Latitude_Swarm",
+            "Distance",
+            "Azimuth",
+            "Tegix_X",
+            "Tegix_X_Sigma",
+            "Tegix_X_P95",
+            "Tegix_Y",
+            "Tegix_Y_Sigma",
+            "Tegix_Y_P95",
+            "Tegix_Total",
+            "Tegix_Sigma",
+            "Tegix_P95",
+            "N_Measurements",
+            "Flag_Tegix",
+            "Orbit_Label",
+        ],
         "ULF_MAG": [
             "Timestamp",
             "Latitude",